尝试使用开关创建日历，如果要检查用户输入的语句然后输出日期

Question

因此，我试图创建一个日历，使用switch语句以数字方式询问用户选择的月份和日期，然后尝试使用if语句检查用户的日期输入，如果匹配，则显示日期。

运行时，即使我输入了星期一的日期，它也始终打印星期日。我想念什么？

这是我的代码

    void UserInput()
    {
    cout << "\nPlease enter a numerical value of a month e.g. May=5, December=12: \n";
    cin >>  Month;

    cout << "\nPlease enter a Date: \n";
    cin >>  Date;
    }

    void MagicCalendar()
    {
    switch(Month)
    {
    case 1:
    if(Date == 6 || 13 || 20 || 27)
    {
    cout << " It's Sunday!!!";
    break;
    } 
    if(Date == 7 || 14 || 21 || 28 )   <-- the problem is probably here idk if its the operand or the if statement itself
    {
    cout << " It's a MOFO MONDAY GO KYS NOW!";
    break;
    }
    else if(Date ==)
    {
    cout << " It's a Tuesday and kinda like a monday but yeah...";
    break;
    }
    else if(Date ==)
    {
    cout << " It's Wednesday and I know that you can feel it!";
    break;
    }
    else if(Date ==)
    {
    cout << " It's a THURSDAY!! getting warmer :D";
    break;
    }
     else if(Date ==)
    {
    cout << " It's FRIDAY!! GO GET SHITFACED YOU DESERVE IT :D";
    break;
    }
    else if(Date ==)
    {
    cout << " It's SATURDAY BABY! go cry in a corner while suffering from Hungover...";
    break;
    }
    break;    
}
}

Answer 1

if(Date == 6 || 13 || 20 || 27)

语法错误

正确：

if(Date == 6 || Date == 13 || Date == 20 || Date == 27)

类似于代码中的其他行。