在函数嵌套的情况下检测异常处理 try 和catch 以及throw

#include <iostream>
#include<cmath>
using namespace std;
int main()
{
	void f1();
	try
	{
		f1();
	}
	catch (double)
	{
		cout << "ERROR0" << endl;
		
	}
	cout << "end0" << endl;
	return 0;
}
void f1()
{
	void f2();
	try
	{
		f2();
	}
	catch (char)
	{
		cout << "ERROR1";
	}
	cout << "end1" << endl;
}
void f2()
{
	void f3();
	try
	{
		f3();
	}
	catch (int)
	{
		cout << "ERROR2";
	}
	cout << "end2" << endl;
}
void f3()
{
	double a = 0;
	try
	{
		throw a;
	}
	catch (float)
	{
		cout << "ERROR3" << endl;
	}
	cout << "end3" << endl;
	
}