/* File: easter.c */
#include <stdio.h>
#define STARTYEAR 2000
#define ENDYEAR   2015

main()
{ int year, a, b, c, d, e;
  for (year = STARTYEAR ; year <= ENDYEAR ; year++) {
    a = year % 19;
    b = year % 4;    /* Gauss method for Easter date computation */
    c = year % 7;
    d = (19*a+15) % 30;
    e = (2*b+4*c+6*d+6) % 7;
    printf("Easter in the year %d: ", year);
    if (d+e+4 > 30)                             /* Easter in May */
      printf("  May %d\n", d+e-26);
    else                                      /* Easter in April */
      printf("April %d\n", d+e+4);
  }
}