萌新问问C语言，作业不会做

#include<iostream>
using namespace std;
int main()
{
    int week;
    string week_str = "";
    std::cout << "Input week(1~7):"<<std::endl;

    bool again = true;
    while (again) {
        again = false;
        std::cin >> week;
        switch (week) {
        case 1:
            week_str = "Monday";
            break;
        case 2:
            week_str = "Tuesday";
            break;
        case 3:
            week_str = "Wednesday";
            break;
        case 4:
            week_str = "Thursday";
            break;
        case 5:
            week_str = "Friday";
            break;
        case 6:
            week_str = "Saturday";
            break;
        case 7:
            week_str = "Sunday";
            break;
        default:
        {
            week_str = "Incorrect input,please try again";
            again = true;
            break;
        }
        }
        std::cout << week_str << std::endl;
    }

    return 0;
}

C和C++完整教程：https://blog.csdn.net/it_xiangqiang/category_10581430.html