COMP 110 Quiz 02

What does = mean?

Assignment (gives a variable a value)

Why is 18 = age invalid?

Can't assign to a number

What idea is in age = age + 1?

Reassignment using the old value

What happens with x = x + 1?

Updates x using its current value

If y = x and then y = y + 1, what's key?

Value is copied, not linked

After y = x, does changing x affect y?

No, y is already its own value

What does == mean (vs =)?

== checks equality, = assigns value

What does a while loop do?

Repeats code while the condition is True

Why is it called a 'loop'?

Program jumps back to the condition after each run

What must the while condition be?

A boolean expression

What happens when the condition is False?

Loop exits, next line after the loop runs

What happens if the condition is True?

Executes the loop block from the top

What happens after the last line in the loop block?

Goes back to check the condition again

Can anything go inside the loop block?

Yes: variables, print, if, even another while

How do you avoid an infinite loop?

Update something so the condition eventually becomes False

Is this correct for loops: 'make progress toward condition being True'?

No, must progress toward condition being False

Will the computer warn you about an infinite loop?

No, it'll run forever unless you stop it

Is 'if loop' correct terminology?

No, the correct term is 'while loop'

Can you use a while loop to go through a string?

Yes, use an index to go character-by-character

Should your counter be used as the index?

Yes, that's the typical method

What's the big benefit of loops?

Write small code that handles large data or repeated tasks