Programming Basics: Choose One Branch

Use a true-or-false condition to choose an action.

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IF checks a condition. In this pseudocode, IF points >= 5 THEN SHOW ready ELSE SHOW practice END runs exactly one branch. The symbol >= means greater than or equal to. SHOW only displays text.

Worked example

With points = 5, the condition points >= 5 is true, so ready is displayed. With points = 4 it is false, so practice is displayed. The equality case belongs in the true branch.

Check whether points is at least five. True displays ready; false displays practice. A value of exactly five takes the true branch.

Would you believe it?

A program can contain a branch that a particular run never uses. In an IF/ELSE, the condition selects one path, so different inputs can exercise different branches.

Python documentation: control flow

Question 1 For points = 5, what is displayed? practice Both words ready

Question 2 For points = 4, what is displayed? Nothing practice ready

Question 3 For points = 8, is points >= 5 true? Yes No Only sometimes

Question 4 How many branches run for one check of this IF/ELSE? Two Zero every time One

Question 5 Which input best checks the exact boundary? 500 5 50

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