try catch異常處理例子

以下是看Think in C++而寫的測試例子

#include <iostream>
using namespace std;

class MyErr
{
private:
	const char* const data;
public:
	MyErr(const char* const msg = 0):data(msg){}
	void show(){cout << data <<endl;}
};

void foo()
{
	int i;
	cout << "輸入一個大於0小於8的整數:";
	cin >> i;
	if(i < 0)
		throw MyErr("輸入不大於0");
	else if(i >= 8)
		throw MyErr("輸入不小於8");

	cout << "ok" <<endl;
}

void foo2()
{
	foo();
}

int main(int argc, char *argv[])
{
	try
	{
		foo2();
	}
	catch(MyErr &e)
	{
		e.show();
	}

	return 0;
}