Boolean Logic: Truth Values

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Boolean Logic: Truth Values
Robots need to know, very clearly, which choice to make under what circumstances. As a consequence, their decisions are always based on the answers to questions which have only two possible answers: yes or no, trueor false.


Statements that can be only true or false are called Boolean statements,
and their true-or-false value is called a truth value.

Here are some examples of Boolean Statements Robots can answer!

Boolean Statement 1: The sky is blue.

Boolean Statement 2: It snows during summer.
Loops and If-Else conditional statements in ROBOTC are always Boolean statements!
They are always either true or false at any given moment.

Robot C Boolean Statement 1:
Value from the Distance Sensor is (currently) less than 200.

Because the current value is 496
(NOT less than 200).

Robot C Boolean Statement 2:
Value from the Distance Sensor is (currently) less than 200.

Because the current value is 84
(less than 200).

Did you know?

Boolean Logic: Comparison Operators

Comparisons (such as the comparison of the Ultrasonic sensor’s value against the number 200)
are at the core of the decision-making process.
Here are some of the most common ones recognized by ROBOTC.
ROBOTC Symbol Meaning Sample comparison Result
"is equal to" 50 == 50
50 == 100
100 == 50
"is not equal to" 50 != 50
50 != 100
100 != 50
"is less than" 50 < 50
50 < 100
100 < 50
"is less than or equal to" 50 <= 50
50 <= 100
100 <= 50
"is greater than" 50 > 50
50 > 100
100 > 50
"is greater than or equal to" 50 >= 50
50 >= 100
100 >= 50
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