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 ==0)

		{

			zero z1;

			z1.errorcode = 212;

			throw z1;

		}

		else if ( data >0 && data<100)

		{

			throw small();

		}

		else  if (data>10000)

		{

			throw big();

		}

		else if (data>100 && data<10000)

		{

			a = data;

		}

		else

		{

			throw wrong{};

		}

	}

    int  gettiji()

	{

		 return  a*a*a;

	}

	class zero

	{

	public:

		int errorcode;

	};

	class wrong{};

	class big{};

	class small{};

private:

	int a;//变长

};

void main()

{

	try

	{

		box newbox(0);

	}

	catch (box::zero w)

	{

	    if (w.errorcode==22)

	    {

			cout << "22号错误正方体长度不能够为0";

	    }

	    else

	    {

			cout << "fei22号错误正方体长度不能够为0";

	    }

	}

	catch (box::wrong)

	{

		cout << "正方体长度异常";

	}

	catch (box::big)

	{

		cout << "正方体长度太长";

	}

	catch (box::small)

	{

		cout << "正方体长度taiduan";

	}

	cin.get();

}

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