If-elseif-else statements in MATLAB - Cheat Sheet & Quick Revision

Recall & Review

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What is the purpose of an if statement in MATLAB?

An if statement lets the program choose to run some code only if a certain condition is true.

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How do you write an elseif in MATLAB?

You write elseif followed by a condition, to check another case if the first if condition was false.

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What does the else part do in an if-elseif-else block?

The else part runs code only if all previous if and elseif conditions were false.

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Write a simple MATLAB if-elseif-else structure to check if a number x is positive, zero, or negative.

if x > 0 disp('Positive') elseif x == 0 disp('Zero') else disp('Negative') end

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Why do you need to end an if-elseif-else block with end in MATLAB?

The end tells MATLAB where the conditional block finishes, so it knows which code belongs to the condition.

What happens if the if condition is true in an if-elseif-else block?

A Only the <code>if</code> block runs, and the rest are skipped.

B All blocks run regardless of conditions.

C Only the <code>else</code> block runs.

D The program stops running.

When the if condition is true, MATLAB runs that block and skips the elseif and else blocks.

Which keyword checks another condition if the first if is false?

A elseif

B else

C end

D switch

elseif lets you check a new condition if the previous if was false.

What does the else block do?

A Runs before the <code>if</code> block.

B Runs only if the first <code>if</code> is true.

C Runs only if <code>elseif</code> is true.

D Runs if all previous conditions are false.

The else block runs only when all if and elseif conditions are false.

What keyword ends an if-elseif-else block in MATLAB?

A stop

B end

C finish

D close

The end keyword marks the end of the conditional block.

Which of these is a correct way to start an if statement in MATLAB?

A if x > 0

B if (x > 0)

C if x > 0 then

D if x > 0 do

In MATLAB, you write if x > 0 or if (x > 0) without extra words like 'then' or 'do'.

Explain how an if-elseif-else statement works in MATLAB using a real-life example.

Think about choosing what to wear based on weather.

Write a MATLAB code snippet using if-elseif-else to check if a number is positive, zero, or negative.

Use > 0, == 0, and else for conditions.