CLiC - A very simple command line calculator

kmason · 2010-07-21 23:07:18

Okay, I know, there's probably a ton of command line calculators out there, but I figured I'd post the one I just made anyways, even if it is done very amateurishly IMO.

Its 51 SLOC, so its probably pretty light, even though it is just a calculator. It actually uses AWK for the calculations, which I thought was pretty interesting.

Last edited by kmason (2010-07-21 23:15:41)

steve___ · 2010-07-22 03:59:32

I use this in my .bashrc

calc () { awk "BEGIN { print $* }" }

kmason · 2010-07-22 04:38:33

steve___ wrote:

I use this in my .bashrc
calc () { awk "BEGIN { print $* }" }

Oh geesh... That's amazing how something I made so complex can be so simple...

Thanks.

Husio · 2010-07-22 06:32:51

# calc() { echo $(( $@ )) }
# calc 2 + 3
5
# calc 6 / 3
2
# calc '6 * 3'
18

steve___ · 2010-07-22 12:24:10

@Husio

# booga() { echo $(( $@ )) ; }
$ booga 1+2
3
# booga 1.2+2.3
bash: 1.2+2.3 : syntax error: invalid arithmetic operator (error token is ".2+2.3 ")

Bash does not support floating point.

Stalafin · 2010-07-22 13:34:06

calc() { echo "$@" | bc -l ; }

Awesome, too...

dmz · 2010-07-22 13:57:01

#!/usr/bin/perl
use strict;
# calc

print "Expression?\n";
while (1) {
  print '> ';
  chomp(my $c = <STDIN>);
  exit(0) if(($c =~ /^\s*:q\s*/));
  my $i = eval($c);
  printf("%d 0x%x 0%o %b %f %s \n", $i, $i, $i, $i, $i, $i);
}

brisbin33 · 2010-07-22 14:05:41

Stalafin wrote:

calc() { echo "$@" | bc -l ; }
Awesome, too...

throw a "scale=3; " in front of the $@ to do decimals too.

bc is a full fledge math language so you can get pretty crazy with your little calc if you know what you're doing.

//blue/0/~/ pi=$(calc '4*a(1)')
//blue/0/~/ echo $pi
3.140

Pank · 2010-07-31 15:27:36

I like this R-based calculator, even though it might be slightly slower than bc.

# Calc based on R
# http://www.compbiome.com/2010/06/r-command-line-calculator-using-rscript.html
alias Calc='Rscript -e "cat( file=stdout(), eval( parse( text=paste( commandArgs(TRUE), collapse=\"\"))),\"\n\")"'

quigybo · 2010-08-02 07:30:46

I also use awk's print $* for simple stuff, for anything more complicated I just run a python shell with from math import *. Variable assignment, functions, loops, what more could you need . And I already have readline completion in my $PYTHONSTARTUP so I'm a happy camper.

Ari'osika · 2010-08-02 07:40:21

perl -e 'print 30+12,"\n"';
42

perl -e 'print 50-8,"\n"';
42

perl -e 'print 21*2,"\n"';
42

perl -e 'print 84/2,"\n"';
42

Last edited by Ari'osika (2010-08-02 07:56:11)

cesura · 2010-08-02 07:54:03

"The official calculator thread" ?

Stalafin · 2010-08-02 08:31:24

brisbin33 wrote:

Stalafin wrote:
calc() { echo "$@" | bc -l ; }
Awesome, too...
throw a "scale=3; " in front of the $@ to do decimals too.
bc is a full fledge math language so you can get pretty crazy with your little calc if you know what you're doing.
//blue/0/~/ pi=$(calc '4*a(1)')
//blue/0/~/ echo $pi
3.140

Indeed; I just assumed one would call calc with scale=xx...

Just checked it - if one calls bc like so

echo "scale=3;scale=5; 4*a(a)" | bc -l

The last scale= setting will override the previous one.

dmz · 2010-08-02 09:21:29

Ari'osika wrote:

perl -e 'print 30+12,"\n"';
42

perl -e 'print 50-8,"\n"';
42

perl -e 'print 21*2,"\n"';
42

perl -e 'print 84/2,"\n"';
42

perl -E 'say eval while<>'

Ari'osika · 2010-08-02 09:46:26

dmz wrote:

Ari'osika wrote:

perl -e 'print 30+12,"\n"';
42

perl -e 'print 50-8,"\n"';
42

perl -e 'print 21*2,"\n"';
42

perl -e 'print 84/2,"\n"';
42

perl -E 'say eval while<>'

Touche, I forgot about the -E switch.

falconindy · 2010-08-02 11:12:42

No reverse polish? I'll chip in.

kmason · 2010-08-03 03:08:48

Thanks to all of you guys' suggestions, I modified my script, into 10 SLOC (including comments and the header):

#!/bin/bash
# CLIC - Command Line Interactive Calculator
while true; do
read -p "Expression?: "
if [[ "$REPLY" = "" ]]; then
exit
else
scale=3 echo $REPLY | bc -l ;
fi
done

A minor detail you might have figured out: I replaced the lower case "i" in the name with an uppercase, for Interactive.

Last edited by kmason (2010-08-03 03:09:29)

Arch Linux

#1 2010-07-21 23:07:18

CLiC - A very simple command line calculator

#2 2010-07-22 03:59:32

Re: CLiC - A very simple command line calculator

#3 2010-07-22 04:38:33

Re: CLiC - A very simple command line calculator

#4 2010-07-22 06:32:51

Re: CLiC - A very simple command line calculator

#5 2010-07-22 12:24:10

Re: CLiC - A very simple command line calculator

#6 2010-07-22 13:34:06

Re: CLiC - A very simple command line calculator

#7 2010-07-22 13:57:01

Re: CLiC - A very simple command line calculator

#8 2010-07-22 14:05:41

Re: CLiC - A very simple command line calculator

#9 2010-07-31 15:27:36

Re: CLiC - A very simple command line calculator

#10 2010-08-02 07:30:46

Re: CLiC - A very simple command line calculator

#11 2010-08-02 07:40:21

Re: CLiC - A very simple command line calculator

#12 2010-08-02 07:54:03

Re: CLiC - A very simple command line calculator

#13 2010-08-02 08:31:24

Re: CLiC - A very simple command line calculator

#14 2010-08-02 09:21:29

Re: CLiC - A very simple command line calculator

#15 2010-08-02 09:46:26

Re: CLiC - A very simple command line calculator

#16 2010-08-02 11:12:42

Re: CLiC - A very simple command line calculator

#17 2010-08-03 03:08:48

Re: CLiC - A very simple command line calculator

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