Write a leap_year.cpp program that:
Takes a year as input.
Checks to see if the year is a four-digit number.
Displays whether or not the year falls on a leap year.
There are 3 criteria that must be taken into account to identify a leap year:
If the year can be evenly divided by 4 then it is a leap year, however…
If that year can be evenly divided by 100, and it is not evenly divided by 400, then it is NOT a leap year.
If that year is evenly divisible by 400, then it is a leap year.