/* Filename     :   ifleap.c
 * Function Name:   main
 * Written By   :   Prof. Kantila [kantila@gmail.com]
 * Dated        :   12th Dec 2006
 * Modified on  :   18th Dec 2006
 * Purpose      :   Program to check the given year for leap year
 * Arguments    :   None, Ask interactively
 * Header files :   stdio.h, string.h, ctype.h, leap.h, bool.h
 */
#include <stdio.h>  /*Standard Input/Output functions required */
#include <string.h> /*strlen function required */
#include <ctype.h>  /*isdigit, atol functions required */
#include "leap.h"   /*leapf function required */
#include "bool.h"   /*bool data type required */
int main(void)
{
    long int y1=0;
    char string[10];
    short length,counter;
    bool ok=false;
    fputs("This will check the given year & display whether its a leap year or not...\n",stderr);
    while(!ok)
    {
      fprintf(stderr,"Input year to check [1-999999999] : ");
      fscanf(stdin,"%9s",string);
      fflush(stdin);
      length=strlen(string);
      for(counter=0;counter<length;counter++)
      {
              if(!isdigit(string[counter]))
              {
                 ok=false;
                 break;
              }
              else
                  ok=true;
      }
      if(ok)
      {
            y1=atol(string); /*ASCII to LONG INTEGER */
            if(y1==0)
               break;
            fprintf(stdout,"Year %li is %s a leap year\n",y1,((leapf(y1))?"\b":"not"));
            ok=false;
      }
      else
          fprintf(stderr,"Invalid year!\a\a\n");
    }
    fprintf(stderr,"Thanks for using 'ifleap.exe' created at MEC, Bikaner.");
    return 0;
}