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using jb of a unsigned char in c

heyvaert vincent

hello,
I would like to do a bit test of a unsigned char variable. It's like a jb in assembler.

here is my code in c.


unsigned char displ;
unsigned char display3 = 0xA8;
unsigned char i;
sbit display_data = P1^0;

displ = display3;
for (i=0; i<7; i++) {
        if (displ^0 == 1){
        display_data = 0;
        }
        else {
        display_data = 1;
        }
        displ>>=1;
}


I don't have any warning or error, but the result of test is wrong.
is it possible to do in c?

tkx.

Parents
  • 0 in reply to erik malund

    I used to detest that K&R style also, but after contracting for so many companies, each invariably with different coding style rules, I've learned to be at peace with whatever as long as it's consistent. For forum posts however, I have adopted the K&R style for the simple reason of conserving vertical space in threads.

    Right now, I'm contracting to the same outfit where the K and the R of K&R work, so guess which brace style I'm using at present. ;-)

Reply
  • 0 in reply to erik malund

    I used to detest that K&R style also, but after contracting for so many companies, each invariably with different coding style rules, I've learned to be at peace with whatever as long as it's consistent. For forum posts however, I have adopted the K&R style for the simple reason of conserving vertical space in threads.

    Right now, I'm contracting to the same outfit where the K and the R of K&R work, so guess which brace style I'm using at present. ;-)

Children
  • 0 in reply to Dan Henry

    This is not quite as K&R would have it:

    for (i=0; i<7; i++) {
        if (displ^0 == 1){
        display_data = 0;
        }
        else {
        display_data = 1;
        }
        displ>>=1;
}


    "True" K&R style would be:

    for (i=0; i<7; i++) {
        if (displ^0 == 1){
                display_data = 0;
        }
        else {
                display_data = 1;
        }
        displ>>=1;
}


    The "controlled" lines are indented relative to the "controlling" lines.

  • 0 in reply to Andy Neil

    well, fortunately, while we have to adhere to the syntax, we are free to improve on the style.

    I have a lingering suspicion that K&R are, at least partially, responsible for much of the "elegant" C that abounds

    Erik

    PS if anyone does not get that I am fastidious when stating "elegant" the are now told.