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用c语言求圆的面积
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#include "stdio.h"
#include "process.h"
#define PI 3.1415926;
double calcAreaOfCircleByR(double r);//声明函数计算圆面积 r为半径
double calcAreaOfCircleByD(double d);//声明函数计算圆面积 d为直径
int main(int argc, char* argv[]){
double r = 1.0;
double d = 2.0;
printf("半径r=%g的圆面积%g\n", r, calcAreaOfCircleByR(r));
printf("直径d=%g的圆面积%g\n", d, calcAreaOfCircleByD(d));
printf("\n");
system("pause");
return 0;
}double calcAreaOfCircleByR(double r)//计算圆面积 r为半径
{
return (r)* (r)* PI;
}
double calcAreaOfCircleByD(double d)//计算圆面积 d为直径
{
return (d * d / 4) * PI;
}
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