#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    n%=7;
    n++;
    if(n==1)cout<<"monday";
    if(n==2)cout<<"tuesday";
    if(n==3)cout<<"wednesday";
    if(n==4)cout<<"thursday";
    if(n==5)cout<<"friday";
    if(n==6)cout<<"saturday";
    if(n==7)cout<<"sunday";
    return 0;
}

计算日期

看了答案

#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
cin>>n;
n%=7;
n++;
if(n1)cout<<"monday";
if(n2)cout<<"tu