Notes for B2.1.3 How Programs Use Common Exception Handling Techniques - IB | RevisionDojo
B2.1.3 How Programs Use Common Exception Handling Techniques Notes
Exception Handling in Programs
Why Exception Handling Is Needed
Programs may fail due to:
Unexpected inputs (e.g., dividing by zero, invalid user entry).
Resource unavailability (e.g., file not found, network failure).
Logic errors (e.g., null references, array index out of bounds).
Without exception handling, programs may crash abruptly.
Hint
Always predict where code could fail and handle it gracefully.
Common Mistake
Relying only on testing: unexpected errors can still occur at runtime.
Exception Handling Constructs
Try / Catch (Java)
Code that might fail goes inside try.
Errors are caught in catch.
try{int x =10/0;}catch(ArithmeticException e){System.out.println("Cannot divide by zero");}
Hint
Catch specific exceptions instead of using a generic Exception.
Common Mistake
Putting all code in try block → makes debugging harder.
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Note
Introduction to Exception Handling
Exception handling is a mechanism that allows programs to deal with unexpected situations gracefully.
It helps prevent program crashes and provides meaningful error messages to users.
AnalogyThink of exception handling like a safety net for acrobats - it catches them when they fall, preventing serious injury.
DefinitionException HandlingA programming construct that allows developers to manage and respond to runtime errors or unexpected situations in a controlled manner.
ExampleWhen a user enters a letter instead of a number, exception handling can catch this error and prompt the user to enter a valid number instead of crashing the program.
