IB Digital Society Topic 3.2B Components of an Algorithm Revision Notes (SL/HL)

IB Digital Society Topic 3.2B Components of an Algorithm Revision Notes (SL/HL) | RevisionDojo

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3.2B Components of an Algorithm

The Building Blocks

Almost every algorithm is built from four components: instructions (perform a single step), variables (store values), conditionals (choose between paths), and loops (repeat steps).
You do not need to write code to spot them: the same components appear in a recipe, assembly instructions, or a bureaucratic form. The skill is seeing structure in any set of instructions.
Three combine into the control structures that shape flow: sequence (one step after another), selection (choosing with a conditional), and iteration (repeating with a loop). Variables run through all three.

Instructions and Sequence

The most basic component is the instruction: a single clear step telling the computer to do one thing (add two numbers, display a message). Carried out in order, instructions form a sequence.
Sequence matters because order changes the result: whisking eggs before cracking them makes no sense, and swapping two instructions can change the output completely. A list of steps in the right order is already a working algorithm.
1. A computer works through instructions one at a time and never improvises. A real program is a very long sequence, sometimes millions of steps, and each of those steps is an ordinary exact instruction like the ones above.

Example

Example

Instruction: a single step, like add 1 to the total.
Sequence: several instructions carried out in a fixed order.
Reordering the steps can change, or break, the result.

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Definition

Paywall

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Note

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Tip

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IB Digital Society 3.2B Components of an Algorithm Notes

3.2B Components of an Algorithm

The Building Blocks

Instructions and Sequence

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3.2B Components of an Algorithm

The Building Blocks

Instructions and Sequence

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Topic 1 - Introduction - Digital Society1 subtopic

Topic 2 - Concepts - Digital Society7 subtopics

Topic 3 - Content - Digital Society7 subtopics

Topic 4 - Contexts - Digital Society7 subtopics

Topic 5 - Challenges and Interventions - Digital Society (HL)3 subtopics

IB Digital Society 3.2B Components of an Algorithm Notes

Topic 1 - Introduction - Digital Society1 subtopic

Topic 2 - Concepts - Digital Society7 subtopics

Topic 3 - Content - Digital Society7 subtopics

Topic 4 - Contexts - Digital Society7 subtopics

Topic 5 - Challenges and Interventions - Digital Society (HL)3 subtopics

3.2B Components of an Algorithm

The Building Blocks

Instructions and Sequence

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

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3.2B Components of an Algorithm

The Building Blocks

Instructions and Sequence

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

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