C++,日历1900年1月1日星期一

#include"stdio.h"
int a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
int b[13]={0,31,29,31,30,31,30,31,31,30,31,30,31};

/*判断闰年*/
int leap(int year)
{
    if(year%4==0&&year%100!=0||year%400==0)
        return 1;
    else
        return 0;
}

/*计算该年元旦的星期数*/
int year_yuandan_week(int year)
{
int m,i,sum,week=1,count=0;

    if(year<1900)
    {
for(i=year;i<1900;i++)
if(leap(i))
count++;
sum=(1900-year)*365+count;
m=sum%7;
week=week-m;
if(week<=0)
week=week+7;
return week;
}