Operators in Computers: Math, Relational, and Logic

Operators are the symbols that tell the computer what action to perform on data.

In this lesson you’ll learn the three core families you’ll use everywhere:

• Mathematical operators (e.g., +, -, *, /, Mod, ^)
• Relational operators (e.g., =, <, >, <=, >=, <>)
• Logical operators (e.g., AND, OR, NOT)
  You’ll also see truth tables, how computers view True = 1 and False = 0, and realistic decision examples. 

1️⃣ Operator Types

• Mathematical: arithmetic on numbers
• Relational: compare two values → returns True/False
• Logical: combine/negate conditions (True/False) 

2️⃣ Mathematical Operators

3️⃣ Relational Operators (comparisons return True/False)

4️⃣ Logical Operators (work on True/False)

Logic in marriage

Your wife is always right no matter what, and you are always wrong :-)

Logic in computer

5️⃣ From Real Life to Computer Logic

The slides illustrate logic with everyday statements (“logic in marriage/life”) and then map that to computer-style logic with AND / OR / NOT. This helps you see how conditions become code decisions.

Practical AND example (hiring rule):
“You must meet both conditions to be hired:

• Age ≥ 21 AND Has a driver license.
  Computer form: (Age >= 21) AND (HasDriverLicense = True)
  A single False in AND → result False (not hired).

Practical OR example (hiring rule):
“You must meet at least one:

• Age ≥ 21 OR Has a driver license.”
  Computer form: (Age >= 21) OR (HasDriverLicense = True)
  Any True in OR → result True (hired).

6️⃣ AND Operator

7️⃣ OR Operator

7️⃣ NOT Operator

Practical Example:

I want to hire only Males , so you can say in computer:

• If Male then hire
• or you can use Not: If not (Female) then hire. because not female means male
  

🔗 Interconnection

• Math operators compute values; Relational compare values; Logical combine decisions.
• Computers evaluate conditions as True/False (i.e., 1/0) and use AND/OR/NOT to decide flow.
• Real policies (like hiring rules) translate directly into logical expressions you can code.

By mastering these, you’ll express real-world rules precisely and build reliable decisions in programs. 🚀