Nested if Statements

A nested if statement is an if inside another if.
It is used to check conditions within conditions, making it useful for multi-level decision making.

The inner block executes only when the outer condition is True.

This type of statement is commonly used for handling complex logic in programs.

Explanation

• First, outer condition is checked
• If True, inner condition is checked
• If both are True, the code runs
• If outer is False, inner is skipped
• Used when decisions depend on each other

Real-Time Scenarios

• If login correct → then check password
• If ticket available → then check ID
• If exam passed → then check grade
• If ATM card valid → then check PIN
• If user registered → then allow access
  
  

Syntax

if condition1:
    if condition2:
        # block

Example 1

marks = 75
if marks >= 50:
    if marks >= 70:
        print("Good marks")

Output:

Good marks

Example 2

username = "admin"
password = "1234"

if username == "admin":
    if password == "1234":
        print("Login successful")
    else:
        print("Wrong password")
else:
    print("Wrong username")

Output:

Login successful

Explanation

• Outer condition checks username
• Inner condition checks password
• Both must be True for successful login

Why Nested if is Important

• Helps handle multiple related conditions
• Improves logical control
• Used in real-world systems like login and security
• Makes programs more structured

Common Beginner Mistakes

•  Too many nested levels
• Wrong indentation
• Missing conditions
• Not understanding execution flow

➤ Key Points

• Nested if means an if inside another if
• Inner condition runs only if outer is True
• Used for complex conditions
• Helps in better decision making

➤ Tips

• Avoid too many nested levels (keep it simple)
• Use proper indentation
• Combine conditions using and / or when possible
• Practice with real-life examples