NOT Operator

We use the NOT operator to reverse or negate a condition. If the condition is true, NOT will return false and viceversa. In some programming languages NOT operator is denoted by “!” symbol.

Real-Life Example

For example, you can go to play only if it is not raining, otherwise, you must stay indoors. Unlike the previous examples, here we have only one condition.

Condition: Is it raining?

Decision: Should we carry an umbrella?

Pseudocode

Based on this we can write the below pseudo-code:

IF NOT (It is raining)
THEN
  Go out to play
ELSE
  Stay indoors
END

Truth Table

And the corresponding table for this is below.

[table id=3 /]

NOT Block in PictoBlox

The not () (logical NOT) block is an Operators block and a Boolean block. The block checks if the Boolean block inside it is false. If it is false, the block returns true; if the condition is true, it returns false. This block can be used to “reverse” Booleans.

Activity: NOT with Quarky

Let’s use this block with Quarky.

We are making a code that basically detects whether the left buttons of Quarky are pressed or not. If any of the buttons is pressed then the display of Quarky will show red, otherwise green.

Assignment

Before you move on to the next lesson, a small assignment awaits you!

You must upload the PictoBlox program you created in this activity to the website. Submitting the assignment is a must in order to receive the certificate after completing the course.

Follow the steps below to upload your assignment:

1. Click on Browse.
2. Search and Select your saved Project file(.sb3) and Click Open.
3. Click on Upload to submit the assignment.

The file type allowed is the SB3 file generated from the PictoBlox program. The maximum file size allowed is 5 MB.

Good luck!