What is a boolean data type?

[Pep]

This is getting weird. I have to keep moving between visual c and gnu
c++ compilers and now have come across a problem that seems to relate
to the boolean datatype.

I have a method that is defined as

boolean isOkay(string var)
{
... some code ...

return(true);
}

But this seems to not be working properly.

So I did a quick investigation of the boolean adta type and can find
nothing for it. I can find the following

bool = original C
Boolean = C++
BOOLEAN = not sure

So what is boolean and why does it now work the same as bool, or
Boolean or BOOLEAN?

TIA,
Pep.

 

[Jacek Dziedzic]

This is getting weird. I have to keep moving between visual c and gnu
c++ compilers and now have come across a problem that seems to relate
to the boolean datatype.

I have a method that is defined as

boolean isOkay(string var)
{
... some code ...

return(true);
}

But this seems to not be working properly.

So I did a quick investigation of the boolean adta type and can find
nothing for it. I can find the following

bool = original C
Boolean = C++
BOOLEAN = not sure

I would disagree with all three. AFAIK C has no bool type,
the C++ type is 'bool' and Microsoft's type is 'BOOL'.

So what is boolean and why does it now work the same as bool, or
Boolean or BOOLEAN?

Stick to bool, that's the standard C++ type.

HTH,
- J.

 

[linuke]

bool
This keyword is a built-in types in the standard c++, (should be true
or false)

BOOLEAN
Boolean variable (should be TRUE or FALSE).
This type is declared in WinNT.h as follows:
typedef BYTE BOOLEAN;

 

[Pep]

bool
This keyword is a built-in types in the standard c++, (should be true
or false)

BOOLEAN
Boolean variable (should be TRUE or FALSE).
This type is declared in WinNT.h as follows:
typedef BYTE BOOLEAN;

Thanks to everyone, as suspected I'll stick to the c++ type.

Incidentally it turns out the boolean type is working correctly, the
problem with the code is further down the source deck, go figure

Cheers,
Pep.

 

[Ron Natalie]

bool
This keyword is a built-in types in the standard c++, (should be true
or false)

BOOLEAN
Boolean variable (should be TRUE or FALSE).
This type is declared in WinNT.h as follows:
typedef BYTE BOOLEAN;

Which in fact, is not a boolean. It's a char which
has the old C behavior of zero for false, anything else
for true.

 

[Frederick Gotham]

Pep:

boolean isOkay(string var)

If I'm not mistaken, the type in question is called "boolean" in Java, and
"bool" in C++.

There's no such things as "boolean", "BOOLEAN" or "BOOL" in Standard C++.

 

[Clark S. Cox III]

I would disagree with all three. AFAIK C has no bool type,

<OT>
FYI: As of C99, C does have a built in boolean type, it's called
"_Bool", or after you include <stdbool.h>, "bool" (i.e. same name as in
C++).
</OT>

 

[Jacek Dziedzic]

<OT>
FYI: As of C99, C does have a built in boolean type, it's called
"_Bool", or after you include <stdbool.h>, "bool" (i.e. same name as in
C++).
</OT>

Thanks, I forgot C keeps evolving.

- J.