3-6

#include<stdio.h>
int main(void)
{
    int i,x;
    double price;
    
    for(i=1;i<=5;i++){
        printf("[1]apples\n");
        printf("[2]pears\n");
        printf("[3]oranges\n");
        printf("[4]grapes\n");
        printf("[0]exit\n");
        printf("输入编号：\n");
        scanf("%d",&x);
        if(x==0)
            break;
        switch(x){
            case 1:price=3.00;break;
            case 2:price=2.50;break;
            case 3:price=4.10;break;
            case 4:price=10.20;break;
            default:price=0.00;break;
        }
        printf("price=%.3f",price);
    }
    return 0;
}