C++ :

#include <iostream>
using namespace std;
int main() {
    int month;
    cin >> month;
    switch (month) {
        case 1: cout << "一月"; break;
        case 2: cout << "二月"; break;
        case 3: cout << "三月"; break;
        case 4: cout << "四月"; break;
        case 5: cout << "五月"; break;
        case 6: cout << "六月"; break;
        case 7: cout << "七月"; break;
        case 8: cout << "八月"; break;
        case 9: cout << "九月"; break;
        case 10: cout << "十月"; break;
        case 11: cout << "十一月"; break;
        case 12: cout << "十二月"; break;
        default: cout << "无效的输入";
    }
    return 0;
}