Command line Calculator
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Command Line calculator "CLC" is the calculator that can be used to calculate faster without opening any window.
Just copy the the CLC.exe
to a directory that is in the path on you computer i.e the windows directory. Then just write clc 67+89 and the answer will be
presented to you directly.

CLC supports + - * / %
CLC calculates from left to right with no exceptions. CLC also have some extra parameters that is sent to CLC using \ backslash parameters.

CLC \m 1+1 or just CLC 1+1 will display the result in a messagebox

CLC \c 1+1 will place the result 2 in the clipboard so you can paste the result directly to you application.

CLC \mc 1+1 will place the result in the clipboard and present the result in a messagebox

You can also write

CLC \r2 10/3 this will round the result to 2 decimals you can use 1 to 9 if you want to round the sum of.

the \r parameter can also be combined with the other parameters but it must be added first like this

CLC \r2\c 10/3 or CLC \r2\mc 10/3

in the download I've also included CLCC and that is the same program but the commandline version, it will print the result in the commandline window.
Download Commandline Calculator