C计算时间代码！

//min_sec.c--把秒转换为分钟和秒
#include
#define SEC_PER_MIN 60 //每分钟的秒数
int main(void)
{
int sec,min,left;
printf("Convert seconds to minutes and seconds!\n");
printf("Enter the number of seconds (<=0 to quit):\n");
scanf("%d",&sec); //读入秒数
while(sec>0)
{
min = sec /SEC_PER_MIN;//截尾后得到的分钟数
left = sec % SEC_PER_MIN;//剩下的秒数
printf("%d seconds is %d minutes. %d seconds.\n",sec,min,left);
printf("Enter next value (<=0 to quit):\n");
scanf("%d",&sec);

}
printf("Done!\n");
return 0;
}