Python program to convert decimal to binary number

Difficulty Level : Easy
Last Updated : 05 Mar, 2021

Given a decimal number as input, the task is to write a Python program to convert the given decimal number into equivalent binary number.
Examples :

Input : 7                                                         
Output :111

Input :10
Output :1010

Method #1: Recursive solution

DecimalToBinary(num):
        if num >= 1:
            DecimalToBinary(num // 2)
            print num % 2

Below is the implementation of above recursive solution:

Python3

# Function to convert decimal number
# to binary using recursion
def DecimalToBinary(num):
     
    if num >= 1:
        DecimalToBinary(num // 2)
    print(num % 2, end = '')
 
# Driver Code
if __name__ == '__main__':
     
    # decimal value
    dec_val = 24
     
    # Calling function
    DecimalToBinary(dec_val)

Output

Method #2: Decimal to binary using in-built function

Python3

# Python program to convert decimal to binary
   
# Function to convert Decimal number
# to Binary number
def decimalToBinary(n):
    return bin(n).replace("0b", "")
   
# Driver code
if __name__ == '__main__':
    print(decimalToBinary(8))
    print(decimalToBinary(18))
    print(decimalToBinary(7))

Output

1000
10010
111

Method #3:Without in-built function

Python3

# Python program to convert decimal to binary
   
# Function to convert Decimal number
# to Binary number
def decimalToBinary(n):
    return "{0:b}".format(int(n))
   
# Driver code
if __name__ == '__main__':
    print(decimalToBinary(8))
    print(decimalToBinary(18))
    print(decimalToBinary(7))

Output

1000
10010
111

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