输入年份year和天数day，打印出_月_日

#include <stdio.h>

int is_leapyear(int year)
{
    int flag=0;
    if(year%400==0 ||(year%100!=0 && year%4==0))
        flag = 1;


    return flag;
}
int main()
{
    int a[13]={0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365};
    int b[13]={0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366};
    int month, day;
    int year, num;
    int i;


    printf("请输入年份和天数:\n");
    scanf("%d%d", &year, &num);

    if(is_leapyear(year)==1)
    {
        for(i=1; i<13; i++)
        {
            if(num<=b[i])
            {
                month = i;
                day = num-b[i-1];
                break;
            }
        }
    }
    else
    {
        for(i=1; i<13; i++)
        {
            if(num<a[i])
            {
                month = i;
                day = num-a[i-1];
                break;
            }
        }
    }

    printf("%d的第%d天是:%d月%d日\n", year, num, month, day);
    return 0;

}