W3School TIY Editor

#include <iostream> #include <map> using namespace std; int main() { // 创建存储不同人员姓名和年龄的映射表 map<string, int> people = { {"Bill", 19}, {"Steve", 32}, {"Elon", 26} }; // 尝试访问不存在的元素(会抛出异常) cout << people.at("Jack"); return 0; }