TRY,CATCH AND THROW
An exception is a problem that arises during the execution
of a program. A C++ exception is a response to an exceptional
circumstance that arises while a program is running, such as
an attempt to divide by zero.
Exceptions provide a way to transfer control from one part
of a program to another. C++ exception handling is built
upon three keywords: try, catch, and throw.
• throw: A program throws an exception when a problem
shows up. This is done using a throw keyword.
• catch: A program catches an exception with an
exception handler at the place in a program where
you want to handle the problem. The catch keyword
indicates the catching of an exception.
• try: A try block identifies a block of code for
which particular exceptions will be activated.
It is followed by one or more catch blocks.
Assuming a block will raise an exception, a method
catches an exception using a combination of the try
and catch keywords. A try/catch block is placed
around the code that might generate an exception.
Code within a try/catch block is referred to as
protected code, and the syntax for using try/catch
is as follows:
try
{
// protected code
}catch( ExceptionName e1 )
{
// catch block
}catch( ExceptionName e2 )
{
// catch block
}catch( ExceptionName eN )
{
// catch block
}
