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Hi,

Have I got the wrong end of the stick, here, or am I correct in saying
that.........

No: '&' is a bitwise AND, whereas '&&' is boolean AND.

As in, if a port was read to see if one of 8 lights had been turned on

InputPort = 0x8E;
if (InputPort & 0x80)       (bitwise)
{
     // we would get here
     printf("MSB set....Someone turned a light on.");
}

whereas

InputPort = 0x8E;
if(InputPort && 0x80)
{
     // We would not get here!
     printf("InputPort is now equal to 128");
}



Dan





 (Embedded     Alok Dubey <adubey@WIPRO.CO.IN>@MITVMA.MIT.EDU>
 image moved   26/01/2001 12:27
 to file:
 pic04797.pcx)





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Subject:  Re: [OT]: quick question on C

Security Level:?         Internal


now .. it is not size "and "pass that would be size&pass
this is size&&pass

Alok

> -----Original Message-----
> From: D Lloyd [SMTP:dan.lloyd@GB.ABB.COM]
> Sent: Friday, January 26, 2001 5:54 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [OT]: quick question on C
>
>
> Hi,
>
> Its the same as
>
> "for( set initial condition ; termination condition ; iteration condition
> )", if you like....where the termination condition is met if 'ptr1' is
> less
> than 'size' AND pass is a non zero value.
>
> Dan
>
>
>
>
>  (Embedded     Oluseyi Odeinde <seyi@OCEAN.CF.AC.UK>@MITVMA.MIT.EDU>
>  image moved   26/01/2001 12:00
>  to file:
>  pic13186.pcx)
>
>
>
>
>
> Please respond to pic microcontroller discussion list
>       <PICLIST@MITVMA.MIT.EDU>
> Sent by:  pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
>
>
> To:   PICLIST@MITVMA.MIT.EDU
> cc:
> Subject:  Re: [OT]: quick question on C
>
> Security Level:?         Internal
>
>
> u lost me there!
>
> Alok Dubey wrote:
>
> > whoops
> >  make that a boolean AND of size and pass
> > sorry
> > alok
> >
> > > -----Original Message-----
> > > From: Alok Dubey (OCS-BLRAKS-AVS)
> > > Sent: Friday, January 26, 2001 5:25 PM
> > > To:   'pic microcontroller discussion list'
> > > Subject:      RE: [OT]: quick question on C
> > >
> > > i hnk it is a boolean of  size and pass which is then compared to
ptr1
> > > alok
> > >
> > >
> > >       -----Original Message-----
> > >       From:   Oluseyi Odeinde [SMTP:seyi@OCEAN.CF.AC.UK]
> > >       Sent:   Friday, January 26, 2001 5:15 PM
> > >       To:     PICLIST@MITVMA.MIT.EDU
> > >       Subject:        [OT]: quick question on C
> > >
> > >       i apologise if this post appears more than once - just realised
> that
> > > the
> > >       1st time i sent it, my [OT] channel was turned off!
> > >
> > >       hello everyone,
> > >
> > >       i came across the following 'for' statement in a code:
> > >
> > >       for (pass=rx_str[ptr1+1]; ptr1<size && pass; ptr1++) {
> > >
> > >       i'm curious about about the 'ptr1<size && pass' of the
statement
> as
> > > i
> > >       have never come across a for loop layed out in this way.
> > >       1. is this valid?
> > >       2. if so, is it the same as saying 'ptr1<size && ptr1<pass' ?
> > >
> > >       TIA
> > >       Seyi
> > >
> > >       --
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> > >
> >
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> --
>
> Seyi Odeinde
> Instrumentation for extreme environments...earth - ocean - space
> Software Development Engineer
> Earth-Ocean Systems
>
> Email: seyi@earth-ocean.com
> Tel: ++44 (0) 2920 875 183 - DL
>      ++44 (0) 7799 537 184 - Mobile
>
> "The most exciting phrase to hear in science, the one that heralds new
> discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
>                 -- Isaac Asimov
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