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mao-sz merged 3 commits into from
Jun 28, 2026
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foundations/09_sumAll : Clarify negative input handling #653

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docs: add note about adding negative inputs in Exercise 09
shauryaa108 Jun 21, 2026
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docs: add note about adding negative inputs in Exercise 09
shauryaa108 Jun 21, 2026
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Merge branch 'main' into fix-negative-input-instruction
mao-sz Jun 28, 2026
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4 changes: 3 additions & 1 deletion foundations/09_sumAll/README.md
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Expand Up @@ -6,7 +6,9 @@ Implement a function that takes 2 positive integers and returns the sum of every
sumAll(1, 4) // returns the sum of 1 + 2 + 3 + 4 which is 10
```

If the function receives invalid arguments (such as negative numbers, non-integers, strings etc. - anything other than positive integers), it should return the string `'ERROR'`.

## Hints

- How will you ensure you're summing all integers within the correct range, no matter the order of the inputs?
- Think about your sum's starting value. Then, how can you make sure every single number from the smaller input to the larger one (including both) gets added to it?
- Think about your sum's starting value. Then, how can you make sure every single number from the smaller input to the larger one (including both) gets added to it?