Write a Python program to convert decimal to binary

In this post, you will learn how to convert a decimal into an equivalent binary number using Python programming language. Here, we have mentioned three ways to convert a decimal to binary number.

Using recursive function

A recursive function is a function that calls itself during its execution. For this, we have defined a function and taken a decimal number as an input and convert to equivalent binary number.

# Function to convert a 
# decimal number to binary

def convertDecimalToBinary(x):
    
    if x > 1:
        convertDecimalToBinary(x // 2)
    print(x % 2, end='')


# Get user input
num = int(input("Enter a decimal number: "))

convertDecimalToBinary(num)

Enter a decimal number: 23
10111
Enter a decimal number: 53
110101
Enter a decimal number: 90
1011010

Using bin() function

The bin() is an inbuilt function of Python that takes a decimal value and returns an equivalent binary representation of that. The following example demonstrates this -

Enter a decimal number: 52
Equivalent Binary Number:  110100

Enter a decimal number: 84
Equivalent Binary Number:  1010100

Enter a decimal number: 93
Equivalent Binary Number:  1011101

Without inbuilt function

The following program converts a decimal to binary number without using any inbuilt function -

# Function to convert a 
# decimal number to binary

def convertDecimalToBinary(num): 
    return "{0:b}".format(int(num))
   
# print equivalent binary number
if __name__ == '__main__': 
    print("Equivalent Binary Number: ",convertDecimalToBinary(43)) 
    print("Equivalent Binary Number: ",convertDecimalToBinary(14)) 
    print("Equivalent Binary Number: ",convertDecimalToBinary(70)) 

Equivalent Binary Number:  101011
Equivalent Binary Number:  1110
Equivalent Binary Number:  1000110

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