Why I'm WA? And I don't konw if it is only 1 test case?

//PKKU3047 Bovine Birthday
#include <stdio.h>
#include <stdlib.h>

int y,m,d,w,c;
char *weekday[]={"sunday","monday","tuesday","wednesday","thursday","friday","saturday"};

int main()
{
    scanf("%d%d%d",&y,&m,&d);
    if (m>=3) m-=2;
    else if (m==1) m=11,y--;
    else m==12,y--;
    c=y/100;
    y=y%100;
    w=(c/4-2*c+y+y/4+((13*m-1)/5)+d)%7;
    printf("%s\n",weekday[w]);
    system("pause");
}

• Re:Why WA? (568) betaver 2006-10-22 00:09:30
  • 重写了,还是WA (399) betaver 2006-10-22 12:22:28
    • Still WA (397) betaver 2006-10-22 12:23:44
      • W取模后可能是负数啊，这个你没处理。 (437) winsweet 2008-08-28 07:26:43