类与对象的异常

Cpp异常

#include <iostream>
#include <string.h>

using namespace std;

//标识错误的类型
class wrong  
{
};

int intdiv(int a, int b)
{
	try
	{	  
		if (b==0)
		{
			throw 10;//能够是不论什么对象  wrong();
		}
		int c = a / b;
		return c;
	}
	catch (int data )//类型名
	{		
		cout << "除法异常已经处理";
		return -1;
	}
}

int intdivA(int a, int b)
{
	return a / b;
}

void main()
{
	int x, y;
	cin >> x >> y;
	try
	{
		if (y==0)
		{
			throw "被除数为0";
		}
		else if (x==0)
		{
			throw "除数为0";
		}
	}
	catch (const char * s)
	{
		if (strcmp(s,"被除数为0")==0)
		{
			cout << "被除数为0异常，请又一次输入";
			cin >> x >> y;
		}
		else  if (strcmp(s, "除数为0") == 0)
		{
			cout << "除数为0异常，请又一次输入";
			cin >> x >> y;
		}
	}

	std::cout << intdiv(x, y);
	cin.get();
	cin.get();
	cin.get();
}

类的异常

#include<iostream>
using namespace std;

class wrong
{
};

class wrongA
{
};

class Array
{
public:
	Array(int num)
	{
		n = num;
		
		if (num<=0)
		{
			throw  wrong();
		}
		p = new int[num];//正确代码在throw之后。不会被运行。
		for (int i = 0; i < num;i++)
		{
			p[i] = 0;
		}
	}

	int & operator[](int num)
	{
		if (num < 0 || num>= n)
		{
			throw wrongA();
		}
		return p[num];
	}
protected:
private:
	int *p;
	int n;
};

void main()
{
	try
	{
		Array myarrar(2);
		myarrar[-1];
	}
	catch (wrongA  e)
	{		
		cout << "下标越界";
	}
	catch (wrong  e)
	{
		cout << "程序发生异常，数组大小必须大于等于1";
	}

	cin.get();
}

void mainA()
{
	int a[3] = { 1, 2, 3 };
//	printf("%d", 2[a]);//*(2+a)
//	printf("%d", a[9886655]);
	getchar();
}

#include<iostream>
#include <string>

using namespace std;

class box   //正方体
{
public:
	box(int data) 
	{
		cout << "開始构造";
		if (data =http://www.mamicode.com/=0)>
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