简易计算器反编译

发布时间: 2022-11-03 21:26:49

A. 怎么用C++编译一个简单的计算器

我借鉴了别人的某计算器，因为你没有说多简易...我就找了个差不多的...
/*
程序名称:表达式计算器
编译环境:Microsoft Visual C++ 6.0
作者:吉林大学计算机科学与技术学院 2006 罗泗勇
时间:200801
*/

/*
说明:
采用树形结构处理表达式,按优先级运算结果,一个加,减,乘,除或数值为一个节点
优先级如下:
函数:4
括号:3
乘除:2
加减:1
*/

#include <windows.h>
#include <iostream>
#include <fstream>
#include <string>
#include <cmath>
using namespace std;

const char NUM[]={'0','1','2','3','4','5','6','7','8','9','.'};
const char OPERATION[]={'+','-','*','/'};
const double PI=3.14159265358979;
const double EE=2.71828182818281;

class Fun //处理系统数学函数的类
{
public:
Fun(string o,int t,double l=0.0,double r=0.0):op(o),type(t),lvalue(l),rvalue(r){}
static string FUN[];
double calc();
private:
int type; //666 0 1 sin90 2 3! 3 3C2
string op; //函数类型
double lvalue; //函数左边的值
double rvalue; //函数右边的值
static int FunNum;
};

int Fun::FunNum=8;
string Fun::FUN[]={"!","sin","cos","tan","log","ln","C","A","^"};
/*
函数说明:
1:log是以10为底的工程对数
2:ln 是以e为底的自然对数
3:C 计算组合数输入规则如计算 3取2的组合输入表达式 3C2
4:A 计算排列数输入规则如计算 3取2的排列输入表达式 3A2
5:! 计算阶乘
6:^ x的y次方输入 x^y
*/

int factorial(int n) //阶乘函数
{
int i,s=1;
for(i=1;i<=n;i++)
s*=i;
return s;
}

int C(int a,int b)
{
return factorial(a)/(factorial(b)*factorial(a-b));
}

int A(int a,int b)
{
return factorial(a)/factorial(b);
}

double Fun::calc() //计算系统函数的值
{
if(type==0)
return lvalue;
else
{
if(op=="!")
return factorial(lvalue);
if(op=="sin")
return sin(rvalue/180*PI);
if(op=="cos")
return cos(rvalue/180*PI);
if(op=="tan")
return tan(rvalue/180*PI);
if(op=="log")
return log10(rvalue);
if(op=="ln")
return log10(rvalue)/log10(EE);
if(op=="C")
return C(lvalue,rvalue);
if(op=="A")
return A(lvalue,rvalue);
if(op=="^")
return pow(lvalue,rvalue);
else
{
string err="暂时没有函数"+op;
MessageBox(NULL,err.c_str(),"错误",MB_OK);
return 0;
}
}
}

struct Unit //双向链表保存运算单元
{
Unit(int p,char o,string c,double v,int t,Unit * pr=NULL,Unit * n=NULL)
:PRI(p),Operation(o),Code(c),value(v),Type(t),Pre(pr),Next(n){}
int PRI; //优先级

char Operation; //操作符
string Code; //原始代码
double value; //数据

int Type; //类型操作符0 数据1 函数2
Unit * Pre; //构成双向链表
Unit * Next;
};

class Node //表达式树状结构的节点
{
public:
Node(char o,int p,int e=1,double v=0,Node * ph=NULL,Node * pl=NULL,Node * pr=NULL)
:Operation(o),PRI(p),Expression(e),value(v),Head(ph),Left(pl),Right(pr){}
Node * Head; //节点的根,左树枝,右树枝
Node * Left;
Node * Right;
double GetValue();
char GetOperation() const {return Operation;}
int GetPri() const {return PRI;}
int IsExp() const {return Expression;}
private:
char Operation; //操作符
int PRI; //优先级
int Expression; //记录该节点是否是表达式0 1
double value; //该节点的值
};

double Node::GetValue() //运算该节点的值
{
if(IsExp()) //该节点的值还未算出来
{
double lvalue,rvalue;
lvalue=Left->GetValue();
rvalue=Right->GetValue();
Expression=0;
char op=GetOperation();
switch(op)
{
case '+':
return lvalue+rvalue;
case '-':
return lvalue-rvalue;
case '*':
return lvalue*rvalue;
case '/':
return lvalue/rvalue;
default:
return 0;
}
}
else
return value;
}

bool Isnum(char c)
{
for(int i=0;i<sizeof(NUM);i++)
{
if(c==NUM[i])
return true;
}
return false;
}

bool Isoperation(char c)
{
for(int i=0;i<sizeof(OPERATION);i++)
{
if(c==OPERATION[i])
return true;
}
return false;
}

Unit * Analyse(string exp) //分析表达式并生成链表
{
int pri=0; //当前优先级
int stat=-1; //当前的读入状态括号 0 数据 1 运算符 2
Unit * head=NULL,* p=NULL;
int i=0,explen;
explen=exp.size();
for(i=0;i<explen;i++)
{
char c=exp.at(i);
if(c=='(')
{
pri+=3;
stat=0;
}
else if(c==')')
{
pri-=3;
stat=0;
}
else if(Isoperation(c)) //操作符不会出现在表达式开头
{
Unit * temp=p;
int add_pri; //自身增加的优先级
if(c=='+' || c=='-')
add_pri=1;
else
add_pri=2;
p->Next=new Unit(pri+add_pri,c," ",0,0);
p=p->Next;
p->Pre=temp;
}
else //其他的当做函数处理
{
string function="";
while(i<explen && (c=exp.at(i),! Isoperation(c)) && c!=')')
{
function+=c;
i++;
}
i--;

if(head==NULL)
{
p=new Unit(pri,' ',function,0,2);
head=p;
}
else
{
Unit * temp=p;
p->Next=new Unit(pri,' ',function,0,2);
p=p->Next;
p->Pre=temp;
}
}
}
return head;
}

Unit * Calc(Unit * head) //计算双向链表基本单元的值
{
Unit * p=head;
while(p!=NULL)
{
if(p->Type!=0) //非操作符
{
string temp=p->Code;
string op;
double lvalue=0,rvalue=0;
int l_point=0,r_point=0;
int i=0,type=0;
char ch;
while(i<temp.size() && (ch=temp.at(i),Isnum(ch)))
{
if(ch=='.')
{
l_point++;
i++;
continue;
}
if(! l_point)
lvalue*=10;
lvalue+=(ch-'0')*pow(10,-l_point);
i++;
if(l_point)
l_point++;
}
while(i<temp.size() && (ch=temp.at(i),! Isnum(ch)))
{
op+=ch;
type=1;
i++;
}
while(i<temp.size() && (ch=temp.at(i),Isnum(ch)))
{
if(ch=='.')
{
r_point++;
i++;
continue;
}
if(! r_point)
rvalue*=10;
rvalue+=(ch-'0')*pow(10,-r_point);
i++;
if(r_point)
r_point++;
}
Fun * f=new Fun(op,type,lvalue,rvalue);
p->value=f->calc();
}
p=p->Next;
}
return head;
}

Node * Tree(Unit * head) //生成表达式树
{
Node * root=NULL,* proot=NULL,* pbranch=NULL;
Unit * p=head;
int now_pri; //当前优先级
bool hadop=false;
while(p!=NULL)
{
if(p->Type==0) //如果是一个操作符
{
hadop=true;
if(root==NULL)
{
proot=new Node(p->Operation,p->PRI,1);
root=proot;
pbranch=root;
now_pri=p->PRI;
proot->Left=new Node(' ',0,0,p->Pre->value);
proot->Right=new Node(' ',0,0,p->Next->value);
}
else
{
if(p->PRI<=now_pri) //优先级低于当前优先级,树根方向 //最初写的 if(p->PRI<now_pri),9/3/3=9,错的
{
proot=new Node(p->Operation,p->PRI,1); //新的树根
proot->Left=root; //根的变换
proot->Right=new Node(' ',0,0,p->Next->value);
root=proot;

pbranch=proot; //右树枝的变换
//pbranch->Right=new Node(' ',0,0,p->Pre->value); //树枝右边取值
}
else
{
Node * temp;
temp=new Node(p->Operation,p->PRI,1);

pbranch->Right=temp;
temp->Head=pbranch;

pbranch=pbranch->Right;
pbranch->Left=new Node(' ',0,0,p->Pre->value);
pbranch->Right=new Node(' ',0,0,p->Next->value);
}
now_pri=p->PRI;
}
}
p=p->Next;
}
if(! hadop)
root=new Node(' ',0,0,head->value);
return root;
}

int main()
{
string exp;

//ifstream infile("test.txt",ios::in);
while(! getline(cin,exp).eof())
{
if(exp=="")
continue;
Unit * h=Analyse(exp);
h=Calc(h);
Node * root=Tree(h);
cout<<exp<<"="<<root->GetValue()<<endl;
}
return 0;
}

B. HELP！DEV-C++反编译人品计算器！

editable=ture??? 你写错了吧？应该是 editable=true;

C. 用javaScript做一个简易的计算器

我刚学javaScript做一计算器，请看看！多多交流！~~``

<html>
<head>
<title>计算器</title>
</head>
<body bgcolor="#33FF99" onload="FKeyPad.ReadOut.focus();FKeyPad.ReadOut.select();">
<FORM name="Keypad" action="">
<TABLE align="center">
<B>
<TABLE align="center" border=3 width=60 height=80 cellpadding=2 cellspacing=5 borderlight="#008080">
<tr align="center">
<td bordercolor="#FF33CC" bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933" colspan=10 align=center>网页计算器</td>
</tr>
<tr align="center">
<td bordercolor="#FF33CC" bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933" colspan=10 align=right><input name="ReadOut" type="Text" onkeypress="CheckOut()" size=40 value="0"
width=100%></td>
</tr>
<tr align="center">
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnsin" type="Button" value=" sin " onclick="useFun ('sin')"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btncos" type="Button" value=" cos " onclick="useFun ('cos')"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnOne" type="Button" value=" 1 " onclick="NumPressed(1)"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnTwo" type="Button" value=" 2 " onclick="NumPressed(2)"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnThree" type="Button" value=" 3 " onclick="NumPressed(3)"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnPlus" type="Button" value=" + " onclick="Operation('+')"> </td>
</tr>
<tr align="center">
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnasin" type="Button" value=" asin " onclick="useFun ('asin')"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnacos" type="Button" value=" acos " onclick="useFun ('acos')"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnFour" type="Button" value=" 4 " onclick="NumPressed(4)"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnFive" type="Button" value=" 5 " onclick="NumPressed(5)"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnSix" type="Button" value=" 6 " onclick="NumPressed(6)"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnMinus" type="Button" value=" - " onclick="Operation('-')"></td>
</tr>
<tr align="center">
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btntan" type="Button" value=" tan " onclick="useFun ('tan')"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnatan" type="Button" value=" atan " onclick="useFun ('atan')"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnSeven" type="Button" value=" 7 " onclick="NumPressed(7)"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnEight" type="Button" value=" 8 " onclick="NumPressed(8)"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnNine" type="Button" value=" 9 " onclick="NumPressed(9)"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnMultiply" type="Button" value=" * " onclick="Operation('*')"></td>
</tr>
<tr align="center">
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnlog" type="Button" value=" log " onclick="useFun ('log')"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnexp" type="Button" value=" exp " onclick="useFun ('exp')"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnZero" type="Button" value=" 0 " onclick="NumPressed(0)"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnDecimal" type="Button" value=" . " onclick="Decimal()"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnNeg" type="Button" value=" +/- " onclick="Neg()"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnDivide" type="Button" value=" / " onclick="Operation('/')"></td>
</tr>
<tr align="center">
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnsqrt" type="Button" value=" sqrt " onclick="useFun ('sqrt')"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnOx" type="Button" value=" 1/x " onclick="useFun ('1/x')"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnXt" type="Button" value=" x^2 " onclick="useFun ('x^2')"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnXthr" type="Button" value=" x^3 " onclick="useFun ('x^3')"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnpi" type="Button" value=" pi " onclick=FKeyPad.ReadOut.value=Math.PI></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnEquals" type="Button" value=" = " onclick="Operation('=')"></td>
</tr>
<tr align="center">
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnDivide" type="Button" value=" N! " onclick="ni ()"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnDivide" type="Button" value=" pow " onclick="Operation('pow')"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnDivide" type="Button" value=" E " onclick=FKeyPad.ReadOut.value=Math.E></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnClear" type="Button" value=" C " onclick="Clear()"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnClearEntry" type="Button" value=" CE " onclick="ClearEntry()"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnReturn" type="Button" value="返回" onclick="goReturn()"></td>
</tr>
<tr align="center">
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnmod" type="Button" value=" MOD " onclick="Operation('MOD')"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnDivide" type="Button" value=" INT" onclick=FKeyPad.ReadOut.value=parseInt(FKeyPad.ReadOut.value,10)></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnmod" type="Button" value=" HEX " onclick="hexchange ()"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnmod" type="Button" value=" OCT " onclick="octchange ()"></td>
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnmod" type="Button" value=" BIN " onclick="binchange ()"></td>
</tr>
</TABLE>
</TABLE>
</B>
</FORM>
</CENTER>
<font face="Verdana, Arial, Helvetica" size=2>
<SCRIPT LANGUAGE="JavaScript">

</SCRIPT>
</body>
</html>

D. c语言TC版，简易计算器，行数不太够，高手帮改下。

想不到还有要求程序行数越多越好的
我看这老师标准有问题，或者你误解了老师的意思。
老师是希望你的程序功能达到一定的规模，而不是同样的功能要扩充代码量。
同样的功能，写代码量越少越好，写得少错得少
能不写代码就实现功能更好。
你误解了高手的标准。
其实把代码写少是最难的，
比如你写一百个功能，如果80行就写出来了，那就是真正的牛人了。

E. MFC编写计算器具体步骤方法代码，拜托高手急用！

1、首先打开VS2013，新建一个VC++ MFC项目，命名为 gongzi。

F. 简易计算器代码

http://post..com/f?kz=209715785 我的计算器 Option Explicit Dim FocusText As VB.TextBox Dim pd As Boolean Dim x As Double Dim y As Double Dim ch As Integer Private Sub Command1_Click(Index As Integer) On Error Resume Next FocusText.SetFocus If Index SendKeys Index ElseIf Index = 10 Then ch = Index - 10 x = Val(Text1.Text) Text1.Text = "" ElseIf Index = 14 Then y = Val(Text1.Text) Select Case ch Case 0 Text1.Text = x + y Case 1 Text1.Text = x - y Case 2 Text1.Text = x * y Case 3 Text1.Text = x / y End Select ElseIf Index = 15 Then FocusText.SetFocus SendKeys "{BS}" ElseIf Index = 16 Then FocusText.SetFocus SendKeys "." End If End Sub '防止输入多个小数点以及出数字外的其他字符 Private Sub Text1_KeyPress(KeyAscii As Integer) If (KeyAscii 57) And KeyAscii 46 And KeyAscii 8 Then KeyAscii = 0 End If If pd = True And KeyAscii = 46 Then KeyAscii = 0 End If If pd = False And KeyAscii = 46 Then pd = True KeyAscii = 46 End If End Sub '防止 Ctrl + v 粘贴 Private Sub Text1_KeyDown(KeyCode As Integer, Shift As Integer) If KeyCode = vbKeyV And Shift = vbCtrlMask Then Text1.Enabled = False Clipboard.Clear Text1.Enabled = True End If End Sub '防止右键粘贴 Private Sub Text1_MouseDown(Button As Integer, Shift As Integer, x As Single, y As Single) If Button = vbRightButton Then Text1.Enabled = False Clipboard.Clear Text1.Enabled = True End If End Sub Private Sub Text1_LostFocus() Set FocusText = Text1 End Sub 界面如下 0为Command1（0）1为Command1（1）依次类推 ←为Command1(15) 小数点为Command1(16) 贴子相关图片: 界面可以到

G. c语言设计一个简单的计算器程序

＃include＜stdio．h＞／／计算器

voidmenu（）／／自定义的菜单界面

｛

printf（＂－－－－－－－－－－－－－－－－－－－－＼n＂）；

printf（＂请输入你的选择＼n＂）；

printf（＂1．＋＼n＂）；

printf（＂2．－＼n＂）；

printf（＂3．＊＼n＂）；

printf（＂4．／＼n＂）；

printf（＂－－－－－－－－－－－－－－－－－－－－＼n＂）；

｝

intmain（）

｛

inti＝0；

intj＝0；

intnum＝0；／／计算结果存放在nun

intselect＝0；／／选择的选项存放在select

do／／do－while先执行再判断循环条件，即可实现重复计算功能

｛

menu（）；／／打印出菜单界面

scanf（＂％d＂，＆select）；／／输入你的选项

printf（＂请输入计算值：＂）；

scanf（＂％d％d＂，＆i，＆j）；／／输入要计算的数值

switch（select）

｛

case1：

printf（＂％d＋％d＝％d＼n＂，i，j，num＝i＋j）；／／实现加法功能

break；

case2：

printf（＂％d－％d＝％d＼n＂，i，j，num＝i－j）；／／实现减法功能

break；

case3：

printf（＂％d＊％d＝％d＼n＂，i，j，num＝i＊j）；／／实现乘法功能

break；

case4：

printf（＂％d－％d＝％d＼n＂，i，j，num＝i／j）；／／实现除法功能

break；

default：

printf（＂输入有误重新选择＂）；

break；

｝

｝while（select）；

return0；

｝

运行结果：

(7)简易计算器反编译扩展阅读：

return表示把程序流程从被调函数转向主调函数并把表达式的值带回主调函数，实现函数值的返回，返回时可附带一个返回值，由return后面的参数指定。

return通常是必要的，因为函数调用的时候计算结果通常是通过返回值带出的。如果函数执行不需要返回计算结果，也经常需要返回一个状态码来表示函数执行的顺利与否（-1和0就是最常用的状态码），主调函数可以通过返回值判断被调函数的执行情况。

H. 如何用java做一个计算器，请各位伸出援助之手，小女子感激不尽。

package lab5;
public class Calculate {

double op1 = 0;

double op2 = 0;

double rgst = 0;

double result = 0;

String curStr = "";

Operator op = Operator.ADD;

CalculatorView calView = null;

public Calculate(CalculatorView view) {
op1 = 0;
op2 = 0;
curStr = "0";
rgst = 0;
op = Operator.ADD;
calView = view;
}

public void clear() {
op1 = 0;
op2 = 0;
curStr = "0.0";
op = Operator.ADD;
calView.repaint();
}
/********************************************/
package lab5;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashMap;

public class CalculateController implements ActionListener {
boolean digInputListener = false;

double data = 0;

String digStr = "";

String curStr = "";

CalculatorView calView = null;

Calculate cal = null;

CalculateState curCalState = null;

public static HashMap<String, Operator> operatorMap;
{
operatorMap = new HashMap<String, Operator>();
for (Operator p : Operator.values()) {
String str = p.toString();
operatorMap.put(str, p);
}
}

public CalculateController() {
}

public void setCalculate(Calculate c) {
cal = c;
curCalState = new InitCalculateState(this, cal);
}

public void addCalculateView(CalculatorView view) {
calView = view;
}

public Calculate getCalculate() {
return cal;
}

private void startDigInputListener() {
digInputListener = true;
data = 0;
digStr = "";
}

private void endDigInputListener() {
try {
digInputListener = false;
data = Double.parseDouble(digStr);
} catch (NumberFormatException e) {
cal.clear();
cal.setResult(0.0);
}
}

private void digInputListener(char d) {
digStr += d;
curStr = digStr;
cal.SetCurStr(digStr);
}

public void changeState(CalculateState newState) {
curCalState = newState;
}

public void actionPerformed(ActionEvent e) {
String str = e.getActionCommand();
char firstChar = str.charAt(0);

if ((firstChar <= '9' && firstChar >= '0') || firstChar == '.') {
if (digInputListener == false) {
startDigInputListener();
}
digInputListener(firstChar);
} else {
if (digInputListener == true) {
endDigInputListener();
curCalState.inputD(data);
}

Operator op = operatorMap.get(str);
passMessage(op);
}
}

private void passMessage(Operator op){
switch (op) {

case ADD:
case SUB:
case MUL:
case DIV:
curCalState.inputB(op);
break;

case COS:
case SIN:
case TAN:
curCalState.inputU(op);
break;
case ASSIGN:
curCalState.inputA();
break;
case CE:
curCalState.inputCE();
break;
case MR:
curCalState.inputMR();
break;
case M:
curCalState.inputM();
break;
case MC:
curCalState.inputMC();
break;
case MS:
curCalState.inputMS();
break;
}

}

public CalculatorView getCalculatorView() {
return calView;
}

public static void main(String[] args) {

CalculateController calController = new CalculateController();

CalculatorView mainView = new CalculatorView("Calculator",
calController);
Calculate cal = new Calculate(mainView);

calController.setCalculate(cal);
calController.addCalculateView(mainView);

}
}
****************************************************
package lab5;
public abstract class CalculateState {
protected CalculateController calController;

protected Calculate cal;

public CalculateState(CalculateController controller, Calculate c) {
calController = controller;
cal = c;
}

public void inputA() {

}

void inputD(double d) {

}

void inputU(Operator op) {

}

void inputB(Operator op) {

}
void inputCE(){
cal.clear();
}
/*
* 要存储显示的数据，请单击“MS”。
* 要重新调用存储的数据，请单击“MR”。
* 要清除内存，请单击“MC”。
* 把所显示的数字与内存中的数字相加，请单击“M+”
*/

void inputM(){
double curData = calController.getCalculatorView().getMainScreenData();
cal.setRgst(cal.getRgst() + curData);
}
void inputMR(){
inputD(cal.getRgst());
}
void inputMC(){
cal.setRgst(0);
}
void inputMS(){
double curData = calController.getCalculatorView().getMainScreenData();
cal.setRgst(curData);
}
}
******************************
package lab5;
import java.awt.*;
import javax.swing.*;

public class CalculatorView extends JFrame {
final static long serialVersionUID = 20000;

final int NUM = 24;

JButton[] buttons;

String[] texts = { "CE", "MC", "0", "1", "2", "+", "sin", "MR", "3", "4",
"5", "-", "cos", "MS", "6", "7", "8", "*", "tan", "M+", "9", ".",
"=", "/" };

JTextField rgstScreen;

JTextField mainScreen;

JPanel buttonPanel;

JPanel textPanel;

CalculateController calController = null;

public CalculatorView(String title, CalculateController controller) {
super(title);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
JFrame.(true);

calController = controller;

rgstScreen = new JTextField("0.0", 10);
mainScreen = new JTextField("0.0", 20);
rgstScreen.setEditable(false);
mainScreen.setFocusable(false);

textPanel = new JPanel();
textPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
textPanel.add(rgstScreen);
textPanel.add(mainScreen);

buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(4, 6));

buttons = new JButton[NUM];
for (int i = 0; i < NUM; i++) {
buttons[i] = new JButton(texts[i]);
buttons[i].addActionListener(calController);
buttons[i].setActionCommand(texts[i]);
buttonPanel.add(buttons[i]);
}

this.getContentPane().add(textPanel);
add(textPanel, BorderLayout.NORTH);
add(buttonPanel, BorderLayout.SOUTH);

pack();
setVisible(true);
}
public double getMainScreenData() {
return Double.parseDouble(mainScreen.getText());
}
public void repaint() {
super.repaint();
Calculate cal = calController.getCalculate();
mainScreen.setText(cal.getCurStr());
rgstScreen.setText(Double.toString(cal.getRgst()));
}

}
*************************************
package lab5;
public class InitCalculateState extends CalculateState {
public InitCalculateState(CalculateController controller, Calculate c) {
super(controller, c);
}

public void inputD(double d) {
OnlyOp1 s = new OnlyOp1(calController, cal);
calController.changeState(s);
s.inputD(d);
}
}

class OnlyOp1 extends CalculateState {
public OnlyOp1(CalculateController controller, Calculate c) {
super(controller, c);
}

public void inputA() {
}

public void inputD(double d) {
calController.getCalculate().setOp1(d);
calController.getCalculate().SetCurStr(Double.toString(d));
}

public void inputU(Operator op) {
UniqueOpState u = new UniqueOpState(calController, cal);
//cal.setOp(op);
calController.changeState(u);
u.inputU(op);
}

public void inputB(Operator op) {
WaitOp2 b = new WaitOp2(calController, cal);
calController.getCalculate().setOp(op);
calController.changeState(b);
}
}

class UniqueOpState extends CalculateState {

public UniqueOpState(CalculateController controller, Calculate c) {
super(controller, c);
}

public void inputA() {
dothing();
}

public void inputD(double d) {
OnlyOp1 w = new OnlyOp1(calController, cal);
calController.changeState(w);
w.inputD(d);
}

public void inputU(Operator op) {
cal.setOp(op);
dothing();
}

public void inputB(Operator op) {
WaitOp2 wOp2 = new WaitOp2(calController, cal);
cal.setOp(op);
calController.changeState(wOp2);
}

private void dothing() {
try {
double op1 = cal.result();
cal.setOp1(op1);
cal.SetCurStr(Double.toString(op1));
} catch (Exception e) {
cal.clear();
cal.setResult(0.0);
cal.SetCurStr("异常！");
}
}
}

class WaitOp2 extends CalculateState {

public WaitOp2(CalculateController controller, Calculate c) {
super(controller, c);
}

public void inputA() {
try {
double op2 = cal.getOp1();
cal.setOp2(op2);
double result = cal.result();
cal.setResult(result);
cal.setOp1(result);
cal.SetCurStr(Double.toString(result));
HaveOp2 b = new HaveOp2(calController, cal);
calController.changeState(b);
} catch (Exception e) {
cal.clear();
cal.setResult(0.0);
cal.SetCurStr("异常！");
}
}

public void inputD(double d) {
try {
cal.setOp2(d);
cal.SetCurStr(Double.toString(d));
cal.setResult(cal.result());
HaveOp2 b = new HaveOp2(calController, cal);
calController.changeState(b);
} catch (Exception e) {
cal.clear();
cal.setResult(0.0);

}
}

public void inputU(Operator op) {
UniqueOpState u = new UniqueOpState(calController, cal);
calController.changeState(u);
u.inputU(op);
}

public void inputB(Operator op) {
cal.setOp(op);
}
}

class HaveOp2 extends CalculateState {
public HaveOp2(CalculateController controller, Calculate c) {
super(controller, c);
}

public void inputA() {

try {
double result = cal.result();
cal.setResult(result);
cal.setOp1(result);
cal.SetCurStr(Double.toString(result));
} catch (Exception e) {
cal.clear();
cal.setResult(0.0);

}

}

public void inputD(double d) {
OnlyOp1 w = new OnlyOp1(calController, cal);
calController.changeState(w);
w.inputD(d);

}

public void inputU(Operator op) {
UniqueOpState u = new UniqueOpState(calController, cal);
calController.changeState(u);
u.inputU(op);
}

public void inputB(Operator op) {
WaitOp2 w = new WaitOp2(calController, cal);
double result = cal.getResult();
cal.setOp1(result);
cal.setOp(op);
cal.SetCurStr(Double.toString(result));
calController.changeState(w);
}
}
******************************
package lab5;

public enum Operator {
ADD, SUB, MUL, DIV, COS, SIN, TAN, CE, MR, MC, MS, M, ASSIGN;

public String toString() {

switch (this) {

case ADD:
return "+";
case SUB:
return "-";
case DIV:
return "/";
case MUL:
return "*";
case COS:
return "cos";
case SIN:
return "sin";
case TAN:
return "tan";
case CE:
return "CE";
case MR:
return "MR";
case MC:
return "MC";
case MS:
return "MS";
case M:
return "M+";
case ASSIGN:
return "=";
default:
return "Unkown Operator";

}
}

public static int OperatorType(Operator op) {
int type = 0;

switch (op) {

case ADD:
case SUB:
case MUL:
case DIV:
type = 2;
break;

case COS:
case SIN:
case TAN:
type = 1;
break;

default:
type = 3;
break;
}

return type;

}
}

public String getCurStr() {
return curStr;
}

public void SetCurStr(String str) {
curStr = str;
calView.repaint();
}

public void setOp1(double d) {
op1 = d;
calView.repaint();
}

public void setOp2(double d) {
op2 = d;
calView.repaint();
}

public void setOp(Operator p) {
op = p;
calView.repaint();
}

public void setResult(double result) {
this.result = result;
}

public double getOp1() {
return op1;
}

public double getOp2() {
return op2;
}

public Operator getOp() {
return op;
}
public double getResult(){
return result;
}
public double result() throws Exception{
double ret = 0;

switch (op) {
case ADD:
ret = op1 + op2;
break;

case SUB:
ret = op1 - op2;
break;

case MUL:
ret = op1 * op2;
break;

case DIV:
ret = op1 / op2;
break;

case SIN:
ret = Math.sin(op1);
break;

case COS:
ret = Math.cos(op1);
break;

case TAN:
ret = Math.tan(op1);
break;

}
return ret;
}

public double getRgst() {

return rgst;
}

public void setRgst(double m) {

this.rgst = m;
calView.repaint();
}
}

I. JAVA 编写计算器要代码最简单的

学java的时候自己编的，很简单，能够连续输入计算式后进行计算
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;
import java.util.ArrayList;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
/**简易计算器，能够进行简单的计算
*
* @see 2008.12.9
*/
public class CalculatorA
implements ActionListener{

private JFrame frame;
private JTextField field;
private JButton[] allButtons;
private JButton clearButton;
// private JButton backButton;
String result="";//保存结果
StringBuilder sb = new StringBuilder();//保存要进行的计算式
int x = 0; //用来判断上一次的事件类型
String str = "123+456-789*0.=/";
ArrayList<String> arrayList = new ArrayList<String>();//保存计算式，通过方法进行运算

public CalculatorA(){

frame = new JFrame("我的计算器v1.1");
frame.setLocation(300,300);

field = new JTextField(25);

allButtons = new JButton[16];
for(int i=0;i<allButtons.length;i++){
allButtons[i]= new JButton(str.substring(i,i+1));
}
clearButton = new JButton("CLEAR");
// backButton = new JButton("<——");

init();
setFondAndColor();
addEventHander();
}

public void init(){
frame.setLayout(new BorderLayout());

JPanel northPanel = new JPanel();
JPanel centerPanel = new JPanel();
JPanel southPanel = new JPanel();

northPanel.setLayout(new FlowLayout());
centerPanel.setLayout(new GridLayout(4,4));
southPanel.setLayout(new FlowLayout());

northPanel.add(field);
for(int i=0;i<allButtons.length;i++){
centerPanel.add(allButtons[i]);
}
southPanel.add(clearButton);
//southPanel.add(backButton);

frame.add(northPanel,BorderLayout.NORTH);
frame.add(centerPanel,BorderLayout.CENTER);
frame.add(southPanel,BorderLayout.SOUTH);
}
//设置输入字体
public void setFondAndColor(){
field.setFont(new Font("宋体",Font.BOLD,24));
field.setBackground(new Color(100,200,200));
field.setForeground(Color.RED);
//设置字体从右起始
field.setHorizontalAlignment(JTextField.RIGHT);
}

public void showMi(){
frame.pack();
frame.setResizable(false);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public void addEventHander(){
for(int i=0;i<allButtons.length;i++){
allButtons[i].addActionListener(this);
}
clearButton.addActionListener(this);
// backButton.addActionListener(this);
}
@Override
public void actionPerformed(ActionEvent e) {
String str = e.getActionCommand();//取得当前事件返回的值
if("0123456789.".indexOf(str)!=-1){
if(x == 0){ //当x为0时表示还没有进行输入
result=str;
sb.append(str);
field.setText(str);
x = 1;
}
else if(x == 1){
result = result +str;
sb.append(str);
field.setText(result);
x = 1;
}
else if(x == 2){
sb.delete(0,sb.length());
result = result+str;
sb.append(str);
field.setText(result);
x = 1;
}
else if(x == 3){
result = str;
sb.delete(0,sb.length());
arrayList.clear();
field.setText(str);
sb.append(str);
field.setText(str);
x = 1;
}
else if(x == 4){
result ="";
sb.delete(0,sb.length());
arrayList.clear();
result = str;
sb.append(str);
field.setText(str);
x = 1;
}
else{
result = result +str;
sb.append(str);
field.setText(result);
x = 1;
}
}
else if("+*-/".indexOf(str)!=-1){
if(x == 0){
field.setText("");
x = 2;
}
else if(x == 1){
result = result + str;
arrayList.add(sb.toString());
arrayList.add(str);
sb.append(str);
field.setText(result);
x = 2;
}
else if(x == 2){
x = 2;
}
else if(x == 3){
field.setText(result+str);
arrayList.add(result);
arrayList.add(str);
result = result+str;
x = 2;
}
else if(x == 4){
result ="";
sb.delete(0,sb.length());
arrayList.clear();
x = 2;
}
else{
field.setText(result+str);
arrayList.add(result);
arrayList.add(str);
result = result+str;
x = 2;
}
}
else if("=".equals(str)){
if(x == 0){
field.setText("0");
arrayList.clear();
result = "0";
x = 3;
}
else if(x == 1){
try{
arrayList.add(sb.toString());
arrayList = getResult(arrayList);
result = arrayList.get(0);
field.setText(result);
arrayList.clear();
x = 3;
}catch(Exception e1){
field.setText("数据格式异常");
x = 0;
}
}
else if(x == 2){
field.setText("数据格式错误.....");
arrayList.clear();
x = 0;
}
else if(x == 3){
field.setText(result);
x = 3;
}
else if(x == 4){
result ="";
sb.delete(0,sb.length());
arrayList.clear();
x = 3;
}
else {
try{
arrayList.add(sb.toString());
arrayList = getResult(arrayList);
result = arrayList.get(0);
field.setText(result);
arrayList.clear();
x = 3;
}catch(Exception e1){
field.setText("数据格式异常");
x = 0;
}
}
}
else if("CLEAR".equals(str)){
arrayList.clear();
field.setText("0");
arrayList.add("0");
x = 4;
}
else{
if(result.length()>1){
result = result.substring(0,result.length()-1);
if(sb.length()>0){
sb.delete(sb.length()-1,sb.length());
}
else {
sb.delete(0,1);
}
field.setText(result);
x = 5;
}
else{
result = "";
sb.delete(0,sb.length());
arrayList.clear();
field.setText("0");
x = 0;
}
}
}
public static ArrayList<String> getResult(ArrayList<String> list){
String res = null;
String[] s = {"/","*","-","+"};
int i=0;
if(list.size()>1){
for(;i<s.length;){
if(s[i].equals("/")){
for(int j=0;j<list.size();j++){
if(list.get(j).equals(s[i])){
res = Double.toString(Double.parseDouble(list.get(j-1))/Double.parseDouble(list.get(j+1)));
//本地的数据格式
NumberFormat nf = NumberFormat.getInstance();
res = nf.format(Double.parseDouble(res));
res = getChange(res);
list.set(j-1,res);
list.remove(j);
list.remove(j);
getResult(list);
}
}
i++;
}
else if(s[i].equals("*")){
for(int j=0;j<list.size();j++){
if(list.get(j).equals(s[i])){
res = Double.toString(Double.parseDouble(list.get(j-1))*Double.parseDouble(list.get(j+1)));
NumberFormat nf = NumberFormat.getInstance();
res = nf.format(Double.parseDouble(res));
res = getChange(res);
list.set(j-1,res);
list.remove(j);
list.remove(j);
getResult(list);
}
}
i++;
}
else if(s[i].equals("-")){
for(int j=0;j<list.size();j++){
if(list.get(j).equals(s[i])){
res = Double.toString(Double.parseDouble(list.get(j-1))-Double.parseDouble(list.get(j+1)));
NumberFormat nf = NumberFormat.getNumberInstance();
res = nf.format(Double.parseDouble(res));
res = getChange(res);
list.set(j-1,res);
list.remove(j);
list.remove(j);
getResult(list);
}
}
i++;
}
else {
for(int j=0;j<list.size();j++){
if(list.get(j).equals(s[i])){
res = Double.toString(Double.parseDouble(list.get(j-1))+Double.parseDouble(list.get(j+1)));
NumberFormat nf = NumberFormat.getInstance();
res = nf.format(Double.parseDouble(res));
res = getChange(res);
list.set(j-1,res);
list.remove(j);
list.remove(j);
getResult(list);
}
}
i++;
}
}
}
return list;
}
//对数字字符串进行排除不必要符号
public static String getChange(String res){
String s_temp = "";
char[] c = new char[res.length()];
for(int k=0;k<c.length;k++){
c[k] = res.charAt(k);
}
for(int k=0;k<c.length;k++){
if((c[k]>= '0' && c[k]<= '9')|| c[k] == '.'){
s_temp += c[k];
}
}
return s_temp;
}
public static void main(String[] args){
new CalculatorA().showMi();
}
}

J. 用C语言设计一个简单计算器

#include<stdio.h>
voidadd(inta,intb,intc)
{
c=a+b;
printf("%d	",c);
printf("
");
}
voidminus(inta,intb,intc)
{
c=a-b;
printf("%d	",c);
printf("
");
}
voidmultiplication(inta,intb,intc)
{
c=a*b;
printf("%d	",c);
printf("
");
}
voiddiv(inta,intb,intc)
{
c=(float)a/(float)b;
printf("%f	",c);
printf("
");
}
main()
{
inta,b,c;
charp;
puts("inputA:
");
scanf("%d",&a);
puts("inputB:
");
scanf("%d",&b);
puts("inputoperation:
");
getchar();
p=getchar();
if(p=='+')add(a,b,c);else
if(p=='-')minus(a,b,c);else
if(p=='*')multiplication(a,b,c);else
if(p=='/')div(a,b,c);else
puts("没有注册这个运算符号
");
}

以上是设计的一个简易计算器。可以进行相应的加减乘除。

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