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alfredxing

Description

A simple command-line calculator written in Go

442 Stars 37 Forks MIT License 48 Commits 6 Opened issues

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calc

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A simple, fast, and intuitive command-line calculator written in Go.

Install

Install calc as you would any other Go program:

go get github.com/alfredxing/calc

Usage

You can use calc in two ways: shell mode and command.

Shell mode

This is probably the mode you'll want to use. It's like the

python
shell or
irb
. The shell mode uses the
terminal
package provided by
golang.org/x/crypto/ssh/terminal
, which means it supports many of the shell features you know and love (like history, pasting, and the
exit
command). ```shell

1+1 2 3(5/(3-4)) -15 3pi^2 29.608813203268074 @+1 30.608813203268074 @@@*2 -30 ln(-1) NaN ```

Command

You can also use calc to evaluate an expression with just a single command (i.e. without opening the shell). To do this, just use

calc [expression]
:
shell
bash$ calc 1+1
2
bash$

Supported functions, operators, and constants

calc supports all the standard stuff, and I'm definitely adding more later (also feel free to fork and add your own!)

Operators

+
,
-
,
*
,
/
,
^
,
%
Functions

sin
,
cos
,
tan
,
cot
,
sec
,
csc
,
asin
,
acos
,
atan
,
acot
,
asec
,
acsc
,
sqrt
,
log
,
lg
,
ln
,
abs
Constants

e
,
pi
,
π
History

Previous results can be accessed with the

@
symbol. A single
@
returns the result of the last computation, while multiple
@
gets the nth last result, where n is the number of
@
s used (for example,
@@
returns the second-last result,
@@@@@
returns the fifth-last result).

Why not use ...?

  • Google
    • Doesn't work without an internet connection
    • Slower
    • Doesn't show previous computations, so you end up with multiple tabs open at once.
  • Spotlight (on OS X)
    • No history
    • Switching between Spotlight and other windows isn't too fun
  • Python/IRB
    • Requires use of a separate math module for most functions and constants
    • A little bit slower to start up
  • bc
    • Limited number of built-in functions; these have shortened (not too intuitive) names as well.

The alternatives above are all great, and have their own advantages over calc. I highly recommend looking into these if you don't like how calc works.

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