Introduction to Logical Operators

Overview

• Logical operators allow us to connect and modify Boolean expressions.
• Types of logical operators:
  • Not operator
  • And operator
  • Or operator

Not Operator

• Represented by an exclamation point (!).
• Function: Gives the opposite of a Boolean expression.
  • If x is true, not x is false.
  • If x is false, not x is true.

And Operator

• Represented by two ampersands (&&).
• Function: Returns true only if both expressions are true.
  • x && y is true if both x is true and y is true.
  • Otherwise, it is false.

Or Operator

• Represented by two vertical lines (||).
• Function: Returns true if at least one expression is true.
  • x || y is true if either x or y is true, or both.
  • It is false only if both x and y are false.

Example: Not Operator

• Declare a Boolean variable lightOn and set it to true.
• When not operator is applied:
  • The value of lightOn is switched to false.

Code Example

• Initial State:

  boolean lightOn = true;
  print(lightOn); // Outputs: true
  

• After Applying Not:

  lightOn = !lightOn;
  print(lightOn); // Outputs: false
  

• Repeating Process:
  • Switches back to true if not is applied again.

Practice

• Encouragement to write programs using and, or, and not operators to reinforce understanding.