Leap Year Demo in C

leap.c

#include <stdio.h>

typedef enum { FALSE, TRUE } boolean;

boolean isLeapYear(int);
char* getLeapInfo(int);

int main()
{
	for(int i = 1980; i <= 2017; i++)
		printf("%d %s\n", i, getLeapInfo(i));
	
	return 0;
}

boolean isLeapYear(int year)
{
	if( (year%4 == 0 && year%100)!= 0 || (year%400 == 0) )
		return TRUE;
	
	return FALSE;
}

char* getLeapInfo(int year)
{
	if( isLeapYear(year) == TRUE )
		return "is a LEAP year";
	
	return "not a leap year";
}

Output;

1980 is a LEAP year
1981 not a leap year
1982 not a leap year
1983 not a leap year
1984 is a LEAP year
1985 not a leap year
1986 not a leap year
1987 not a leap year
1988 is a LEAP year
1989 not a leap year
1990 not a leap year
1991 not a leap year
1992 is a LEAP year
1993 not a leap year
1994 not a leap year
1995 not a leap year
1996 is a LEAP year
1997 not a leap year
1998 not a leap year
1999 not a leap year
2000 is a LEAP year
2001 not a leap year
2002 not a leap year
2003 not a leap year
2004 is a LEAP year
2005 not a leap year
2006 not a leap year
2007 not a leap year
2008 is a LEAP year
2009 not a leap year
2010 not a leap year
2011 not a leap year
2012 is a LEAP year
2013 not a leap year
2014 not a leap year
2015 not a leap year
2016 is a LEAP year
2017 not a leap year