#include<stdio.h>
#define YES   1           /* 定义符号常数"是" */
#define NO    0           /* 定义符号常数"否" */
/* 函数 isleap(): 判断某年是否闰年 */
int isleap(int year)
{
    int leap = NO;
    if((year%4==0 && year%100!=0 )|| year%400==0)
        leap = YES;
    return leap;
}
/* 函数 week_of_newyears_day(): 求元旦是星期几 */
int week_of_newyears_day(int year)
{
    int n = year-1900;
    n = n+(n-1)/4+1;
    n = n%7;
    return n;
}
int main(int argc,char *argv[])
{
    int year, month, day, weekday, len_of_month, i;
    printf("\n请输入某年年份: ");
    scanf("%d",&year);
    printf("\n请输入某年1月1日：");
    scanf("%d",&weekday);
     printf("\n\n\n               %d年\n",year); /* 打印年份     */
    for(month=1; month<=12;month=month+1) /* 打印12个月的月历 */
    {
        printf("\n%d月份\n",month);
        printf("------------------------------------------------------\n");
        printf("星期日  星期一  星期二  星期三  星期四  星期五  星期六\n");
        printf("------------------------------------------------------\n");
        for(i=0;i<weekday;i=i+1)       /* 找当月1日的打印位置 */
            printf("        ");
        if(month==4 || month== 6 || month==9 || month==11)
            len_of_month = 30;
        else if(month==2)
        {
            if(isleap(year))
                len_of_month = 29;
            else
                len_of_month = 28;
        }
        else
            len_of_month = 31;
        for(day=1;day<=len_of_month;day=day+1)/* 打印当月日期 */
        {
            printf("   %2d   ",day);
            weekday = weekday+1;
            if(weekday==7)                /* 打满一星期应换行 */
            {
                weekday = 0;
                printf("\n");
            }
        }
        printf("\n");                      /* 打完一月应换行  */
    }
    return 0;
}

这是一个打印年历的程序

这个代码挺好的啊（初步测试）  输入一个年份  然后输入该年份的1月1日 是星期几？  然后就能打印

不知道你想问什么

现在已经解决了，