Explain. Exception handling with example.

Exception handling is a mechanism in programming to handle runtime errors, so that normal flow of the program can be maintained. It is a process to handle the runtime errors so that normal flow of the application can be maintained.

Here is a simple example in Python:

try:
    # code block where exception can occur
    a = 1
    b = "s"
    c = a + b
except Exception as e:
    # what to do when exception occurred, print error message
    print("An error occurred. Error message: ", str(e))

In this example, we are trying to add a string to an integer, which will raise a TypeError. This error is caught in the except block and a custom error message is printed.

Here's how it works:

1. The code within the try block is executed statement by statement.
2. If no exception occurs, the except block is skipped and execution of the try statement is finished.
3. If an exception occurs during execution of the try block, the rest of the block is skipped. Then if its type matches the exception named after the except keyword, the except block is executed, and then execution continues after the try statement.
4. If an exception occurs which does not match the exception named in the except clause, it is passed on to outer try statements; if no handler is found, it is an unhandled exception and execution stops with a message as shown above.

Exception handling is a mechanism in programming to handle runtime errors, so that normal flow of the program can be maintained. It is a process to handle the runtime errors so that normal flow of the application can be maintained.

Here is a simple example in Python:

try:
    # code block where exception can occur
    a = 1
    b = "s"
    c = a + b
except Exception as e:
    # what to do in case of exception
    print("An error occurred: ", e)

In this example, we are trying to add a string to an integer, which will raise a TypeError. This error is caught by the except block, and a message is printed to the console.

Here's how it works:

1. The code within the try block is executed statement by statement.
2. If no exception occurs, the except block is skipped and execution of the try statement is finished.
3. If an exception occurs during execution of the try block, the rest of the block is skipped. Then if its type matches the exception named after the except keyword, the except block is executed, and then execution continues after the try statement.
4. If an exception occurs which does not match the exception named in the except clause, it is passed on to outer try statements; if no handler is found, it is an unhandled exception and execution stops with a message as shown above.