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WyeSoft Lua Calc (Free) is a free scientific calculator, powered by the Lua scripting language. Knowledge of Lua scripting is not required to use Lua Calc as a scientific calculator, but it will allow you to use the software for more complex tasks, as you can make use of Lua functions in your calculations.
The scientific keypad is made up of 36 keys, and there is also a basic keypad which allows you to use Lua Calc as a simple calculator with larger buttons. Variables can be stored and recalled.
As well as a powerful calculator, Lua Calc can be a great aid to programmers, and can even help with learning Lua or programming in general.
For a small fee, you can upgrade to the full version of WyeSoft Lua Calc. This will add the key editor feature and replace the advertisement buttons with 6 more keypad keys on the scientific keypad, giving you a total of 42 customisable keys (84 including the shifted versions), which can be configured to perform virtually any mathematical function. It will also add the ability to save variables between sessions in the saved table.
You can enter both evaluations and statements into the input field. If the current input can be treated as an evaluation, such as 6+7, the enter button between the input and output fields will turn green and its caption will change to "Calculate". If a valid statement has been entered, which cannot be treated as an evaluation, such as x=30, the enter button will turn blue and read "Execute". If the input field contains neither a valid evaluation nor a valid statement, the button will turn red and its caption will disappear.
The output from the most recent calculation is always stored in the ans variable. This can be used to make a new calculation based on the result of the previous one. For example, you could enter ans+8 and tap the enter button repeatedly to have Lua Calc count upwards in 8's.
When using the onscreen keypad, starting a new command with an operator or a function, rather than a number, will cause Lua Calc to insert ans at the beginning (or in the appropriate place) automatically. For example, if you make a calculation and then start the next command with the + symbol, it will become ans+.
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