a desktop calculator running under UNIX shell (but may be adapted
to other systems). The code is just one line!
code: Can't Copy and Paste this? Click here for a copy-and-paste friendly version of this code!
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=**************************************
= Name: calc one-liner
= Description:a desktop calculator running under UNIX shell (but may be adapted
to other systems). The code is just one line!
= By: Amos Shapir
=
= Inputs:type in any perl expression.
=
= Returns:The result is printed, and also retained
in the variable $$ (highjacked for this because
it's the easiest to type)
=
= Assumes:This micro-program uses the power of the perl interpreter
itself as a calculator. It's really more than a trick
than a program, but it's the most useful line of code
I ever wrote!
=
= Side Effects:None that I'm aware of.
=
=This code is copyrighted and has= limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=224&lngWId=6=for details.=**************************************
perl -n -e '$$=eval(); print "$$\n"'
Yes, that's all folks!
Under UNIX csh you can do:
alias calc 'perl -n -e '\''$$=eval(); print "$$\n"'\'
in your .login, then just type "calc" to run it.
Thanks very much for providing that!
I found that with Perl 5.8, the $$ variable could not be hijacked. Hence needed to modify this to $x.
Here is a version with quoting to work on Win32 platforms. (Save as a .bat file).
@echo off
echo === Perl Calculator! ===
echo To quit type exit
perl -n -e (If this comment was disrespectful, please report it.)
12/22/2002 7:23:46 PM:
Thanks for providing this.
I found with Perl 5.8.0 that $$ could not be hijacked so had to change to $x.
Here is a version that works with Win32. Save as a .bat file.
@echo off
echo === Perl Calculator! ===
echo To quit type exit
perl -n -e "$x=eval(); print qq(>$x\n)"
Thanks again.
(If this comment was disrespectful, please report it.)
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12/22/2002 7:21:30 PM: 
