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In programming and computer science, an exception is an unexpected or abnormal event that disrupts the normal flow of a program’s execution. Exceptions are typically caused by runtime errors such as division by zero, file not found, invalid input, or out-of-bounds array access. They allow programs to handle errors gracefully instead of crashing abruptly.

Core Characteristics

1. Event Nature: It is a runtime occurrence, not a compile-time error (compile-time errors are detected before the program runs, while exceptions happen during execution).
2. Disruption of Normal Flow: When an exception is triggered, the program’s regular execution path is interrupted, and the system looks for an exception handler to resolve the issue.
3. Handlability: Properly designed programs use exception handling mechanisms (e.g., try-catch blocks in many languages) to catch and resolve exceptions, ensuring program stability.

Common Exception Handling Mechanisms (Cross-Language)

Language	Key Keywords/Constructs	Example Snippet
Java/C#	try, catch, finally, throw	try { int x = 5 / 0; } catch (ArithmeticException e) { e.printStackTrace(); }
Python	try, except, finally, raise	try: x = 5 / 0 except ZeroDivisionError as e: print(e)
C++	try, catch, throw	try { throw std::runtime_error("Error"); } catch (std::exception &e) { std::cout << e.what(); }

Common Types of Exceptions

• ArithmeticException: Triggered by illegal arithmetic operations (e.g., division by zero).
• NullPointerException: Occurs when a program attempts to access a member of a null object reference (common in Java/C#).
• FileNotFoundException: Raised when trying to open a file that does not exist.
• IndexOutOfBoundsException: Happens when accessing an array or collection element with an invalid index.

Difference from Error

In some languages (e.g., Java), exception and error are distinct concepts:

Error: Represents unrecoverable system-level issues (e.g., OutOfMemoryError, StackOverflowError), which are usually not caught in application code.

Exception: Represents recoverable errors (can be caught and handled, e.g., IOException).

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