Swift Nested if Statement

🧩 Swift Nested `if` Statement – Complete Beginner Guide

In Swift, a nested if statement refers to putting one if statement inside another.
It is using when a decision relies on several conditions evaluated one at a time.

1️⃣ What is Nested `if` in Swift? ⭐

A nested if is using when:

First condition must be true
Then another condition is checked inside it

Syntax

2️⃣ Simple Nested `if` Example ⭐

Output

📌 Second if runs only if first condition is true.

3️⃣ Nested `if–else` Example ⭐⭐

Output

4️⃣ Nested `if` with Multiple Conditions ⭐⭐

Output

5️⃣ Nested `if` vs Logical Operators ⭐⭐⭐

Nested `if`

Using Logical AND (`&&`) – Better Way

📌 Interview tip:
Nested if is useful when different actions are needed at each level.

6️⃣ Nested `if` with Boolean Values ⭐⭐

Output

7️⃣ Common Mistakes ❌

❌ Missing braces { }
❌ Too many nested levels (hard to read)
❌ Using nested if when && is enough
❌ Confusing = with ==

📌 Interview Questions (Swift Nested if)

Q1. What is nested if?
👉 An if inside another if

Q2. When should nested if be used?
👉 When conditions depend on previous conditions

Q3. Can nested if be replaced by logical operators?
👉 Yes, in simple cases using && or ||

✅ Summary

✔ Nested if = if inside if
✔ Used for dependent conditions
✔ Improves decision control
✔ Avoid deep nesting (use logical operators)
✔ Common in authentication & grading logic

Swift Nested if Statement