Qalculate! is an arbitrary precision cross-platform software calculator.[9] It supports complex mathematical operations and concepts such as derivation, integration, data plotting, and unit conversion. It is a free and open-source software released under GPL v2.
Qalculate! supports common mathematical functions and operations, multiple bases, autocompletion, complex numbers, infinite numbers, arrays and matrices, variables, mathematical and physical constants, user-defined functions, symbolic derivation and integration, solving of equations involving unknowns, uncertainty propagation using interval arithmetic, plotting using Gnuplot, unit and currency conversion and dimensional analysis, and provides a periodic table of elements, as well as several functions for computer science, such as character encoding and bitwise operations.[10][11][12][13][14][15][16][17][18]
It provides four interfaces: Two GUIs, one using GTK (qalculate-gtk) and another using Qt (qalculate-qt), a library for use in other programs (libqalculate), and a CLI program for use in a terminal (qalc).
qalculate-gtk
qalculate-qt
libqalculate
qalc
Qalculate! is written in C++
Copyright © 2005-2007, 2016 Hanna Knutsson.
GPL License Verified by Christiano Anderson Verified on 7 February 2004 Niklas Knutsson Maintainer
Also, qalculate-gtk (although I understand that you might prefer the CLI) allows you to see the parsed expression as you type and makes it easier to switch between modes. I agree that an alternative mode along the lines of your suggestions might be beneficial. The default mode should however still strive to allow the user to enter expressions as they appear in ordinary texts (it is still far from perfect in this respect), without the need to read a manual.
Qalculate! is a multi-purpose desktop calculator. It is small and simple to use but with much power and versatility underneath. Features include customizable functions, units, arbitrary precision, and plotting.
Qalculate is a multi-functional cross platform desktop calculator. It's easy to use, but it's powerful. It provides a number of powerful multi-functional mathematical libraries, as well as some practical tools to meet daily needs (such as currency conversion and percentage calculation, etc.). The functions of Qalculate include a large number of customizable function libraries, unit calculation and conversion, symbolic calculation (including integral and equation), arbitrary precision, uncertainty propagation, interval arithmetic, drawing and user-friendly interface (GTK + and CLI).
Features include customizable functions, units, arbitrary precision, plotting, and a graphical interface that uses a one-line fault-tolerant expression entry (although it supports optional traditional buttons).
Qalculate is a powerful calculator for Linux that can solve complex mathematical expressions, units conversion, graph plotting and many more sophisticated functions.
Qalculate!'s autocompletion feature quickly prompts you with all possible variables, functions, and units as soon as you start typing. For instance, on typing c, Qalculate! suggest circle, circumference, cal, cal-mean, candela, and more than a dozen more in-built values.
Qalculate! (with the exclamation point) has a long and complex history. The project offers a powerful library that can be used by other programs (the Plasma desktop can use it to perform calculations from krunner) and a graphical interface built on GTK3. It allows you to work with units, handle physical constants, create graphics, use complex numbers, matrices, and vectors, choose arbitrary precision, and more.
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