how to get leap years between years

[Bernie]

hi im bernie,, any one who know the code of getting the leap years between two inputted years??.its hard for me to get the code so help me please...
this is the sample output,,

sample output1(past to recent)
Enter Year From: 1993
Enter Year To : 2000

Leap years are :
1996
2000

sample output2(recent to past)
Enter Year From: 2003
Enter Year To : 1985

Leap years are :
2000
1996
1992
please help me!!..thank you very much!!!

[teknomage1]

I think it would be easiest if you just wnet through each year with a for loop and evaluated it according to the predicates for a leap year.
-a year divisible by 4 is a leap year
-a year divisible by 100 is not a leap year
-a year divisble by 1000 is a leap year
-anything else is not a leap year
So 1996, 2000, and 2004 are but 2100 is not

[redhead]

Something like:

#include <stdio.h>
#include <stdlib.h>
#define LENGTH 6

int leap_year(int* year);

int main(){
  char buffer[LENGTH +1];
  int year_from, year_to;
  unsigned short int add = 1;
  printf("Enter year From: ");
  fflush(stdout);
  if(!fgets(buffer, LENGTH, stdin))
  {
    printf("Error reading from stdin\n");
    return -1;
  }
  year_from = strtol(buffer,(char **)NULL, 10);
  if(year_from < 0)
    {
      printf("Error getting year from\n");
      return -1;
    }
  printf("Enter year To:  ");
  fflush(stdout);
  if(!fgets(buffer, LENGTH, stdin))
  {
    printf("Error reading from stdin\n");
    return -1;
  }
  year_to = strtol(buffer,(char **)NULL, 10);
  if(year_to <= year_from)
  {
    add = 0;
  }
  while(1)
    {
      if(add)
      {
          if(year_from > year_to)
            break;
      }
      else
          if(year_to > year_from)
            break;
                   
      if(leap_year(&year_from))
	printf("%d\n", year_from);
      if(add)
        ++year_from;
      else
         year_from--;
    }
  return 0;
}

int leap_year(int* year)
{
  if(!(*year%400))
    return 1;
  if(!(*year%100))
    return 0;
  if(!(*year%4))
    return 1;
  return 0;
}

[Bernie]

recent to past should be also included and will be printed...
like
Enter year From: 2005
Enter year to: 1985
then the leap years...thank you so much..your a genius!!

bernie

[redhead]

I altered my example to include that aswell..
But since I take it you only got a look at my first version, where it was only accepting past to recent you can figure out a way to inplement it in a less crude way than I did once I realized it was supposed to do that aswell.

[Valmont]

Urgently need help, Functions and leap year problem

[teknomage1]

Oh dear how embarrassing, Valmont has shown that my 1000 year predicate should be 400 years.