int dianleshenmecai(char  b)
{

    char a;
    a=getchar();

    if((b>=0)&& (b<=9)||(b==a))
    {
        if(b==1) printf("1、宫保鸡丁 10元\n");
        if(b==2) printf("2、酱爆鸭片 18元\n");
        if(b==3) printf("3、木须肉 15元\n");
        if(b==4) printf("4、沸腾鱼 88元\n");
        if(b==5) printf("5、手撕圆白菜 12元\n");
        if(b==6) printf("6、麻婆豆腐 8元\n");
        if(b==7) printf("7、小鸡炖蘑菇 48元\n");
        if(b==8) printf("8、水晶肘子 58元\n");
        if(b==9) printf("9、米饭 3元\n");
        if(b==0) printf("香酥带鱼 25元\n");
        if(b==a)
        {
            printf("返回！\n");
            return 0;
        }
    }
        return b;
   

    return 10;
    system("cls");
    dayin();

}

b就是输入的那个变量呀

选择 1.点餐  后进入二级菜单：
                        1.宫保鸡丁          10
                        2.酱爆鸭片          18
                        3.木须肉         15
                        4.沸腾鱼            88
                        5.手撕圆白菜        12
                        6.麻婆豆腐        8
                        7.小鸡炖蘑菇        48
                        8.水晶肘子        58
                        9.米饭            3
                        0.香酥带鱼       25
                        a.返回
就是实现这种结果