I had been using GUI based calculators SpeedCrunch and Galculator for long. Recently I got addicted to the drop-down terminal AltYo and tend to do everything from the terminal. I found the feature-rich wcalc, which can literally do anything you might expect from a scientific calculator. One of its powerful features is the support for variables which allows you to use it like a programming language. wcalc is a very old utility. The development started in early 2002.

#### Features

- Use natural expressions, no learning curve
- Use decimal, hex, oct, binary, degree or radian
- Unit conversions
- Set to throw warning if result is rounded off
- Variables for storing numerical values, pre-defined functions or literals (with descriptions)
- Last result stored in variable
*a* - Stores history through multiple invocations
- Use functions like floor, sin, sqrt, fact, rand, round, abs, ceil, log and so on…
- Constants for Pi, logarithmic constant, acceleration due to gravity, speed of light etc. It supports Universal, Electromagnetic, Atomic and Nuclear, Physio-Chemical and Random constants.
- Several commands to control the behaviour and interpretation
- Store settings in
*~/.wcalcrc* - Store persistent information between instances in
*~/.wcalc_preload*

#### Installation

To install wcalc on Ubuntu, run:

$ sudo apt-get install wcalc

#### Usage

- Calculate expression as argument
$ wcalc '(13+14)/(3-5)' = -13.5

- Calculate (15+19)/(3+4) interactively
$ wcalc Enter an expression to evaluate, q to quit, or ? for help: -> 15+19 = 34 -> a/(3+4) = 4.85714 -> quit

Note that the special variable

always stores the last result.*a* - Using variables, functions and constants
$ wcalc Enter an expression to evaluate, q to quit, or ? for help: -> foo=5 foo = 5 -> bar=foo+4 bar = 9 -> baz=(sin(bar)+foo)/pi baz = 1.64134 -> quit

- Single-line base conversion from decimal to hex
$ echo 100 | wcalc -h = 0x64

- Interactive base conversion
$ wcalc Enter an expression to evaluate, q to quit, or ? for help: -> 10*34 = 340 -> \h Hexadecimal Formatted Output = 0x154 -> \b Binary Formatted Output = 0b101010100

Webpage: wcalc

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