简单输出
```
#include<stdio.h>
int.main()
{
printf("hello Qingdao!");
return 0;
}
```
计算圆的面积
```
#include<stdio.h>
#define PI 3.14
doudle calculateVolume(int radius);
int main();
{
int cRadius = 0;
doudle volume = 0.0;
printf("请输入圆的半径: \n");
scanf("%d" , %cRadius);
volume = calcuateVolume(cRadius);
printf("圆的面积是: %f \n", volume);
retum 0;
)
doudle calculateVolume(int radius);
(
double result = PI("radius"radius;
return result;
)
```
