Runtime error handling in Compiler Design - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a runtime error?

A runtime error is a problem that occurs while a program is running, causing it to stop or behave unexpectedly. It happens after the program has successfully compiled.

beginner

Why is runtime error handling important?

Runtime error handling helps programs detect and manage errors during execution, preventing crashes and allowing the program to respond gracefully or recover.

beginner

Name two common types of runtime errors.

Two common runtime errors are division by zero and accessing invalid memory (like null pointer errors).

intermediate

How does a runtime error handler work in a program?

A runtime error handler detects errors during program execution, then takes actions like showing error messages, stopping the program safely, or trying to fix the problem.

beginner

What is the difference between compile-time errors and runtime errors?

Compile-time errors are found by the compiler before running the program, like syntax mistakes. Runtime errors happen while the program runs, like dividing by zero.

When do runtime errors occur?

A While the program is running

B During compilation

C Before writing code

D After program termination

Runtime errors happen during the execution of the program, not before or after.

Which of the following is an example of a runtime error?

A Division by zero

B Syntax error

C Missing semicolon

D Incorrect variable declaration

Division by zero is a runtime error because it happens when the program runs.

What is the main goal of runtime error handling?

A To detect errors before running the program

B To fix errors in the source code

C To manage errors during program execution

D To speed up compilation

Runtime error handling manages errors that occur while the program is running.

Which of these is NOT a runtime error?

A Array index out of bounds

B Syntax error

C Null pointer access

D Stack overflow

Syntax errors are compile-time errors, not runtime errors.

How can a program respond to a runtime error?

A Ignore it and continue silently

B Change the source code automatically

C Restart the computer

D Show an error message and stop safely

Programs usually show an error message and stop safely or try to recover when a runtime error occurs.

Explain what runtime error handling is and why it is necessary in programs.

Think about what happens when a program encounters a problem while running.

Describe the difference between compile-time errors and runtime errors with examples.

Consider when the error is found: before running or during running the program.