5-1

#include<stdio.h>
#include<string.h>
#define MI 60
int main(void)
{
int min,minute,hour;
min=minute=hour=0;
printf("please input min\n");
scanf("%d",&min);
while(min>0)
{
hour=min/MI;
minute=min%MI;
if(minute<10)
{
printf("%d:0%d",hour,minute);
}else
{
printf("%d:%d",hour,minute);
}

scanf("%d",&min);
}

return 0;
}