dev-cpp-users

[Dev-C++] using FLAGS

[Noorez K. <lor...@ho...>]

I have a question about flags. Here's an example of my problem:

FLAG A = 1;
FLAG B = 2;

Lets say both flags are needed, so they are | together like so... A|B. How 
can I then find what flags are set later on from the single value?

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Re: [Dev-C++] using FLAGS

[Per W. <pw...@ia...>]

enum {
    FLAG_A =3D 0x0001,
    FLAG_B =3D 0x0002,
    FLAG_C =3D 0x0004
};

unsigned flags =3D FLAG_A|FLAG_B;

=2E..

// A is set
if (flags & FLAG_A) {}

// A isn't set
if (!(flags & FLAG_A) {}

// Only A is set
if (flags =3D=3D FLAG_A) {}

// Both A and B is set
if ((flags & FLAG_A|FLAG_B) =3D=3D (FLAG_A|FLAG_B)) {}

// A is set but not B
if ((flags & FLAG_A|FLAG_B) =3D=3D FLAG_A) {}

/Per W

On Fri, 17 Mar 2006, Noorez Kassam wrote:

> I have a question about flags. Here's an example of my problem:
>
> FLAG A =3D 1;
> FLAG B =3D 2;
>
> Lets say both flags are needed, so they are | together like so... A|B. Ho=
w
> can I then find what flags are set later on from the single value?
>
> _________________________________________________________________
> Take advantage of powerful junk e-mail filters built on patented Microsof=
t=AE
> SmartScreen Technology.
> http://join.msn.com/?pgmarket=3Den-ca&page=3Dbyoa/prem&xAPID=3D1994&DI=3D=
1034&SU=3Dhttp://hotmail.com/enca&HL=3DMarket_MSNIS_Taglines
>   Start enjoying all the benefits of MSN=AE Premium right now and get the
> first two months FREE*.
>
>
>
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Re: [Dev-C++] using FLAGS

[Daniel P. <dan...@st...>]

A tip.

double the value for each flag, 1 2 4 8 etc
ex:
   1 + 4 =3D 00000101

   to check weither the flag has been set just use "and"   ex: check for=20
4:   isFlagSet =3D 4 & flags;

it will become 1 if the flag is set and 0 otherwise
/Daniel Pettersson


Noorez Kassam wrote:

> I have a question about flags. Here's an example of my problem:
>
> FLAG A =3D 1;
> FLAG B =3D 2;
>
> Lets say both flags are needed, so they are | together like so... A|B.=20
> How can I then find what flags are set later on from the single value?
>
> _________________________________________________________________
> Take advantage of powerful junk e-mail filters built on patented=20
> Microsoft=AE SmartScreen Technology.=20
> http://join.msn.com/?pgmarket=3Den-ca&page=3Dbyoa/prem&xAPID=3D1994&DI=3D=
1034&SU=3Dhttp://hotmail.com/enca&HL=3DMarket_MSNIS_Taglines=20
>  Start enjoying all the benefits of MSN=AE Premium right now and get th=
e=20
> first two months FREE*.
>
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by xPML, a groundbreaking scripting=20
> language
> that extends applications into web and mobile media. Attend the live=20
> webcast
> and join the prime developer group breaking into this new coding=20
> territory!
> http://sel.as-us.falkag.net/sel?cmd=3Dlnk&kid=3D110944&bid=3D241720&dat=
=3D121642
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users

Re: [Dev-C++] using FLAGS

[Per W. <pw...@ia...>]

Note - bit-wise and is _not_ the same as logical and.

On Sat, 18 Mar 2006, Daniel Pettersson wrote:

> A tip.
>
> double the value for each flag, 1 2 4 8 etc
> ex:
>    1 + 4 = 00000101
>
>    to check weither the flag has been set just use "and"   ex: check for
> 4:   isFlagSet = 4 & flags;
>
> it will become 1 if the flag is set and 0 otherwise

isFlagSet will become 4 if the flag is set, else 0.

To make it a logical expression (needed if isFlagSett is of type bool, or
if the expression is used to count up a variable with 1 if flag is set),
the following is needed:

isFlagSet = (4 & flags) != 0;

/Per W