u are right..
& is bit wise and.. thats wht i said..
&& is boolean.. eg a&&b will be zero if either a or b is zero.

but go back to ur code..
the line
 inputport&&0x80
would return 1 too! coz the neither inputport nor 0x80 is 0
so u get the
 printf ("MSB is 128")
 running in that too..


try it .. i did :-)
u either check a&b for 128 that is the safest way to check


what amazes me is why someone is using && .. that to in the code mentioned
by Olyeusi.

well.. thanks for the same.. a good break from some boring socket code here

Alok

> -----Original Message-----
> From: D Lloyd [SMTP:dan.lloyd@GB.ABB.COM]
> Sent: Friday, January 26, 2001 6:16 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [OT]: quick question on C
>
>
> 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)
>
>
>
>
>
> 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
>
>
> 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
> > > >
> > > >       --
> > > >       http://www.piclist.com hint: To leave the PICList
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> > > >
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> > > http://www.piclist.com hint: To leave the PICList
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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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> >
> >
> >
> >  << File: pic13186.pcx >>
>
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>
>
>
>  << File: pic04797.pcx >>

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