Days in a month (leap years)

Problem

Write a class DaysInMonth that reads a year and a month (1–12) and prints the number of days, as Days: 29.

A year is a leap year when it is divisible by 4, except years divisible by 100, unless they are also divisible by 400. So 2000 is a leap year, 1900 is not.

If the month is not between 1 and 12, print Invalid month.

Your solution

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