How to use boolean datatype in C

Question

I was just writing code in C and it turns out it doesn t have a boolean bool datatype  Is there any C library which I can include to give me the ability to return a boolean bool datatype

User · Accepted Answer

If you have a compiler that supports C99 you can

#include <stdbool.h>

Otherwise, you can define your own if you'd like. Depending on how you want to use it (and whether you want to be able to compile your code as C++), your implementation could be as simple as:

#define bool int
#define true 1
#define false 0

In my opinion, though, you may as well just use int and use zero to mean false and nonzero to mean true. That's how it's usually done in C.

User · Answer

As an alternative to James McNellis answer  I always try to use enumeration for the bool type instead of macros  typedef enum bool  false 0  true 1   bool   It is safer b c it lets the compiler do type checking and eliminates macro expansion races

User · Answer

C99 has a boolean datatype  actually  but if you must use older versions  just define a type   typedef enum  false 0  true 1  bool

User · Answer

C99 introduced  Bool as intrinsic pure boolean type  No  includes needed   int main void       Bool b   1    b   0      On a true C99  or higher  compliant C compiler the above code should compile perfectly fine

User · Answer

struct Bool       int true      int false     int main             bool is a variable of data type     bool       struct Bool bool         below I   m accessing struct members through variable    bool        bool    1 0       print  Student Name is   s   bool true       return 0

User · Answer

We can use enum type for this We don t require a library  For example             enum  false true     the value for false will be 0 and the value for true will be 1

User · Answer

C99 has a bool type   To use it    include  lt stdbool h gt

[c] How to use boolean datatype in C?

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