➕ C# Logical Operators – Combine Conditions with AND, OR, and NOT

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🧲 Introduction – Why Use Logical Operators in C#

In real-world programming, decisions often depend on multiple conditions. Logical operators in C# help you combine or negate boolean expressions to control program flow more precisely. They’re critical in if, while, and for statements.

🎯 In this guide, you’ll learn:

• The types of logical operators in C#
• How to use AND, OR, and NOT in conditions
• Practical examples with outputs
• Best practices for writing clean logic

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🔍 Core Concept – What Are Logical Operators?

Logical operators work with boolean (bool) values and expressions. They are used to form compound conditions and return a true or false result.

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🔣 List of Logical Operators in C#

Operator	Symbol	Name	Description
AND	&&	Logical AND	Returns true if both conditions are true
OR	`		`
NOT	!	Logical NOT	Reverses a boolean value

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💻 Code Example – Logical Operators in Action

using System;

class LogicalDemo
{
    static void Main()
    {
        int age = 20;
        bool hasID = true;

        if (age >= 18 && hasID)
        {
            Console.WriteLine("Entry permitted.");
        }
        else
        {
            Console.WriteLine("Entry denied.");
        }

        bool isMember = false;
        if (!isMember)
        {
            Console.WriteLine("Guest access only.");
        }
    }
}

📤 Output:

Entry permitted.  
Guest access only.

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🧠 Practical Use Cases

Condition	Expression
Is adult AND has ID	age >= 18 && hasID
Score below 50 OR failed exam	`score < 50
NOT enrolled in course	!isEnrolled

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⚖️ Truth Table – Logical AND (&&)

A	B	A && B
true	true	true
true	false	false
false	true	false
false	false	false

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⚖️ Truth Table – Logical OR (||)

A	B	A || B
true	true	true
true	false	true
false	true	true
false	false	false

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💡 Tips, Pitfalls & Best Practices

💡 Tip: Use parentheses () to group conditions clearly and ensure correct precedence.

⚠️ Pitfall: Avoid writing if (isTrue == true) — just use if (isTrue).

📘 Best Practice: Keep conditions readable and logically independent for maintainability.

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📌 Summary – Recap & Next Steps

Logical operators allow you to build complex conditional expressions. Mastering &&, ||, and ! helps create smarter and more dynamic control flows.

🔍 Key Takeaways:

• Use && to require multiple conditions to be true
• Use || to allow any condition to pass
• Use ! to negate boolean values

⚙️ Next: Explore ➕ C# Bitwise Operators for binary-level operations and optimizations.

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❓ FAQ – C# Logical Operators

❓ What does && mean in C#?
✅ It’s the logical AND operator. Returns true if both conditions are true.

❓ How is || different from &&?
✅ || returns true if at least one condition is true. && needs both to be true.

❓ Can I combine multiple logical operators in one statement?
✅ Yes. Use parentheses to control evaluation order: (a && b) || c.

❓ What does the ! operator do?
✅ It negates the value — !true becomes false.

❓ Are logical operators short-circuiting in C#?
✅ Yes. In a && b, b is not evaluated if a is false. In a || b, b is skipped if a is true.

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