编辑代码

#include <stdio.h>
#define DAY_W 7

int main () 
{
    int day, week;
    scanf("%d", &day);

    while(day>0)
    {
        printf ("%d days are ", day);
        week = day / 7;
        day = day % 7;
        printf("%d weeks, %d days.\n", week, day);
        scanf("%d", &day);
    }
    
	return 0;
}