C++实现——由年月日推算是星期几

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#include <iostream>#include <string>#include <cmath>using namespace std;/*语法：result = weekday(int N, int M, int d)参数：N, M, d：年月日，例如：2003, 11, 4返回值：0：星期天，1星期一……注意：需要cmath适用于1582年10月15日之后, 因为罗马教皇格里高利十三世在这一天启用新历法.*///给定年月日，输出当天是星期几int weekday(int N, int M, int d){    int m, n, c, y, w;    m = (M - 2) % 12;    if (M >= 3) n = N; else n = N - 1;    c = n / 100;    y = n % 100;    w = (int)(d + floor(13 * m / 5) + y + floor(y / 4) + floor(c / 4) - 2 * c) % 7;    while (w<0) w += 7;    return w;}//测试函数int main(){    int year, month, day;    string week[] = {"日","一","二","三","四","五","六"};    while (cin >> year >> month >> day){        cout << year << "年" << month << "月" << day << "日是星期" << week[weekday(year, month, day)] << endl;    }}

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