IB Computer Science Topic 4.3.5 Algorithms with Loops and Branching Revision Notes (SL/HL)

IB Computer Science Topic 4.3.5 Algorithms with Loops and Branching Revision Notes (SL/HL) | RevisionDojo

Algorithms with Loops and Branching

What Are Loops and Branching?

Loops and branching are fundamental concepts in programming that allow algorithms to make decisions and repeat actions.
Loops are used to repeat a set of instructions multiple times.
Branching allows an algorithm to choose between different paths based on conditions.
These constructs help solve problems efficiently by reducing repetition and enabling dynamic behavior.

Analogy

Think of loops as a washing machine cycle that repeats until the clothes are clean, and branching as the decision to use hot or cold water based on the fabric type.

Note

More formal terms for loops and branching are iteration ans selection respectively.

Types of Loops

For Loops

For loops are used when the number of iterations is known in advance.
They are often used to iterate over a range of values or elements in a collection.

Example

Printing numbers from 1 to 5 using a for loop.

for i in range(1, 6):
  print(i)

Or in IB pseudocode:

loop I from 1 to 5
  output I
end loop

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Definition

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Note

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Excepteur sint occaecat cupidatat non proident

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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 nisi ut aliquip ex ea commodo consequat.

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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Algorithms with Loops and Branching

What Are Loops and Branching?

Loops and branching are fundamental concepts in programming that allow algorithms to make decisions and repeat actions.
Loops are used to repeat a set of instructions multiple times.
Branching allows an algorithm to choose between different paths based on conditions.
These constructs help solve problems efficiently by reducing repetition and enabling dynamic behavior.

Analogy

Think of loops as a washing machine cycle that repeats until the clothes are clean, and branching as the decision to use hot or cold water based on the fabric type.

Note

More formal terms for loops and branching are iteration ans selection respectively.

Types of Loops

For Loops

For loops are used when the number of iterations is known in advance.
They are often used to iterate over a range of values or elements in a collection.

Example

Printing numbers from 1 to 5 using a for loop.

for i in range(1, 6):
  print(i)

Or in IB pseudocode:

loop I from 1 to 5
  output I
end loop

Definition

Paywall

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

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

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.

IB Computer Science 4.3.5 Algorithms with Loops and Branching Notes

IB Computer Science 4.3.5 Algorithms with Loops and Branching Notes

Algorithms with Loops and Branching

What Are Loops and Branching?

Types of Loops

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Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Algorithms with Loops and Branching

What Are Loops and Branching?

Types of Loops

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Duis aute irure dolor in reprehenderit

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IB Computer Science 4.3.5 Algorithms with Loops and Branching Notes

1. System fundamentals2 subtopics

2. Computer organization1 subtopic

3. Networks1 subtopic

4. Computational thinking, problem-solving and programming3 subtopics

5. Abstract data structures (HL)1 subtopic

6. Resource management (HL)1 subtopic

7. Control (HL)1 subtopic

A. Databases4 subtopics

B. Modelling and simulation4 subtopics

C. Web science6 subtopics

D. Object-oriented programming (OOP)4 subtopics

IB Computer Science 4.3.5 Algorithms with Loops and Branching Notes

Algorithms with Loops and Branching

What Are Loops and Branching?

Types of Loops

Output

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

Algorithms with Loops and Branching

What Are Loops and Branching?

Types of Loops

Output

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

1. System fundamentals2 subtopics

2. Computer organization1 subtopic

3. Networks1 subtopic

4. Computational thinking, problem-solving and programming3 subtopics

5. Abstract data structures (HL)1 subtopic

6. Resource management (HL)1 subtopic

7. Control (HL)1 subtopic

A. Databases4 subtopics

B. Modelling and simulation4 subtopics

C. Web science6 subtopics

D. Object-oriented programming (OOP)4 subtopics