例3-8

#include<stdio.h>
int main(void)
{
    int choice,i;
    double price;

    for(i=1;i<=5;i++){
        printf("[1]Select crisps\n");
        printf("[2]Select popcorn\n");
        printf("[3]Select chocolate\n");
        printf("[4]Select cola\n");
        printf("[0]exit\n");

        printf("Enter choice:");
        scanf_s("%d",&choice);

        if(choice==0)
            break;

        switch(choice){
        case 1:price=3.0;break;
        case 2:price=2.5;break;
        case 3:price=4.0;break;
        case 4:price=3.5;break;
        default:price=0.0;break;
        }
        printf("price=%0.1f\n",price);
    }
    printf("Thanks\n");

    return 0;
}