Question

Write a program named CheckMonth2 that prompts a user to enter a birth month and day.

Display an error message that says Invalid date if the month is invalid (not 1 through 12) or the day is invalid for the month (for example, not between 1 and 31 for January or between 1 and 29 for February).

If the month and day are valid, display them with a message. For example, if the month entered is 2, and the day entered is 17, the output should be 2/17 is a valid birthday.

This is the code i start with. (Answer is C# Please.)

using System;
using static System.Console;
class CheckMonth2
{
static void Main()
{
// Write your main here
}
}

Answer 1

using System;

class CheckMonth2{

public static void Main (string[] args) {

Console.WriteLine ("Enter day and month : ");

int day = Convert.ToInt32(Console.ReadLine());

int month = Convert.ToInt32(Console.ReadLine());

int days=getDays(month);

if(days==-1){

Console.WriteLine("Invalid month. Must be 1 to 12");

}

else if(day!=days){

Console.WriteLine("Invalid days. must be "+days);

}

else{

Console.WriteLine(month+"/"+day+" is a valid birthday");

}

}

static int getDays(int mm) {

    int res = -1;

    switch (mm) {

    case 1:

      res = 31;

      break;

    case 2:

        res = 29;

      break;

    case 3:

      res = 31;

      break;

    case 4:

      res = 30;

      break;

    case 5:

      res = 31;

      break;

    case 6:

      res = 30;

      break;

    case 7:

      res = 31;

      break;

    case 8:

      res = 31;

      break;

    case 9:

      res = 30;

      break;

    case 10:

      res = 31;

      break;

    case 11:

      res = 30;

      break;

    case 12:

      res = 31;

      break;

    }

    return res;

  }

}

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