IB Computer Science Topic B2.1.4 Constructing and Using Common Debugging Techniques Revision Notes (SL/HL)

IB Computer Science Topic B2.1.4 Constructing and Using Common Debugging Techniques Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

The Importance of Debugging

Debugging is the process of identifying and fixing errors in your code.
It ensures that your program behaves as expected and is a critical skill for any programmer.

Note

Debugging is not just about fixing errors, it's about understanding how your code works and improving its overall quality.

Common Debugging Techniques

Trace Tables
Breakpoint Debugging
Print Statements
Step-by-Step Code Execution

Tip

When debugging, always start by identifying the type of error: syntax, runtime, or logic.
This will guide you in choosing the most effective debugging technique.

Trace Tables

Trace tables are used to manually track the values of variables as an algorithm executes.
They help identify logic errors by showing how data changes over time.

Example

Counting Warm Days

Consider the following Python code that counts the number of warm days (temperatures above 20°C):

Iteration	Value of temp	warmDays
1	23.7	1
2	19.9	1
3	23.8	2
4	18.8	2
5	12.5	2
6	24.0	3

Note

Trace tables are especially useful for understanding loops and conditional statements, where variable values change frequently.

Breakpoint Debugging

Breakpoints are markers set in your code that pause execution at specific points.

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Note

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Tip

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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The Importance of Debugging

Debugging is the process of identifying and fixing errors in your code.
It ensures that your program behaves as expected and is a critical skill for any programmer.

Note

Debugging is not just about fixing errors, it's about understanding how your code works and improving its overall quality.

Common Debugging Techniques

Trace Tables
Breakpoint Debugging
Print Statements
Step-by-Step Code Execution

Tip

When debugging, always start by identifying the type of error: syntax, runtime, or logic.
This will guide you in choosing the most effective debugging technique.

Trace Tables

Trace tables are used to manually track the values of variables as an algorithm executes.
They help identify logic errors by showing how data changes over time.

Example

Counting Warm Days

Consider the following Python code that counts the number of warm days (temperatures above 20°C):

Iteration	Value of temp	warmDays
1	23.7	1
2	19.9	1
3	23.8	2
4	18.8	2
5	12.5	2
6	24.0	3

Note

Trace tables are especially useful for understanding loops and conditional statements, where variable values change frequently.

Breakpoint Debugging

Breakpoints are markers set in your code that pause execution at specific points.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A1 Computer fundamentals4 subtopics

A2 Networks4 subtopics

A3 Databases4 subtopics

A4 Machine learning4 subtopics

B1 Computational thinking1 subtopic

B2 Programming5 subtopics

B3 Object-oriented programming2 subtopics

B4 Abstract data types (HL only)1 subtopic

IB Computer Science Topic B2.1.4: Constructing and Using Common Debugging Techniques Notes

A1 Computer fundamentals4 subtopics

A2 Networks4 subtopics

A3 Databases4 subtopics

A4 Machine learning4 subtopics

B1 Computational thinking1 subtopic

B2 Programming5 subtopics

B3 Object-oriented programming2 subtopics

B4 Abstract data types (HL only)1 subtopic

The Importance of Debugging

Common Debugging Techniques

Trace Tables

Counting Warm Days

Breakpoint Debugging

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

The Importance of Debugging

Common Debugging Techniques

Trace Tables

Counting Warm Days

Breakpoint Debugging

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account