Question

In c++ code and test a function with prototype float except(int arg); that accepts an int argument and returns the expression 1.0 / arg if arg != 0; otherwise, except() throws an exception of type string. A suitable message might be “Error – attempt to divide by zero”.

Answer 1

Hi first of all let us Discuss about the Exception
As w know The Exception is nothing but Runtime Error occur at Runtime.that affects the Current Execution of a process
whih is abnormally terminates the certain Process,Like is an Object that wraps an Error Event that occured within a function.
To handle these type of Exceptions, we need apply apply the try followed by catch block.
Exception Handling is a Mechanism useful for handling the Runtime Errors.

->Actually an Error code Containing that block should be Kept in in Try Block.
Try Block will immediately follows the Certain Catch Block to catch the Exception that occur at Runtime.
Advantages of Exception Handling:-
==================================
The Main purpose of Using Exception Handling is to Error Detectio and Correction.
->Separating Error-Handling Code from "Regular" Code
-> We can Easily Identifying the Errors in a Program.

for Example, An array Containing the List/Sequence of an identical elements.Actually it accepts only a similar type of Elements.
Suppose Even if we enter Wrong input or Different.The Controller will continue to take input from the user.
Now we will go through your requirement,
please follow the below steps to implement to handle that type Exception.

c++ souce code:-
=================
#include<iostream>
using namespace std;
float except(int arg);
int main()
{
int arg;
float result;
cout<<"\n*** Exception demo ****"<<endl;
cout<<"\nPlease Enter any Integer value: ";
cin>>arg;
try
{
result=except(arg);
cout<<"The Return Value is"<<result<< endl;
}
catch (const char* msg)
{
cerr << msg << endl;
}
return 0;
}
float except(int arg)
{
if(arg!=0)
return 1.0;
else
throw "Error – attempt to divide by zero";
}
sample outputs:-
===================

*** Exception demo ****
Please Enter any Integer value: 12
The Return Value is1
--------------------------------
Process exited after 5.317 seconds with return value 0
Press any key to continue . . .





*** Exception demo ****
Please Enter any Integer value: 0
Error û attempt to divide by zero
--------------------------------
Process exited after 1.873 seconds with return value 0
Press any key to continue . . .



Another Example Source code:-
==============================
#include <iostream>
using namespace std;
class Exception
{
public:
Exception(string name)
{
}
public:
double division(int a, int b)
{
if(b==0)
{
throw "Exception:Division by zero condition!";
}
return (a/b);
}
public:
double multiplication(int a, int b)
{
if(a==0||b==0 )
{
throw "Exception:Multiply by zero condition!";
}
return (a*b);
}
public:
double Addition(int a, int b)
{
if(a>=255||b>=255)
{
throw "Exception:addition by Leading Value condition!";
}
return (a+b);
}
public:
double substraction(int a, int b)
{
if(a<0||b<0)
{
throw "Exception:Sustract by Negtive Value condition!";
}
return (a-b);
}
};
int main ()
{
Exception obj("Exception Handling Demonstration");
int n1,n2,opt;
double result=0;
try
{
while(1)
{
cout<<"------------------------------"<<endl;
cout<<"*******Exception Handling******"<<endl;
cout<<"1.Addition Of Numbers:"<<endl;
cout<<"2.Multiplication of Two Numbers:"<<endl;
cout<<"3.subtraction of Two Numbers:"<<endl;
cout<<"4.Division of Two Numbers:"<<endl;
cout<<"5.Exit"<<endl;
cout<<"Enter Any Two Numbers"<<endl;
cin>>n1>>n2;
cout<<"Select Any Operation:"<<endl;
cin>>opt;
switch(opt)
{
case 1:
try
{
result=obj.Addition(n1,n2);
cout <<"The Addition Value is"<<result<< endl;
}
catch (const char* msg)
{
cerr << msg << endl;
}
break;
case 2:
try
{
result=obj.multiplication(n1,n2);
cout <<"The Result is:"<<result<< endl;
}
catch (const char* msg)
{
cerr << msg << endl;
}
break;
case 3:
try
{
result=obj.substraction(n1,n2);
cout <<"The Result is:"<<result<< endl;
}
catch (const char* msg)
{
cerr << msg << endl;
}
break;
case 4:
try
{
result=obj.division(n1,n2);
cout <<"The Result is:"<<result<< endl;
}
catch (const char* msg)
{
cerr << msg << endl;
}
break;
case 5:
exit(0);
default:
cout<<"invalid Option"<<endl;
}

}
}
catch(const char*msg)
{
cout<<"Exception caught"<<endl;
}
return 0;
}