What is the difference between error handling via exceptions and without using exceptions in a program?

Error handling with exceptions and without them (e.g., through error codes) differs in approach and convenience:

1. Handling via exceptions:

   • Exceptions allow separating the main code from error handling code.
   • When an error occurs, an exception is thrown, which can be caught and handled elsewhere.
   • Simplifies reading and maintaining code, especially with deep call nesting.
   • However, it may have performance overhead.

2. Handling without exceptions (using error codes):

   • Functions return special codes or values indicating an error.
   • Requires explicit checking of the result after each call.
   • Can lead to more verbose and less readable code.
   • Allows more precise control over the execution flow and avoids exception overhead.

Example in C++ without exceptions:

int result = doSomething();
if (result != 0) {
    // handle error
}

With exceptions:

try {
    doSomething();
} catch (const std::exception& e) {
    // handle error
}

The choice of approach depends on performance requirements, readability, and program architecture.