W3School TIY Editor

#include <iostream> using namespace std; int main() { try { int age = 20; if (age >= 18) { cout << "访问已授权 - 您已满 18 岁。"; } else { throw (age); } } catch (int myNum) { cout << "访问被拒绝 - 您必须年满 18 岁。\n"; cout << "年龄是: " << myNum; } return 0; }