异常的数字抛出，为什么会出现错误？（未解决）

#include <iostream>
using namespace std;

class A
{
public:
	A(int a, int b)
	{
		this->a = a;
		this->b = b;
		cout << "我是快乐的构造函数。\n";
	}
	~A()
	{
		cout << "我是无能的析构函数\n";
	}
protected:
private:
	int a;
	int b;

};

void divide()
{
	A a1(2, 4), a2(2, 6);
	throw 3;
}

int main()
{
	
	try
	{
		divide();
	}

	catch(...)
	{
		
	}

	system("pause");
}