bool statements in C?

**g1i7ch** · 07-10-2006

Are boolean statements supported in C?
if not how would you work around this?

**Prelude** · 07-10-2006

>Are boolean statements supported in C?
Absolutely. What are you trying to do?

**g1i7ch** · 07-10-2006

when I declare bool whatever = true; I get compiler error "bool undeclared identifier"

**Prelude** · 07-10-2006

Are you using C99? If so, this should work just peachy:

Code:

#include <stdbool.h>

int main ( void )
{
  bool whatever = true;
}

But in the more likely case that you're using C89, you'll need to use an int.

**sand_man** · 07-10-2006

Prelude once told me to use this as an alternative.

Code:

typedef enum {true, false} bool;

However, using an int is just as easy and just as useful.

**King Mir** · 07-10-2006

Or a char . . .

TRUE and FALSE are fairly common macros.

**g1i7ch** · 07-10-2006

Ok, I got it working. On my box, I had use TRUE && FALSE in caps with out declaring bool ,ie:

Code:

int main ( void )
{
  whatever = TRUE;
}

Thanks all

!

**quzah** · 07-10-2006

Our mistake, we assumed you meant a standard implementation...

Quzah.

**kermit** · 07-10-2006

Originally Posted by sand_man

Prelude once told me to use this as an alternative.

Code:

typedef enum {true, false} bool;

However, using an int is just as easy and just as useful.

It might be a little more intuitive to switch the order of true and false in your enum..

Code:

typedef enum {FALSE, TRUE} boolean;

**Prelude** · 07-11-2006

>Prelude once told me to use this as an alternative.
Actually, it was probably more like this due to the common use of true, false, and bool:

Code:

typedef enum { BFALSE, BTRUE } bool_t;

One thing I certainly like about C++ is the introduction of namespaces to help with naming collisions.

Thread: bool statements in C?