C++基于蔡基姆拉尔森计算公式实现由年月日确定周几的方法示例

#include <iostream>#include <string>using namespace std;int whatday(int y, int m, int d) {  // 返回正确的星期。用 0 - 6 表示 星期 1 - 7  if(m==1||m==2)  {    y--;    m+=12;  }  return(d+2*m+3*(m+1)/5+y+y/4-y/100+y/400)%7;}string weekday[7] = {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};int main() {  int y, m, d;  cin >> y >> m >> d;  cout << weekday[whatday(y, m, d)] << endl;  return 0;}