How to return a boolean in C?

Question

I'm trying to create a function which should return true or false if a given number complies with the given conditions. Anyway, it doesn't seem to work. Here's the code:

bool conditions(int i) {                                            
    return (i != '\n' & i != ' ' & i != '\t' & i != EOF) ? true : false;
}

Any help will be really appreciated!

Have you included `stdbool.h`? Be more specific on how it doesn't work. — anastaciu, May 21 '21 at 13:54
If you want to use `bool`, yes you need `stdbool.h`. It contains the necessary macros that define `bool`. — Robert Harvey, May 21 '21 at 13:55
Oh ok, thanks a lot! Anyway, when I use, for instance, conditions(1), the compiler gives me the error " conflicting types for 'conditions' " — LollolCat, May 21 '21 at 14:00
@LollolCat the conflicting types problem is probably because you don't declare or define the function before use. — anastaciu, May 21 '21 at 14:01
Not entirely since the funtion doesn't work even if I've included stdbool.h — LollolCat, May 21 '21 at 14:03
`stdbool.h` makes `bool` into an alias (a macro) for the reserved keyword `_Bool`. — Ted Lyngmo, May 21 '21 at 14:03

score 0 · Answer 1 · answered May 21 '21 at 13:58

0

You have to use stdbool.h library (#include <stdbool.h>) or define type yourself. answer to question

answered May 21 '21 at 13:58

Kawson

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A "Vote to close as duplicate" is more appropriate. – Robert Harvey May 21 '21 at 14:02
I can't find button to close as duplicate (even tried search for it in stack forum). @SergeyA I though that helps if I linked post where everyone can find answer. That's why you downvote me? Hm... – Kawson May 21 '21 at 14:30
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@Kawson The _close_ button is a gray little text (not even looking like a button) under the question. If you don't have rep to vote to close you can make a comment: "Does _link to the duplicate_ answer your question?" – Ted Lyngmo May 21 '21 at 14:42
1

@TedLyngmo okey, I don't have this option yet, will remember next time – Kawson May 21 '21 at 14:44

How to return a boolean in C?

1 Answers1