Nested If

A nested if is an if statement placed inside another if statement.

It is used when a decision depends on another decision.

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How Nested If Works

Conceptually:

• Check the outer condition first
• If true, check the inner condition
• The inner condition only runs if the outer one is true

Example (Python)

age = 20
has_ticket = True

if age >= 18:
    if has_ticket:
        print("You may enter.")
    else:
        print("You need a ticket.")
else:
    print("You are underage.")

Explanation:

• The program checks age >= 18 first
• Only then does it check has_ticket

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When to Use Nested If

Use nested if statements when:

• one condition depends on another
• checks must happen in a specific order

⚠️ Be careful: Too many nested conditions can make code hard to read.

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Summary

• Nested if means an if inside another if
• Conditions are evaluated step by step
• Useful, but should be used carefully