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Questions tagged [stdbool]

15 questions
14
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3 answers

Why use instead of _Bool?

Any time I had the need of a Boolean type I was told to either create one, or better yet, use stdbool.h. Since stdbool.h uses typedef bool _Bool, is there a reason to use the header instead just using type _Bool? Is it just for the additional macros…
CIsForCookies
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Is (bool) cast reliably 0 or 1?

From some reading on Stack Overflow, I gather that bool, as defined in stdbool.h, is a macro that expands to the built-in type _Bool, and that true is defined as 1 and false is defined as 0. Is casting to bool guaranteed to return a value of 0 or 1?…
StoneThrow
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Why is stdbool.h deprecated?

The C standard now says: The ability to undefine and redefine the macros bool, true, and false is an obsolescent feature and may be removed in a future version. That is, stdbool.h is deprecated. But no rationale is given and I couldn't find one. …
Lærne
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4 answers

Writing a function in C that returns a boolean

As C does not have boolean types, how can I write a function like this in C: bool checkNumber() { return false; }
olidev
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1 answer

Is failure to implicitly convert a pointer to _Bool a compiler deficiency?

Answers to this question state that scalars can be converted to _Bool and that the resulting integer value of the _Bool will be 0 or 1. The accepted answer to this question points out that pointers are scalars. Is a failure to implicitly convert a…
StoneThrow
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0 answers

visual studio 2012 compiler does not recognize stdbool.h

I'm writing a header file for binary search tree, however when i compiled visual studio 2012 compiler does not recognized stdbool.h header.I got this error: error C1083: Cannot open include file: 'stdbool.h': No such file or directory why am i…
bluebk
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Scan boolean value using library

is it possible to get a scanf of a value generated with the standard library ''? For example if you wanted to scan the value of 'bool check;' where check is the name how can I do this without assigning it to another element? Here is a…
Leonardo
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Why is C99's bool a macro rather than a typedef?

Why does the boolean type support introduced in C99 use the preprocessor rather than the language's own facilities? Specifically, why do we have: #define bool _Bool #define true 1 #define false 0 in rather than: typedef _Bool…
einpoklum
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1 answer

MISRA C 2004 and c99

Rule 1.1 of the MISRA C 2004 specifies that the spec covers c90 and not c99. I would like to use the stdint and stdbool libraries instead of coding my own. Has anyone made this exception in their MISRA implementation?
JeffV
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Why is scanf working abnormally for bool input in C?

I am trying to get input for 3 bool variables and 1 int variable. Even though I give input correctly, it is not behaving right. I am using %d as format specifier for bool in stdbool.h as suggested by @taufique in Format specifier in scanf for bool…
Alagusankar
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4 answers

Boolean in C Programming

So , unfortunately I encountered another problem with a program I'm trying to create. First of all I'm totally new to C Programming and I'm trying to create a Word Search . I have this piece of code which is in C++ and I'm trying to turn it into C…
Takari
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1 answer

What's the purpose of _Bool in C99?

As for stdbool.h, I can see some people wanting to have constants for true and false and a type named bool if only for clarity (though I'm not really one of them, personally). However, what's the purpose of the actual _Bool type? Why not just define…
Dolda2000
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Building msgpack-python on Solaris 10 - Use of is valid only in a c99 compilation environment

I'm trying to build the python module msgpack-python on Solaris with the Sun compiler and am getting this error during the python ./setup.py build: /opt/SUNWspro/bin/cc -DNDEBUG -O -xO3 -m32 -xarch=sparc -I/opt/csw/include -xcode=pic32…
user1522264
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Why do I get an error when I use %d in scanf when I use stdbool.h?

There are times when I use stdbool.h while practicing coding. At this time, if the format modifier of scanf is given as %d, the following error message occurs. c:\project\hello\hello\hello.c(11): warning C4477: 'scanf' : format string '%d' requires…
HJS
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What does do?

What does the do when using it in a C code? I searched for it on the Wikipedia and didn't get answers in my language, i would love that someone will explain to me what it means.
Mr. Robot
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