Bool expression

**Jim Langston** · Oct 27 '06, 12:35 AM

Re: Bool expression

"2005" <uws2003@yahoo. comwrote in message
news:1161909922 .727130.54480@h 48g2000cwc.goog legroups.com...

Hi,
>
The expression below
bool Full() {return ((mSize==MAXSIZ E) ? true : false);}
>
My question is if (mSize==MAXSIZE ), would it return 1 or 0?
>
Of course I ran the code but it conflicts with the spec that I wanted
to get a second opinion.
>
Thanks

I don't understand your question. If mSize is equal to MAXSIZE the function
will return true, otherwise it woudl return false, but I don't know why it
just wasn't coded

return mSize == MAXSIZE;
which would do the exact same thing.

**Mark P** · Oct 27 '06, 12:35 AM

Re: Bool expression

2005 wrote:

Hi,
>
The expression below
bool Full() {return ((mSize==MAXSIZ E) ? true : false);}
>
My question is if (mSize==MAXSIZE ), would it return 1 or 0?

Neither, it returns "true". Of course, it would be simpler to write:

return mSize == MAXSIZE;

If for some reason the result were converted to an integral type, than
it would be 1, not 0.

**2005** · Oct 27 '06, 01:25 AM

Re: Bool expression

Jim Langston wrote:

"2005" <uws2003@yahoo. comwrote in message
news:1161909922 .727130.54480@h 48g2000cwc.goog legroups.com...

Hi,

The expression below
bool Full() {return ((mSize==MAXSIZ E) ? true : false);}

My question is if (mSize==MAXSIZE ), would it return 1 or 0?

Of course I ran the code but it conflicts with the spec that I wanted
to get a second opinion.

Thanks

>
I don't understand your question. If mSize is equal to MAXSIZE the function
will return true, otherwise it woudl return false, but I don't know why it
just wasn't coded
>

Well, the function above and a spec was given.
My question is when it returns true, would it be 1 or 0? eg if (Full(
<true)) == 1 or 0 ?

return mSize == MAXSIZE;
which would do the exact same thing.

**Jim Langston** · Oct 27 '06, 01:45 AM

Re: Bool expression

"2005" <uws2003@yahoo. comwrote in message
news:1161913460 .960087.219290@ e3g2000cwe.goog legroups.com...

>
Jim Langston wrote:

>"2005" <uws2003@yahoo. comwrote in message
>news:116190992 2.727130.54480@ h48g2000cwc.goo glegroups.com.. .

Hi,
>
The expression below
bool Full() {return ((mSize==MAXSIZ E) ? true : false);}
>
My question is if (mSize==MAXSIZE ), would it return 1 or 0?
>
Of course I ran the code but it conflicts with the spec that I wanted
to get a second opinion.
>
Thanks

>>
>I don't understand your question. If mSize is equal to MAXSIZE the
>function
>will return true, otherwise it woudl return false, but I don't know why
>it
>just wasn't coded
>>

>
Well, the function above and a spec was given.
My question is when it returns true, would it be 1 or 0? eg if (Full(
<true)) == 1 or 0 ?
>

>return mSize == MAXSIZE;
>which would do the exact same thing.

It doesn't return either, it returns true, a boolean value. If you cast a
boolean value to an int, true will become 1 and false will become 0, but
there is no guarantee that the boolean value itself is stored that way. The
compiler is free to store it anyway it wants I understand (one bit, a byte,
a word, whatever).

**David Harmon** · Oct 27 '06, 01:45 AM

Re: Bool expression

On 26 Oct 2006 17:45:22 -0700 in comp.lang.c++, "2005"
<uws2003@yahoo. comwrote,

>The expression below
> bool Full() {return ((mSize==MAXSIZ E) ? true : false);}
>
>My question is if (mSize==MAXSIZE ), would it return 1 or 0?

No, it would return true or false.
By the way, for directness and clarity that should be written as:

bool Full() {return mSize==MAXSIZE; }

**2005** · Oct 27 '06, 02:15 AM

Re: Bool expression

David Harmon wrote:

On 26 Oct 2006 17:45:22 -0700 in comp.lang.c++, "2005"
<uws2003@yahoo. comwrote,

The expression below
bool Full() {return ((mSize==MAXSIZ E) ? true : false);}

My question is if (mSize==MAXSIZE ), would it return 1 or 0?

>
No, it would return true or false.
By the way, for directness and clarity that should be written as:
>
bool Full() {return mSize==MAXSIZE; }

My requirement was to return a 0 when mSize==MAXSIZE.

I coded and did
int tmp = Ful(); and found tmp was 1 when mSize==MAXSIZE

Is it contradictory to what you are saying?

**David Harmon** · Oct 27 '06, 02:35 AM

Re: Bool expression

On 26 Oct 2006 19:33:36 -0700 in comp.lang.c++, "2005"
<uws2003@yahoo. comwrote,

> bool Full() {return mSize==MAXSIZE; }

>
>My requirement was to return a 0 when mSize==MAXSIZE.

Well, that is actually the opposite of your original example.
In that case, make it

int Full() {return mSize!=MAXSIZE; }

^^^ Note change of return type. If you want to return 0 or 1,
don't call it bool.

Either way, adding ?: is just obfuscation.

**David Harmon** · Oct 27 '06, 04:55 AM

Re: Bool expression

On Fri, 27 Oct 2006 02:53:15 GMT in comp.lang.c++, David Harmon
<source@netcom. comwrote,

>On 26 Oct 2006 19:33:36 -0700 in comp.lang.c++, "2005"
><uws2003@yahoo .comwrote,

>> bool Full() {return mSize==MAXSIZE; }

>>
>>My requirement was to return a 0 when mSize==MAXSIZE.

Oh, and if you are going to return 0 when the crock is full and 1
when it is not. then it should be

int not_full() {return mSize!=MAXSIZE; }

**Tim Slattery** · Oct 27 '06, 12:55 PM

Re: Bool expression

"2005" <uws2003@yahoo. comwrote:

>Hi,
>
>The expression below
> bool Full() {return ((mSize==MAXSIZ E) ? true : false);}
>
>My question is if (mSize==MAXSIZE ), would it return 1 or 0?

Neither one. It would return true, which is a boolean value, not an
integer.

--
Tim Slattery
Slattery_T@bls. gov

**Clark S. Cox III** · Oct 27 '06, 08:25 PM

Re: Bool expression

Jim Langston wrote:

"2005" <uws2003@yahoo. comwrote in message
news:1161913460 .960087.219290@ e3g2000cwe.goog legroups.com...

>Jim Langston wrote:

>>"2005" <uws2003@yahoo. comwrote in message
>>news:11619099 22.727130.54480 @h48g2000cwc.go oglegroups.com. ..
>>>Hi,
>>>>
>>>The expression below
>>>bool Full() {return ((mSize==MAXSIZ E) ? true : false);}
>>>>
>>>My question is if (mSize==MAXSIZE ), would it return 1 or 0?
>>>>
>>>Of course I ran the code but it conflicts with the spec that I wanted
>>>to get a second opinion.
>>>>
>>>Thanks
>>I don't understand your question. If mSize is equal to MAXSIZE the
>>function
>>will return true, otherwise it woudl return false, but I don't know why
>>it
>>just wasn't coded
>>>

>Well, the function above and a spec was given.
>My question is when it returns true, would it be 1 or 0? eg if (Full(
><true)) == 1 or 0 ?
>>

>>return mSize == MAXSIZE;
>>which would do the exact same thing.

>
It doesn't return either, it returns true, a boolean value. If you cast a
boolean value to an int, true will become 1 and false will become 0, but
there is no guarantee that the boolean value itself is stored that way.

s/cast/convert/
The difference is significant; (There are no casts in the following
snippet):

int i = true;
int j = false;
bool k = 0;
bool l = 42;

The compiler is free to store it anyway it wants I understand (one bit, a byte,
a word, whatever).

--
Clark S. Cox III
clarkcox3@gmail .com

Bool expression

Bool expression

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