Python Program to Convert Decimal to Binary Number

In this article, we’ll look at some programs that translate decimal numbers into their binary equivalents. Two Python programmes will be shown; the first program performs the conversion using a user-defined function, and the second program uses the built-in function bin() for the conversion of decimal to binary. The assignment is to create a Python program that will translate a given decimal number into its 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 the above recursive solution:

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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

Using the bitwise shift operator >>.

Python3

def dec2bin(number: int):
    ans = ""
    if ( number == 0 ):
        return 0
    while ( number ):
        ans += str(number&1)
        number = number >> 1
    
    ans = ans[::-1]
    return ans
def main():
    number = 60
    print(f"The binary of the number {number} is {dec2bin(number)}")
# driver code
if __name__ == "__main__":
    main()