void revise()
{
    char a,b;
    //int c;
    printf("您选择的美食：\n");
    display();
    printf("   Y.确认  R.修改   N.取消\n");
    scanf("%c",&a);
    if(a=='y'||a=='Y')
    {
    //跳转至送餐信息
    }
    if(a=='r'||a=='R')
    {
        system("cls");
        printf("您选择的美食：\n");
        display();
        printf("    修  改  ： \n");
        printf("请选择您要修改的序号：");
        getchar();
        scanf("%c",&b);
        switch(b)
        {
        case 1:menu11();break;
        case 2:menu11();break;
        case 3:menu11();break;
        case 4:menu11();break;
        case 5:menu11();break;
        case 6:menu12();break;
        case 7:menu12();break;
        case 8:menu12();break;
        case 9:menu12();break;
        case 10:menu12();break;
        case 11:menu13();break;
        case 12:menu13();break;
        case 13:menu13();break;
        case 14:menu13();break;
        case 15:menu13();break;
        }
    }
    if(a=='n'||a=='N')
        menu11();
    }
}