求圆的面积c语言程序

① C璇瑷涓鍦嗙殑闱㈢Н镐庝箞姹傦纻

璁＄畻鍦嗙殑闱㈢Н镄勭紪绋嬫槸锛

#include <stdio.h>

#define N 3.14 //鍦嗗懆鐜

float S(float r)//璁＄畻闱㈢Н

{

float s;

s=N*r*r;

return s;

}

void main()

{

float r;

printf("璇疯緭鍏ュ浑镄勫崐寰:");

scanf("%f",&r);

printf(" 璇ュ浑镄勫崐寰勬槸锛%f",S(r));

}