OP solved it, closing

you shouldnt codde like this, lisibility comes first.

In ISO/IEC 9899:1999 (C99) the equality operators are defined as follows
"Each of the operators yields 1 if the specified relation is true and 0 if it is false. The result has type int."

Can someone explain to me the expression inside the while loop. I know what it does, I just dont know how if according to me it requires an if statement.

Which?

This is not the proper way to raise an issue:

• Your code is not formated and is unreadable
• Please don't post code without using a spoiler flag
• You must prove there is an issue not just say "My code should work but it doesn't"

Please read carefully this and don't raise issues so lightly in the future: https://docs.codewars.com/training/troubleshooting/

There are big problems with this Kata created by the author

Not a kata issue.

This is a well thought short precise and beautiful answer.

Read this: https://docs.codewars.com/training/troubleshooting/#post-discourse and this: https://docs.codewars.com/training/troubleshooting/#c-c-signal-6---sigabrt

Youre right. I forgot the division does a floor()

That's not how integer division work. You'll get 6(D) in both cases, the only difference is the remainder.