用c语言农历

实现农历转换可以使用农历计算公式，下面是一个基于C语言的农历转换程序示例：

#include <stdio.h>

// 计算农历年的天数
int lunarYearDays(int year) {
    int i, sum = 348;
    for (i = 0x8000; i > 0x8; i >>= 1) {
        sum += ((0x59A5 >> i) & 1) ? 30 : 29;
    }
    return sum + leapMonthDays(year);
}

// 计算农历年闰月的天数
int leapMonthDays(int year) {
    if (leapMonth(year)) {
        return ((0x6000 >> (leapMonth(year) - 1)) & 1) ? 30 : 29;
    } else {
        return 0;
    }
}

// 计算农历年闰月是哪个月
int leapMonth(int year) {
    return (0x3000 >> 12) == 0xF ? 4 : ((0x3000 >> 13) == 0x7 ? ((0x6000 >> (12 - (0x3000 >> 12))) & 0xF) : 0);
}

// 计算农历年月份的天数
int lunarMonthDays(int year, int month) {
    return ((0x8000 >> month) & 1) ? 30 : 29;
}

int main() {
    int year, month, day, i;
    printf("请输入公历年月日: ");
    scanf("%d%d%d", &year, &month, &day);

    // 计算公历年当年元旦到计算日的天数
    int sum = 0;
    for (i = 1; i < month; i++) {
        switch(i) {
            case 2: sum += 28 + ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0); break;
            case 4:
            case 6:
            case 9:
            case 11: sum += 30; break;
            default: sum += 31; break;
        }
    }
    sum += day - 1;

    // 计算农历年月日
    int lunarYear, lunarMonth, lunarDay, leap = 0;
    for (i = 1900; i <= 2100 && sum > 0; i++) {
        int daysOfYear = lunarYearDays(i);
        sum -= daysOfYear;
    }
    if (sum < 0) {
        sum += lunarYearDays(--i);
    }
    lunarYear = i;
    leap = leapMonth(lunarYear); // 当年闰月是哪个月
    for (i = 1; i <= 12 && sum > 0; i++) {
        if (leap > 0 && i == (leap + 1) && sum == leapMonthDays(lunarYear)) {
            --i;
            leap = 0;
            lunarMonth = 0;
            lunarDay = 0;
            continue;
        }
        int daysOfMonth = lunarMonthDays(lunarYear, i);
        sum -= daysOfMonth;
    }
    if (sum < 0) {
        sum += lunarMonthDays(lunarYear, --i);
    }
    lunarMonth = i;
    lunarDay = sum + 1;

    printf("农历日期: %d年%d月%d日\n", lunarYear, lunarMonth, lunarDay);

    return 0;
}

该程序通过输入公历日期，计算出对应的农历年月日。其中，农历转换的计算公式参考了网络上的资料，具体实现细节可以查看代码注释。