Differences between true/TRUE and null/NULL

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Hello out there.

I have a small question that I seem unable to find a good answer at.

What is the differences between true/false and TRUE/FALSE (small vs cap. letters). In most cases it seems there are no real differences but I do get warnings in some cases.

Also... what is the difference between null and NULL?

All I can figure out is that this has something with the developmen from C to C++?

Feels like a stupid question... but I don't really have a clue. :cool:

Posted 16-Nov-10 21:52pm

Arv Carsen

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ARopo · Accepted Answer · 2010-11-16T22:02:00

true and false are only valid values for type bool
bool mybool = true;

TRUE is #define TRUE 1 i.e. integer value 1
FALSE is #define FALSE 0 i.e. integer value 0
applied to BOOL

#define BOOL int
BOOL myBOOL = TRUE;
This is also possible
myBOOL = 6;
which is why bool was introduced

nullptr refers to a pointer with no address/value (null I think is c#)

NULL is #define NULL 0 but used as nullptr there for legacy reasons

TRUE, FALSE, NULL are #defines there for legacy reasons

true, false, nullptr are part of the language and recognised by the compiler