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;

}