# Python Program to Convert Binary Number to Decimal and Vice-Versa

A binary number is a number expressed in the base-2 numeral system or binary numeral system, which uses only two symbols 0 and 1.

The decimal numeral system is the standard system for denoting integer and non-integer numbers.

All decimal numbers can be converted to equivalent binary values and vice versa for example, the binary equivalent of “2” is “10” to explore more visit binary to decimal converter.

In this article, we will create python programs for converting a binary number into decimal and vice versa

## Convert Binary to Decimal

``````# Taking binary input
binary = input("Enter a binary number:")

# Calling the function
BinaryToDecimal(binary)

def BinaryToDecimal(binary):
decimal = 0
for digit in binary:
decimal = decimal*2 + int(digit)
print("The decimal value is:", decimal)``````

### Output

``````Enter a binary number:10
The decimal value is: 2
``````

### Pythonic way to convert binary into decimal

We can use the built-in `int()` function to convert binary numbers into decimals. The `int()` function converts the binary string in base 2 number.

``````binary_string = input("Enter a binary number :")

try:
decimal = int(binary_string,2)
print("The decimal value is :", decimal)

except ValueError:
print("Invalid binary number")
``````

### Output

``````Enter a binary number :10
The decimal value is : 2``````

## Convert Decimal number into Binary number

``````decimal = input("Enter a decimal number :")

# Calling the function
DecimalToBinary(int(decimal))

def DecimalToBinary(decimal):
if decimal > 1:
DecimalToBinary(decimal // 2)
print(decimal % 2, end = '')``````

### Output

``````Enter a decimal number :22
10110``````

### Pythonic way to convert decimal into binary

Python has  `bin()` method to convert decimal numbers into binary. The `bin()` method converts and returns the binary equivalent string of a given integer.

``````decimal = input("Enter a binary number :")

binary = bin(int(decimal)).replace("0b", "")
print("The decimal number is :", binary)``````

### Output

``````Enter a binary number :10
The decimal number is : 1010``````

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1. very useful.