求圓的面積c語言程序

① C璇璦涓鍦嗙殑闈㈢Н鎬庝箞奼傦紵

璁＄畻鍦嗙殑闈㈢Н鐨勭紪紼嬫槸錛

#include <stdio.h>

#define N 3.14 //鍦嗗懆鐜

float S(float r)//璁＄畻闈㈢Н

{

float s;

s=N*r*r;

return s;

}

void main()

{

float r;

printf("璇瘋緭鍏ュ渾鐨勫崐寰:");

scanf("%f",&r);

printf(" 璇ュ渾鐨勫崐寰勬槸錛%f",S(r));

}