3.19 – Reverse a Number Using While Loop | Digit Logic Program | Python Programming – New Series

Описание: Welcome to the Python Programming – Complete Course (New Series) by Burle Sharma.

In this class (3.19), we continue working with digit-based number programs and learn how to reverse a number using a while loop.

In this video, I have solved the following program:

👉 Write a program to accept a number and display the reverse of the number.

To help students understand the logic clearly, I have followed the structured learning approach used in previous classes.

In this video, I have:

✔ Written the expected output clearly
✔ Written the complete program
✔ Performed a detailed dry run step-by-step
✔ Executed the program and verified the output
✔ Explained why while loop is used in this type of problem

🎓 What You’ll Learn in This Video

• Accepting number input from the user
• Extracting digits from a number
• Reversing digits logically
• Using modulus (%) operator
• Using integer division (//)
• Building a number step-by-step
• Understanding when to use while loop
• Performing detailed dry run

🧠 Program: Reverse a Number

Example:

Input: 456

Process:
Digits → 4, 5, 6

Reverse → 654

Output:
Reverse Number = 654

Logic

✔ Accept a number from the user
✔ Initialize reverse = 0
✔ Use while loop until the number becomes 0
✔ Extract last digit using % operator
✔ Build reverse number using:
  reverse = reverse * 10 + digit
✔ Remove last digit using // operator
✔ Display the reversed number

🧠 Key Learning Concept

This program again shows why while loop is very useful.

We use while loop when:

✔ The number of iterations is not known beforehand
✔ The loop should continue until a condition becomes false

In this case, the loop runs until the number becomes 0, so while loop is the best choice.

🎯 Why This Video Is Important

This program is very important because it helps students:

• Understand digit manipulation
• Strengthen number logic
• Practice loop control
• Prepare for advanced problems like:

Palindrome number

Armstrong number

Digit-based mathematical programs

These concepts are widely used in programming interviews and exams.

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