c 语言 编写万年历程序，输入年、月，输出该月的日历表。输入年，输出该年的日历表。

好的，以下是一份C语言代码，可以实现输入年、月份，输出该月的日历表：

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

int get_weekday(int year, int month, int day)
{
    int h;
    int q = day;
    int m = month;
    int K = year % 100;
    int J = year / 100;

    h = (q + 13 * (m + 1) / 5 + K + K / 4 + J / 4 + 5 * J) % 7;
    return h;
}

bool is_leap_year(int year)
{
    if (year % 4 == 0 && year % 100 != 0)
        return true;
    else if (year % 400 == 0)
        return true;
    else
        return false;
}

void print_month_calendar(int year, int month)
{
    int days_in_month[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    char *month_name[] = {"", "January", "February", "March", "April", "May", "June", 
                          "July", "August", "September", "October", "November", "December"};

    if (month == 2 && is_leap_year(year))
        days_in_month[2]++;

    int first_day = get_weekday(year, month, 1);

    printf("%s %d\n", month_name[month], year);
    printf("Mo Tu We Th Fr Sa Su\n");

    int day_counter = 1;

    for (int i = 0; i < 6; i++) {
        for (int j = 0; j < 7; j++) {
            if (i == 0 && j < first_day)
                printf("   ");
            else if (day_counter > days_in_month[month])
                printf("   ");
            else
                printf("%2d ", day_counter++); 
        }
        printf("\n");
    }
}

void print_year_calendar(int year)
{
    for (int i = 1; i <= 12; i++) {
        print_month_calendar(year, i);
        printf("\n");
    }
}

int main()
{
    int year, month;

    printf("请输入年份：");
    scanf("%d", &year);

    printf("请输入月份：");
    scanf("%d", &month);

    if (month >= 1 && month <= 12)
        print_month_calendar(year, month);
    else {
        printf("月份输入有误，请输入1-12之间的数字！\n");
        exit(EXIT_FAILURE);
    }

    return 0;
}

这个程序使用了与Python代码相同的蔡勒公式来计算星期几，使用了一个数组来存储每个月的天数，使用了一个字符串数组来存储月份名称。在打印日历的过程中，我们可以使用两层循环，外层循环是6行（一个月中最多只有6行），内层循环是7列（一周有七天）。

如果您需要输出某一年的日历表，可以使用以下代码：

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

int get_weekday(int year, int month, int day)
{
    int h;
    int q = day;
    int m = month;
    int K = year % 100;
    int J = year / 100;

    h = (q + 13 * (m + 1) / 5 + K + K / 4 + J / 4 + 5 * J) % 7;
    return h;
}

bool is_leap_year(int year)
{
    if (year % 4 == 0 && year % 100 != 0)
        return true;
    else if (year % 400 == 0)
        return true;
    else
        return false;
}

void print_month_calendar(int year, int month)
{
    int days_in_month[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    char *month_name[] = {"", "January", "February", "March", "April", "May", "June", 
                          "July", "August", "September", "October", "November", "December"};

    if (month == 2 && is_leap_year(year))
        days_in_month[2]++;

    int first_day = get_weekday(year, month, 1);

    printf("%s %d\n", month_name[month], year);
    printf("Mo Tu We Th Fr Sa Su\n");

    int day_counter = 1;

    for (int i = 0; i < 6; i++) {
        for (int j = 0; j < 7; j++) {
            if (i == 0 && j < first_day)
                printf("   ");
            else if (day_counter > days_in_month[month])
                printf("   ");
            else
                printf("%2d ", day_counter++); 
        }
        printf("\n");
    }
}

void print_year_calendar(int year)
{
    for (int i = 1; i <= 12; i++) {
        print_month_calendar(year, i);
        printf("\n");
    }
}

int main()
{
    int year;

    printf("请输入年份：");
    scanf("%d", &year);

    print_year_calendar(year);

    return 0;
}

这个程序使用了一个循环，从1到12输出每个月的日历。通过这个程序，您就可以实现一个简单的万年历啦！