程序代码：

#include<stdio.h>
void main()
{
    int tian, xingqi;
    printf("输入0~366\n");
    scanf_s("%d", &tian);
    xingqi = tian / 7;
    if (tian > 0)
    {
        printf("是2016年的第%d个星期\n", tian % 7 == 0 ? xingqi : ++xingqi);
    }
    printf("请输入大于0的数字\n");
}

[此贴子已经被作者于2016-4-5 13:57编辑过]

程序代码：

#include <stdio.h>

int main()
{
    int day=0,week=0;
    scanf("%d",&day);

    if(day>=1&&day<=366)
    {
        if(day%7==0)  week=day/7;
        else  week=1+day/7;
    }

    printf("It's the %dth week of 2016\n",week);

    return 0;
}