How To Convert Decimal To Binary In Python

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: https://c6e2b6f3635e47b92a26417aa974e72c.safeframe.googlesyndication.com/safeframe/1-0-40/html/container.html

• 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:])```
```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`

Using built-in format method:

Another approach that is using the built-in format() function. This approach involves converting the decimal number to an integer and then using the format() function with the â€˜bâ€™ format specifier to convert it to a binary string. The binary string can then be printed or stored for later use.

Here is an example of how this approach can be used:

• Python
```def decimal_to_binary(decimal_num):
binary_str = format(int(decimal_num), 'b')
return binary_str

print(decimal_to_binary(7))  # prints 111
print(decimal_to_binary(10))  # prints 1010

#This code is contributed by Edula Vinay Kumar Reddy```

Output

```111
1010```

Here is a simple function that you can use to convert a decimal number to a binary number in Python:

```def decimal_to_binary(decimal):
binary = ""while decimal > 0:
binary = str(decimal % 2) + binarydecimal = decimal // 2return binary```

Here’s an example of how you can use this function:

```decimal = 10
binary = decimal_to_binary(decimal)
print(binary) # Output: 1010```

This function works by repeatedly dividing the decimal number by 2 and keeping track of the remainder. The remainders are then concatenated together to form the binary number.

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