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# Python program to convert decimal to binary number

• Difficulty Level : Easy
• Last Updated : 29 May, 2021

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```

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