Simple boolean question (Beginner)

[Delameko]

I've got a boolean value being returned from a class, and I'm trying to create an if statement, something like:

if (boolean == true)
cout << &quot;True!&quot;;
else
cout << &quot;False!&quot;;

Well its not working as it always finds it true.

This is because the boolean == true is an int comparison, right?

So can someone help me out? All the text's I see only mention booleans in passing...

Thanks in advance.

 

[Bones3]

I think it would be best to put the output statement in the member function itself like so if it is possible:

BOOL SomeFN(param a, param b)
{
if (a == b)
{
cout << &quot;True!&quot;;
return TRUE;
}
if (a != b)
{
cout << &quot;False!&quot;;
return FALSE;
}
}



-Bones

 

[VincentP]

I don't think
boolean == true
is valid on all compilers... a boolean variable is usually just an int, but the &quot;true&quot; reserved keyword is special.

Try the following:

if (boolean)
cout << &quot;True!&quot;;
else
cout << &quot;False!&quot;;

(you can also do
if( !boolean )
if you want to trigger on boolean == false)

Do not forget that
if( boolean )
will fire on ANY non-zero value of boolean! Make sure it is properly initialized!

Vincent

 

[uolj]

The

bool

type is a standard C++ type. Anything else, like BOOL, is not and is usually just a typedef for an int or something. If you want to use the actual

bool

type, it can only have two values -

true

and

false

. You might be able to convert an int (or BOOL) to a

bool

with just a warning, but if you stick to

bool

your comparisons (like below) will work.

bool myBooleanVariable = true;

if (myBooleanVariable == true)
    cout << &quot;True!&quot;;
else
    cout << &quot;False!&quot;;

if (myBooleanVariable)
    cout << &quot;True!&quot;;
else
    cout << &quot;False!&quot;;

if (myBooleanVariable == false)
    cout << &quot;False!&quot;;
else
    cout << &quot;True!&quot;;

if (!myBooleanVariable)
    cout << &quot;False!&quot;;
else
    cout << &quot;True!&quot;;