EXCEPTION HANDLING

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EXCEPTION HANDLING

• COURSE MSc Computers and Network engineering.
• Name Kirthidhar Gandham
• Module Object Oriented Methods (16-7213)
• Module Leader Prof. Alan goude
• Deadline date 3/04/08
• Student id 16031803

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• Before lets get talking about the concept of
  exception handling in c let us discuss some
  topics like what is an exception why we use
  exception handlers in c
• What are different types of exceptions and what
  are the keywords that we use for exception
  handling mechanism

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What is an Exception?

• When we write a simple c program the first
  thing that we see when a program doesnt work
  correctly are bugs most common bugs are logical
  errors and syntactic errors but we can overcome
  these bugs by debugging but sometimes we come
  across some problems other than logical or syntax
  errors. These are known as Exceptions.

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• Exceptions are unusual conditions which occur at
  runtime like low disk space, division by zero,
  access to array outside its bounds to overcome
  these anomalies Exception handling concept plays
  a major role in c
• Exceptions are of two types they are synchronous
  exceptions and asynchronous exceptions errors
  like out of range index or overflow come under
  synchronous exceptions and errors which are
  beyond the program like keyboard interrupts are
  called as asynchronous exceptions

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• Exception handling performs the following tasks
• Finding the problem (Hit the exception).
• Inform an error is occurred (Throw an exception).
• Receive error information (Catch the exception).
• Correct it (Handle the exception).

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• The keywords which are mainly used for exception
  handing mechanism are try, throw and catch.
• Usually exceptions are thrown by functions which
  are invoked from try blocks and the point at
  which the throw is executed is called throw
  point. Once an exception is thrown to catch
  block, control cannot return to throw point.
• General format code for this is
• throw(object) //throws exception
• ..
• try
• . //invoke function
• catch(type arg)//catches exception
• . //handles exception

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• These are the basic steps to write a c program
  using exception handling mechanism the program
  which shows the code is attached to this power
  point presentation separately in a word document.

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• References
• Lecture notes given in class and examples given
  in module site.
• Object oriented programming through c by
  B.chandra.
• C how to program by paul dietel and harvey
  dietel.
• C A beginners guide by herbert schildt.
• The c standard library by nicolai M josuttis.