Qalculate!

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.{{Cite web |title=GUI Calculator for Linux |url=https://askubuntu.com/questions/1078571/powerful-gui-calculator-for-linux |access-date=28 April 2021 |website=Ask Ubuntu}}{{Cite web |last=hanna-kn |title=General problem with 'intelligent guessing' attempts · Issue #115 |url=https://github.com/Qalculate/libqalculate/issues/115 |access-date=28 April 2021 |website=Qalculate/libqalculate |publisher=GitHub |language=en |quote=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.}}{{Cite web |title=Software used by the Math Center |url=https://riverbendmath.org/software/ |access-date=28 April 2021 |website=Riverbend Community Math Center |location=South Bend, IN |quote=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.}}{{Cite web |last=Liang Xu |date=2020-10-20 |title=Five commands to use calculator in Linux command line |url=https://www.fatalerrors.org/a/five-commands-to-use-calculator-in-linux-command-line.html |access-date=28 April 2021 |website=fatalerrors.org |quote=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).}}{{Cite web |last=Shirish |date=July 18, 2020 |title=Qalculate! - The Best Calculator Application in The Entire Universe |url=https://itsfoss.com/qalculate/ |access-date=28 April 2021 |website=It's FOSS |publisher=chmod777 Media Tech (OPC) Pvt Ltd |quote=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).}}{{Cite web |last=Oh |first=Damien |date=15 October 2010 |title=Qalculate is a Powerful Calculator For Linux |url=https://www.maketecheasier.com/qalculate-powerful-calculator-for-linux/ |access-date=28 April 2021 |website=Make Tech Easier |quote=Qalculate is a powerful calculator for Linux that can solve complex mathematical expressions, units conversion, graph plotting and many more sophisticated functions.}}{{Cite web |last=Sharma |first=Shashank |date=8 October 2008 |title=In search of bigger, stronger calculators |url=https://www.linux.com/news/search-bigger-stronger-calculators/ |access-date=28 April 2021 |website=Linux.com |quote=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.}}{{Cite web |last=Devcic |first=Ivana Isadora |date=12 November 2015 |title=Make Math Easy with These Linux Apps |url=https://www.makeuseof.com/tag/make-math-easy-linux-apps/ |access-date=28 April 2021 |website=MUO - makeuseof.com}}{{Cite web |title=Qalculate! Manual v3.21.0 |url=https://qalculate.github.io/manual/index.html |access-date=2021-10-30 |website=qalculate.github.io}}

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+ GUI): qalculate-gtk{{Cite web |last=Berlasso |first=Ricardo |title=2 scientific calculators for the Linux desktop |url=https://opensource.com/article/18/1/scientific-calculators-linux |access-date=28 April 2021 |website=Opensource.com |language=en |quote=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.}}
• Qalculate! (Qt GUI): qalculate-qt
• Qalculate! (CLI): qalc (usually provided by the libqalculate package){{Cite web |title=QALC man page |url=https://qalculate.github.io/manual/qalc.html |website=qalculate.github.io}}
• Qalculate! (Library): libqalculatePlasma desktop can use Library to perform calculations from krunner

File:Libqalculate interactive session.png

• Bartel, Alexandre. [https://www.abartel.net/static/p/hacklu2019_build_engine.pdf "DOS Software Security: Is there Anyone Left to Patch a 25-year old Vulnerability?."]
• "In our example of Figure 7, we choose to execute /usr/bin/qalculate-gtk, a calculator. Since the stack of the DOSBox process is non-executable, we cannot directly inject our shellcode on it."
• "The Gnome calculator was used to perform these calculations and the results were verified using the Qalculate! calculator and WolframAlpha (15) since spreadsheets are unable to perform these calculations."

• Mathematical software
• List of arbitrary-precision arithmetic software
• Comparison of software calculators

{{Reflist}}

• [https://qalculate.github.io/ Qalculate! - the ultimate desktop calculator] at GitHub
• [https://qalculate.github.io/downloads.html Qalculate! - downloads] at GitHub
• [https://github.com/Qalculate/qalculate-gtk Qalculate/qalculate-gtk] GUI at GitHub
• [https://qalculate.github.io/manual/index.html Qalculate! Manual] at GitHub
• [https://qalculate.github.io/manual/qalc.html QALC] man page at GitHub
• Ubuntu – [https://packages.ubuntu.com/bionic/gnome/qalculate Details of package qalculate] in bionic
• Ubuntu – [https://packages.ubuntu.com/focal/qalculate Details of package qalculate] in focal
• [https://pvs-studio.com/en/blog/posts/cpp/0616/ Qalculate! code review] by PVS-Studio

Category:Free educational software

Category:GNOME Applications

Category:Software calculators

Category:Free software programmed in C++

Category:Software using the GNU General Public License

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