Easy: there is no exception-handling in C.

interrupt handling is the process of handling a break or interrupt called by a program where as exception handling is for handling some exceptional conditions that'll occur when a program is running

Exception handling is necessary for string handling as there might be some unexpected situation during string handling which may lead to program crash or abrupt termination

An exception is abnormal program flow, so handling the exception is the very definition of resolving the abnormality.

We use exception handling so that the program can gracefully handle any situation that may be unexpected.

We use try-catch for exception handling.

if-else is a conditional logic checking mechanism