Back to Topic 5.1 — Computational thinking
5.1.4Computer Science SL5 flashcards

Tracing flowcharts

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Card 1 of 55.1.4
5.1.4
Question

What are the standard flowchart symbols?

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All 5 Flashcards — Tracing flowcharts

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Card 1definition

Question

What are the standard flowchart symbols?

Answer

Rounded box for Start/End, slanted box for Input/Output, rectangle for Process, diamond for Decision with two labelled exits, arrow for Flowline, and a small circle for Connector.

Card 2concept

Question

How is a loop shown on a flowchart?

Answer

There is no loop symbol. A loop is a decision diamond with a flowline going back up to it — follow the arrows and the loop is obvious.

Card 3process

Question

How do you trace a flowchart reliably?

Answer

Draw the table first with one column per variable plus output; write a new row for every change; write the comparison out in full at every diamond; and add to the output column only when an output box is reached.

Card 4concept

Question

What is the commonest tracing error?

Answer

The boundary case. When the test is 'count at most N', the loop still runs when the two values are equal — one more time than most people expect.

Card 5definition

Question

How many exits does a decision symbol have?

Answer

Exactly two, labelled Yes and No. A diamond drawn with one exit or with three is drawn incorrectly.

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