Exception handling is a programming language construct or computer hardware mechanism designed to handle the occurrence of exceptions, special conditions that change the normal flow of program execution.
Programming languages differ considerably in their support for exception handling (as distinct from error checking, which is normal program flow that codes for responses to adverse contingencies such as invalid state changes or the unsuccessful termination of invoked operations.) In some programming languages there are functions which cannot be safely called on invalid input data ... or functions which return values which cannot be distinguished from exceptions—for example, in C the atoi (ASCII to integer conversion) function may return 0 (zero) for any input that cannot be parsed into a valid value. In such languages the programmer must either perform error checking (possibly through some auxiliary global variable such as C's errno) or input validation (perhaps using regular expressions).
The degree to which such explicit validation and error checking is necessary is in contrast to exception handling support provided by any given programming environment. Hardware exception handling differs somewhat from the support provided by software tools, but similar concepts and terminology are prevalent.
In general, an exception is handled (resolved) by saving the current state of execution in a predefined place and switching the execution to a specific subroutine known as an exception handler. Depending on the situation, the handler may later resume the execution at the original location using the saved information. For example, a page fault will usually allow the program to be resumed, while a division by zero might not be resolvable transparently.
----------------------------------------------------------------------------------------------A C++ PROGRAM TO IMPLEMENT EXCEPTION HANDLING IN QUEUE
COMPILER EMPLOYED: DEV C++ COMPILER-4.9.9.2 
SOURCE FILE SIZE :2 kb
EXE FILE SIZE :580 kb
NOTE: PLEASE INCLUDE THE DESIRED HEADER FILE
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C++ PROGRAM SOURCE & EXE DOWNLOAD:
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DISCLAIMER: The following program cannot be ensured of perfection.so any flaws in the program can be notified in the comments section.
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