这个程序为什么输入0不能退出while循环？

  1 #include<stdio.h>
  2 #define MIN_PER_HOUR 60
  3 int main (void)
  4 {
  5         int min,hour,surplus;
  6         printf("convert minutes to hour and minutes!\n"
  7                         "enter the mumber of minutes(<=0 to quit)\n");
  8         while (scanf("%d", &min) > 0)
  9         {
 10                 hour = min / MIN_PER_HOUR;
 11                 surplus = min % MIN_PER_HOUR;
 12                 printf("%d hour %d mins\n", hour, surplus);
 13                 printf("Enter next values.(<=0 quit)\n");
 14         }
 15         printf("Thaks!\n");
 16
 17         return 0;
 18 }
为什么不能退出while循环，请大神解释解释！！！
拜托了！！！！