PPL: Exception Handling

C++ Exception Handling

#include < iostream.h>
using namespace std;

void main()
{
int x,y;
cout<<"Enter the value of x:";
cin>>a>>b;

cout<<"Enter the value of y:";
cin>>b;

try
{
if(y!=0)
{
cout<<"Result=" << x/y;
}
else
{
throw(y);
}
catch(int ex)
{
cout<<"Caught an exception which is:" << y ;
           }
}
}

OUTPUT:
Enter the value of a:
4
Enter the value of b;
0

Caught an exception which is:0

First we should know what is exception handling?
Ans. When in a program a situation occurred when program is not able to take decision or result is out of control. Than such conditions are needed to be handled to prevent our program. The reason behind such conditions is known as exceptions.

Some of the examples of exceptions are:
  • When divided by zero(o), which is an exception.
  • When doing operation of a number with a character, is also an exception.
  • Pressing a login button may time after entering credentials, could also be an exception.

So, for handling exceptions in a program which may be in C++, JAVA etc. Concept of exception handling is used.

In exception handling, try and catch blocks are used. In try, throw is also used.

The try block will execute the program, and if any exception occurs it will throw the exception and program control will entered into catch block.

The try block is always used to execute the program and catch block will always handled the exceptions thrown by try block.


MCQs on Exception Handling

Q1. The class at the top of exception class hierarchy is __________.
A. Arithmetic exception  
B. Throwable   
C. Object    
D. Exception

MCQs Answers

Q1. (B)

Principles of Programming Languages

EasyExamNotes.com covered following topics in PPL.

Practicals:
Previous years solved papers:
A list of Video lectures
References:
  1. Sebesta,”Concept of programming Language”, Pearson Edu 
  2. Louden, “Programming Languages: Principles & Practices” , Cengage Learning 
  3. Tucker, “Programming Languages: Principles and paradigms “, Tata McGraw –Hill. 
  4. E Horowitz, "Programming Languages", 2nd Edition, Addison Wesley

Python Programming ↓ 👆
Java Programming ↓ 👆
JAVA EasyExamNotes.com covered following topics in these notes.
JAVA Programs
Principles of Programming Languages ↓ 👆
Principles of Programming Languages
EasyExamNotes.com covered following topics in these notes.

Practicals:
Previous years solved papers:
A list of Video lectures References:
  1. Sebesta,”Concept of programming Language”, Pearson Edu 
  2. Louden, “Programming Languages: Principles & Practices” , Cengage Learning 
  3. Tucker, “Programming Languages: Principles and paradigms “, Tata McGraw –Hill. 
  4. E Horowitz, "Programming Languages", 2nd Edition, Addison Wesley

    Computer Organization and Architecture ↓ 👆

    Computer Organization and Architecture 

    EasyExamNotes.com covered following topics in these notes.

    1. Structure of desktop computers
    2. Logic gates
    3. Register organization
    4. Bus structure
    5. Addressing modes
    6. Register transfer language
    7. Direct mapping numericals
    8. Register in Assembly Language Programming
    9. Arrays in Assembly Language Programming

    References:

    1. William stalling ,“Computer Architecture and Organization” PHI
    2. Morris Mano , “Computer System Organization ”PHI

    Computer Network ↓ 👆
    Computer Network

    EasyExamNotes.com covered following topics in these notes.
    1. Data Link Layer
    2. Framing
    3. Byte count framing method
    4. Flag bytes with byte stuffing framing method
    5. Flag bits with bit stuffing framing method
    6. Physical layer coding violations framing method
    7. Error control in data link layer
    8. Stop and Wait scheme
    9. Sliding Window Protocol
    10. One bit sliding window protocol
    11. A protocol Using Go-Back-N
    12. Selective repeat protocol
    13. Application layer
    References:
    1. Andrew S. Tanenbaum, David J. Wetherall, “Computer Networks” Pearson Education.
    2. Douglas E Comer, “Internetworking with TCP/IP Principles, Protocols, And Architecture",Pearson Education
    3. KavehPahlavan, Prashant Krishnamurthy, “Networking Fundamentals”, Wiley Publication.
    4. Ying-Dar Lin, Ren-Hung Hwang, Fred Baker, “Computer Networks: An Open Source Approach”, McGraw Hill.