Chapter 2.4.3 Kcalc
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Kcalc is a scientific calculator application.

Features:

 - trignometric functions
 - factorials
 - built in mathematical and scientific constants.
 - memory
 - copy and paste

Useage
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To do simple arithmetic click the numbers and then press the sign for addition, multiplication, subtraction,  or division. You can also type in the numbers and press + for addition, - for subtraction, * for multiplication and / for division. To view the answer press the button that is an =. 
 
.. image:: Kcalc.png

To make a number negative press the button that looks like a +/-. To insert decimals press the decimal point button which looks like . when you get to the part which is less than a whole number. To clear input from Kcalc Press the button with a C on it. To group operations so they happen together use the parenthesis to make things grouped to gether for example 2*(2+3) would give the result of 10 because it would add 2 and 3 and then multiply by two.

To copy and answer out of Kcalc press control + c or edit -> copy from the menu. To paste a number into Kcalc you can press control + v or edit -> paste from the menu. To cut the text from Kcalc press control +x or edit -> cut from the menu.

If you want even more functionality of Kcalc there is also scientific mode which is acessed from settings and the scientific mode radio button. The button 1/x takes takes 1 and divides it by the number currently on the calculator also known as taking the reciprocal. x! read x factorial will take the number X you entered and multiple each number going down to 1 for example 5! would multiply 5*4*3*2*1. 

The x squared button will take a x*x and multiply it by itself. The button with x and a superscript y will take x the number you have in will exponeniate x to the power of y. The x 10 with a supercript y will end up multiplying x by 10 to the power of y so for example to multiply 5 by 10 to the power of 3 entering in will give the answer of 5,000.      


.. image:: kcalc-scientific.png

Version
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Lubuntu ships with version 18.04.3 of Kcalc.

How to launch
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To launch kcalc go to accessories -> Kcalc or run

.. code::

   kcalc 
 
from the command line.