Program for Decimal to Binary Conversion in Python

Decimal to Binary Conversion

Converting a decimal number to binary involves representing the number in base-2, where each digit is either 0 or 1.

We will explore three methods to perform this conversion using Python programming.

Method 1: Using Built-in Function

We use Python's built-in bin() function to convert a decimal number to binary.

def decimal_to_binary_builtin(n):
    return bin(n)[2:]

num = int(input("Enter a decimal number: "))
print("Binary:", decimal_to_binary_builtin(num))
            

Method 2: Using Division by 2

We repeatedly divide the number by 2 and store the remainder.

def decimal_to_binary_division(n):
    binary = ""
    while n > 0:
        binary = str(n % 2) + binary
        n //= 2
    return binary or "0"

num = int(input("Enter a decimal number: "))
print("Binary:", decimal_to_binary_division(num))
            

Method 3: Using Recursion

We use recursion to keep dividing the number by 2 until it becomes 0, printing the remainder in reverse order.

def decimal_to_binary_recursive(n):
    if n == 0:
        return ""
    return decimal_to_binary_recursive(n // 2) + str(n % 2)

num = int(input("Enter a decimal number: "))
print("Binary:", decimal_to_binary_recursive(num) or "0")