#include <iostream> using namespace std; int YearToMonth(int year); //函數宣告,應放在main函數之前 int main() { int input; cout << "請輸入年齡:"; cin >> input; cout << endl; cout << "換算成月份是:" << YearToMonth(input) << "月" << endl; return 0; } int YearToMonth(int year) //函數定義,建議放在main函數後 { return year*12; }