Ayear in the modern gregorian calendar consists of 365 days. in reality, the earth takes longer to rotate around the sun. to account for the difference in time, every 4 years, a leap year takes place. a leap year is when a year has 366 days: an extra day, february 29th. the requirements for a given year to be a leap year are: 1) the year must be divisible by 4 2) if the year is a century year (1700, 1800, the year must be evenly divisible by 400 some example leap years are 1600, 1712, and 2016. write a program that takes in a year and determines whether that year is a leap year. ex: if the input is 1712, the output is:

// program in C.

#include <stdio.h>

// main function

int main()

{

   // variable

  int y;

  printf("Enter a year : ");

     // read year

  scanf("%d",&y);

// check leap year

   if((y % 4 == 0 && y % 100 != 0) || (y % 400 == 0))

    printf("%d is leap year.",y);

   else

   printf("%d is not a leap year.",y);

return 0;

}

Explanation:

Read year from user and assign it to variable "y".If year is divisible by 4 and not divisible by 100 or year is divisible by 400 then year is leap year otherwise year is not a leap year.

Output:

Enter a year : 2009                                                                                                        

2009 is not a leap year.