W3School TIY Editor

#include <iostream> using namespace std; int main() { int age = 20; bool isCitizen = true; if (age >= 18) { cout << "已达到投票年龄。\n"; if (isCitizen) { cout << "并且您是公民，所以可以投票！\n"; } else { cout << "但您必须是公民才能投票。\n"; } } else { cout << "未达到投票年龄。\n"; } return 0; }