打表法

#include <iostream>
#include <string>

int main() {
    int day;
    std::cin >> day;

    std::string dayName;

    switch (day) {
        case 1:
            dayName = "Monday";
            break;
        case 2:
            dayName = "Tuesday";
            break;
        case 3:
            dayName = "Wednesday";
            break;
        case 4:
            dayName = "Thursday";
            break;
        case 5:
            dayName = "Friday";
            break;
        case 6:
            dayName = "Saturday";
            break;
        case 7:
            dayName = "Sunday";
            break;
        default:
            dayName = "No";
    }

    std::cout << dayName << std::endl;

    return 0;
}