C Primer plus 习题5.3

#include <stdio.h>
#define WEEK 7 
int main()
{
 
int days; 
printf("Please input the days:");
scanf("%d",&days);
while(days>0)
{
 
printf("%d days are %d weeks,%d days.\n",days,days/WEEK,days%WEEK);
printf("Please input the days:");
scanf("%d",&days);
} 
return 0;
}