Python Program to Convert Decimal to Binary Without Using bin() | Python Interview Question

Published: 26 January 2026
on channel: CodersIndia

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In this video, we solve Question 22: Convert a decimal number into binary in Python without using the built-in bin() function.

We explain step by step:

What is binary number system

Why interviewers ask decimal to binary conversion

How modulus (% 2) works

How floor division (// 2) works

How to build binary number manually using a loop

Python code explanation line by line

This method is very important for:

Coding interviews

Python beginners

DSA fundamentals

Logic building

Example Covered:
Input: 122
Output: 1111010

We do not use any built-in function, so you clearly understand the core logic.

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