Sums – keyboard-driven postfix calculator

Sums is a postfix calculator designed for quick mathematical calculations using a keyboard-oriented interface. It follows GNOME’s human-interface guidelines and concentrates on simplicity rather than providing a large collection of calculator buttons.

Postfix notation places operations after their operands. For example, instead of entering an expression in conventional algebraic form, users enter the relevant values followed by the operation to apply to them.

Sums recognises English-language names for mathematical operations and constants. This allows expressions to be entered using familiar words rather than requiring users to remember a large set of mathematical symbols.

The application also converts recognised terms into mathematical notation as expressions are typed. For example, the word pi can be displayed using the Greek letter π, while a summation operation can be represented by Σ.

A calculation history allows users to navigate between previous operations, making it easy to review an earlier result. Results can also be copied to the clipboard for use in other applications.

This is free and open source software.

Key Features

• Postfix expression evaluation.
• Keyboard-oriented interface.
• Recognises English-language names for mathematical operations.
• Supports mathematical constants.
• Automatically converts recognised expressions into mathematical symbols.
• Two-way navigation through calculation history.
• Copy calculation results to the clipboard.
• Interface designed around GNOME human-interface guidelines.

Website: gitlab.com/leesonwai/sums
Support:
Developer: Joshua Lee
License: GNU General Public License v3.0

Sums is written in C. Learn C with our recommended free books and free tutorials.

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