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Added negative dividend modulo example #709

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Added negative dividend modulo example #709

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10 changes: 10 additions & 0 deletions exercises/concept/wellingtons-weather-station/.docs/introduction.md
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Expand Up @@ -101,6 +101,9 @@ The `%` operator is used for modulus.

5 % 3
# => 2

-7 % 5
# => 3
```

~~~~exercism/caution
Expand All @@ -111,6 +114,13 @@ This is different from normal division.
1 % 0
# Error: Unhandled exception: Division by 0 (DivisionByZeroError)
```

Note that unlike some other programming languages crystal is using floored division to calculate modulus (in JavaScript this would yield -1)
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@meatball133 meatball133 Mar 30, 2025

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Thing here is that, javascripts % isnt modulo, it is remainder, thereby another type of calculation.

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@aduzsardi aduzsardi Mar 31, 2025

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it is using the same operator so nomater what the type of calculation is it's still confusing for some people (as it was for me)


```crystal
-6 % 5
# => 4
```
~~~~

## Rounding
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