#include?"stdio.h"
#include?"process.h"
#define?PI?3.1415926;
double?calcAreaOfCircleByR(double?r);//聲明函數計算圓面積?r為半徑
double?calcAreaOfCircleByD(double?d);//聲明函數計算圓面積?d為直徑
int?main(int?argc,?char*?argv[])
{
double?r?=?1.0;
double?d?=?2.0;
printf("半徑r=%g的圓面積%g\n",?r,?calcAreaOfCircleByR(r));
printf("直徑d=%g的圓面積%g\n",?d,?calcAreaOfCircleByD(d));
printf("\n");
system("pause");
return?0;
}
double?calcAreaOfCircleByR(double?r)//計算圓面積?r為半徑
{
return?(r)*?(r)*?PI;
}
double?calcAreaOfCircleByD(double?d)//計算圓面積?d為直徑
{
return?(d?*?d?/?4)?*?PI;
}