【C/C++學院】0831

類與對象的異常

Cpp異常

#include 
#include 

using namespace std;

//標識錯誤的類型
class wrong  
{
};

int intdiv(int a, int b)
{
	try
	{	  
		if (b==0)
		{
			throw 10;//可以是任何對象  wrong();
		}
		int c = a / b;
		return c;
	}
	catch (int data )//類型名
	{		
		cout << "除法異常已經處理";
		return -1;
	}
}

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

void main()
{
	int x, y;
	cin >> x >> y;
	try
	{
		if (y==0)
		{
			throw "被除數為0";
		}
		else if (x==0)
		{
			throw "除數為0";
		}
	}
	catch (const char * s)
	{
		if (strcmp(s,"被除數為0")==0)
		{
			cout << "被除數為0異常，請重新輸入";
			cin >> x >> y;
		}
		else  if (strcmp(s, "除數為0") == 0)
		{
			cout << "除數為0異常，請重新輸入";
			cin >> x >> y;
		}
	}

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

類的異常

#include
using namespace std;

class wrong
{
};

class wrongA
{
};

class Array
{
public:
	Array(int num)
	{
		n = num;
		
		if (num<=0)
		{
			throw  wrong();
		}
		p = new int[num];//正確代碼在throw之後，不會被執行，
		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 << "下標越界";
	}
	catch (wrong  e)
	{
		cout << "程序發生異常，數組大小必須大於等於1";
	}

	cin.get();
}

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

#include
#include 

using namespace std;

class box   //正方體
{
public:
	box(int data) 
	{
		cout << "開始構造";
		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;//變長
};

void main()
{
	try
	{
		box newbox(0);
	}
	catch (box::zero w)
	{
	    if (w.errorcode==22)
	    {
			cout << "22號錯誤正方體長度不可以為0";
	    } 
	    else
	    {
			cout << "fei22號錯誤正方體長度不可以為0";
	    }		
	}
	catch (box::wrong)
	{
		cout << "正方體長度異常";
	}
	catch (box::big)
	{
		cout << "正方體長度太長";
	}
	catch (box::small)
	{
		cout << "正方體長度taiduan";
	}

	cin.get();
}

面試100題1-100

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