Math after hex conversion

amudelkaa has asked for the wisdom of the Perl Monks concerning the following question:

Hi I have been trying to performing some math op after converting the number to hex(since I need to print it in hex) before doing some math on it, but to no avail. Here's the snippet.

    $b_ecc = $b_ecc->as_hex();
    $bmask = $bmask->as_hex();
    $bigint_data = $bigint_data->as_hex();
    print "$bigint_data, $bmask, $b_ecc\n";
    $count_xor+=1 if($b_ecc->is_odd());
[download]

And I get this error instead:

Can't call method "is_odd" without a package or object reference at blah in line 21

Something I am missing here. Works fine, if I don't covert it to int. I have alternative methods to get around this, but would like to understand the problem though.

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Re: Math after hex conversion by Corion (Patriarch) on Nov 09, 2016 at 11:36 UTC
Why do you convert your number to a string in hexadecimal representation when you still want to do arithmetic with it? I think that removing the line will do what you want: `# $b_ecc = $b_ecc->as_hex(); # remove this` [download]	[reply] [d/l]
Re: Math after hex conversion by ww (Archbishop) on Nov 09, 2016 at 11:47 UTC
Convert the result of your math ops; not the input. If you didn't program your executable by toggling in binary, it wasn't really programming!	[reply]
Re: Math after hex conversion by Monk::Thomas (Friar) on Nov 09, 2016 at 14:42 UTC
After this statement `$b_ecc = $b_ecc->as_hex();` [download] $b_ecc is no longer an object, you replaced it with a simple scalar value ("0xdeadbeef" or whatever ->as_hex() returns). But then you try to execute '$b_ecc->is_odd()' on something that's no longer an object and Perl complains about it. Solution: Don't clobber your variables, pick some other names: `my $val1 = $b_ecc->as_hex(); my $val2 = $bmask->as_hex(); my $val3 = $bigint_data->as_hex(); print "$val3, $val2, $val1\n"; $count_xor+=1 if($b_ecc->is_odd());` [download]	[reply] [d/l] [select]
Re: Math after hex conversion by GotToBTru (Prior) on Nov 09, 2016 at 13:10 UTC
The only math I see is `$count_xor += 1`. But the error message has nothing to do with math. You don't show which modules you're using, but you've forgotten the one that defines `is_odd()`. But God demonstrates His own love toward us, in that while we were yet sinners, Christ died for us. Romans 5:8 (NASB)	[reply] [d/l] [select]