作业一：名字代码

#include <stdio.h>

int main () 
{
    printf("周小伶");  
    return 0 ; 
 }

作业二：圆的代码

#include <stdio.h>                       
#define PI 3.14                         
double  calculateArea (int radius);   
int main ()                           
 {
    int  cRadius =0;                   
    double Area =0.0;                   
    printf("请输入圆的半径：\n"); 
    scanf("%d",&cRadius);            
    Area=calculateArea(cRadius);     
    printf("圆的面积是：%f\n", Area);  
    return 0 ;                       
}
double calculateArea (int radius)  
{
    double result = PI*radius*radius;
    return result;                   
 }