The not( Command

Command Summary

Flips the truth value of its argument.

Command Syntax


Menu Location


  1. 2nd TEST to access the test menu.
  2. RIGHT to access the LOGIC submenu.
  3. 4 to select not(, or use arrows and ENTER.

Calculator Compatibility


Token Size

1 byte

The last logical operator available on the 83 series takes only one value as input. not( comes with its own parentheses to make up for this loss. Quite simply, it negates the input: False becomes True (1) and True returns False (0). not( can be nested; one use is to make any True value into a 1.


:not(-20 and 14)



Advanced Uses

not(not(X)) will make any value X into 1 if it's not 0, and will keep it 0 if it is.


not(X) and X=0 have the same truth value, but not( is shorter if the closing parenthesis is omitted:

:If A=0
can be
:If not(A

Related Commands


Unless otherwise stated, the content of this page is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License