10.5

显示名字

#include <stdio.h>

int main ()
{
    printf ("songguolin\n");
        return 0 ;
}

计算圆柱底面积

#include<stdio.h>
#define 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;
 }