作业一：简单输出
#include <stdio.h>
int main()
{
printf("Hello C's world!\n");
return 0
}
作业二：计算圆面积
#include <stdio.h>
#double PI 3.14
double calculateVolume (int radius);
int main ()
{
int cRadius = 0;
double volume = 0.0;
printf ("请输入圆的半径：\n");
scanf ("%d", &cRadius);
volume = calculateVolume (cRadius);
printf ("圆的面积是：%f\n", volume);
return 0;
}
double calculateVolume (int radius)
{
double result = PI*radius*radius;
return result;
}
