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Python program to convert decimal to binary number

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  • Difficulty Level : Easy
  • Last Updated : 17 Oct, 2022
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Given a decimal number as input, the task is to write a Python program to convert the given decimal number into an 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: 

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

011000

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

Quick Ninja Method: One Line Code to Convert Decimal to Binary with user input

Python3




# Quick Ninja One line Code
print(bin(4785)[2:])

Output

1001010110001

or 

Python3




# Use this for user input
#decNum = int(input("Enter any Decimal Number: "))
 
decNum = 4785
print(bin(decNum)[2:])
 
decNum1 = 10
print(bin(decNum1)[2:])
 
decNum2 = 345
print(bin(decNum2)[2:])

Output

1001010110001
1010
101011001

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()

Output

The binary of the number 60 is 111100

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