hexadecimal addition
in [Perl]
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From: king on 8 Jun 2006 09:11 suppose i have got a variable say $reserved=D0020078 I want to do a hexadecimal addition of $reserved with 08h. so the output should come as $output=D0020080. How can i do this. I didn't find any syntax in "sprintf" for this. Because this is a hexadecimal addition. How can i do this? thanx
From: Nick of course on 8 Jun 2006 09:32 king wrote: > suppose i have got a variable say > $reserved=D0020078 > I want to do a hexadecimal addition of $reserved with 08h. > > so the output should come as $output=D0020080. > How can i do this. > > I didn't find any syntax in "sprintf" for this. > Because this is a hexadecimal addition. > How can i do this? > thanx perl -e '$reserved="D0020078"; printf "%08x\n", oct("0x$reserved") + oct("0x08")' Note - you need to quote the D0020078. If it had not started with an alpha it would have barfed. use strict would also have pointed this out.
From: Ben Morrow on 8 Jun 2006 09:42 Quoth "king" <hara.acharya(a)gmail.com>: > suppose i have got a variable say > $reserved=D0020078 Nope, you haven't. That is, unless you aren't using 'strict', in which case you don't have a number, you have an unquoted string. These are Bad. You probably meant my $reserved = 0xD0020078; > I want to do a hexadecimal addition of $reserved with 08h. There is no such thing as 'hexadecimal addition'. Addition is addition; the question of base only applies to reading and writing numbers. You tell Perl a number written in your source file is hex by preceding it with '0x', as I showed you above. Please read perldoc perldata. You tell Perl to interpret a string as a hex number with the hex function. Please read perldoc -f hex. (While you're there, you'd do well to read all of perldoc perlfunc.) You tell Perl to convert a number to hex representation by using sprintf with the %x or %X formats. You seem to have already read perldoc -f sprintf: you may want to read it again with a proper understanding of the difference between a number and the way it is written. So the answer you are looking for is probably my $reserved = 0xD0020078; print sprintf "%X", $reserved + 0x08; Please read at least some of the Perl documentation, or a good introductory book, before trying random things on your own. Ben -- Every twenty-four hours about 34k children die from the effects of poverty. Meanwhile, the latest estimate is that 2800 people died on 9/11, so it's like that image, that ghastly, grey-billowing, double-barrelled fall, repeated twelve times every day. Full of children. [Iain Banks] benmorrow(a)tiscali.co.uk
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