题目一：简单输出
#include <stdio.h>
int main()
{
printf("Hello word! \n");
return 0;
}
题目二:圆的面积
#include <stdio.h>
#define PI 3.14
double calculateVolume(int radius);
int main()
{
int cRadius = 0;
double volume = 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;
}