ZOJ 3191 Strange Clock

#include<stdio.h>
int main()
{
 int i,d;
 int c[12]={90,60,30,0,330,300,270,240,210,180,150,120};
 while(scanf("%d",&d)!=EOF && d!=-1)
 {
  for(i=0;i<12;i++){
   if(d==c[i]) printf("Exactly %d o'clock\n",i);
   else if(d<c[i]&&d>c[i+1]){
     printf("Between %d o'clock and %d o'clock\n",i,i+1);
         }
         if(d>c[0]&&d<c[11]){
    printf("Between 11 o'clock and 0 o'clock\n");
          break;
   }
  }
 }
 return 0;
}