int choice,i;
    double price;
    for(i=1;i<=5;i++){
        //以下5行显示菜单
        printf("[1]Select crisps\n");  //查询薯片价格
        printf("[2]Select popcorn\n");  //查询爆米花价格
        printf("[3]Select chocolate\n");  //查询巧克力价格
        printf("[4]Select cola\n");  //查询可乐价格
        printf("[0]exit\n");  //退出查询
        printf("Enter choice:");
        scanf("%d",&choice);  
        
        if(choice == 0)  //如果输入为0，则提前结束循环 
            break; 
            
        switch(choice){
            case 1:price = 3.0;break;
            case 2:price = 2.5;break;
            case 3:price = 4.0;break;
            case 4:price = 3.0;break;
            default:price = 0.0;break;
            
        
        }
        
    printf("price = %0.1f\n",price);
    }
    printf("Thank you\n");
    return 0;