# FAQ: Functions and Operations - Conditionals

This community-built FAQ covers the “Conditionals” exercise from the lesson “Functions and Operations”.

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This exercise can be found in the following Codecademy content:

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In the following SASS exercise, how does the code differentiate between the odd and even numbers?
width: if(\$i % 2 == 0, 300px, 350px);
margin-left: if(\$i % 2 == 0, 0px, 50px);

Thanks

The modulo operator ‘%’ is used to differentiate between odd and even numbers.
Every even number divided by 2 has a remainder equal to 0.
For example: 4 mod 2 = 0, and in code it works the same, but modulo has its own symbol ‘%’: 4 % 2 = 0.
Uneven numbers don’t have a remainder equal to 0, so e.g.: 5 % 2 = 1.

``````width: if(\$i % 2 == 0, 300px, 350px);
``````

So, basically:

``````width: if( \$condition, \$value-if-true, \$value-if-false);
``````

Even numbers evaluate to true, and uneven to false.

2 Likes

Keep getting this error even when I paste solution code:

``````
expected div.ray:nth-child(1) to have its width style equal to 350px but got 349px
``````

Anyone else experience lag when running the code?

yes, and plain css never compiles

On page 8 of the lesson Functions and Operators, I have a curious question. For the width and margin-left properties both use the same condition. Is there a way in SCSS that allows a single condition to be applied to multiple properties without having the need to repeat the condition multiple times?