C++ Program to take a value from the user as input the month number and print number of days in that month. Using user define functions.

Explanation:

1. Pass-by-Value (getDaysInMonthByValue):
   • Function Definition: void getDaysInMonthByValue(int month)
   • This function takes the month number month as a parameter by value.
   • It uses a switch statement to determine the number of days in the month.
   • It prints the result directly.
2. Pass-by-Reference (getDaysInMonthByReference):
   • Function Definition: void getDaysInMonthByReference(int month, int &days)
   • This function takes the month number month by value and a reference to an int variable days.
   • It uses a switch statement to determine the number of days and updates the days reference variable accordingly.
   • The result is updated through the reference variable, and the function does not print directly. Instead, it relies on the main function to handle the output.
3. Main Function (main):
   • Prompts the user to input a month number (from 1 to 12).
   • It uses both pass-by-value and pass-by-reference methods to get and display the number of days in the month.

Example Outputs:

Example 1:

Input:

• Month number: 2

Output:

Example 2:

Input:

• Month number: 4

Output:

Example 3:

Input:

• Month number: 13

Output: