W3School TIY Editor

#include <iostream> #include <map> using namespace std; int main() { map<string, int> people = { {"Bill", 19}, {"Steve", 32}, {"Elon", 26} }; // 添加新元素 people["Jack"] = 23; people["John"] = 25; people["Percy"] = 18; people["Alfred"] = 36; cout << "Jack 的年龄是: " << people.at("Jack") << "\n"; cout << "Percy 的年龄是: " << people.at("Percy") << "\n"; return 0; }