'?' charater in variable name

[deepakcusat1]

please help me in understanding the below declaration

char f_d_pd??(120??);

what this declaration means.
another thing can we use ? in variable name.
i have compile below code fragment with cc compiler on HP-UX

int main(){
char f_d_pd??(120??);
}

There is no compilation error for this.

Thanks in advance ..

[JosAH]

please help me in understanding the below declaration

char f_d_pd??(120??);

what this declaration means.
another thing can we use ? in variable name.
i have compile below code fragment with cc compiler on HP-UX

int main(){
char f_d_pd??(120??);
}

There is no compilation error for this.

Thanks in advance ..

Those are trigraph sequences ??( and ??( represent [ and ] respectively.
The trigraphs were intrudoced for non-ANSI keyboards that lacked, e.g.
those square brackets. Here are all the available trigraphs:

            ??=     #         ??)     ]         ??!     |
            ??(     [         ??'     ^         ??>     }
            ??/     \         ??<     {         ??-     ~

kind regards,

Jos

[xoinki]

i didnt know this..
thnx for d info

[deepakcusat1]

Thanks a lot

[svlsr2000]

In one of the site i read about difference between c and c++. it has few digraph sequence, i tried google to find more digraph sequnce( if they were any more :) )
but i couldn't find. can any one tell is there any other digraph sequences and if any what are they.
Which are the compilers which support them?

[svlsr2000]

In one of the site i read about difference between c and c++. it has few digraph sequence, i tried google to find more digraph sequnce( if they were any more :) )
but i couldn't find. can any one tell is there any other digraph sequences and if any what are they.
Which are the compilers which support them?

http://david.tribble.com/text/cdiffs.htm#C90-digraph