# Python Convert the binary number to decimal without using a library function

Twofold to decimal in Python: Here, we will figure out how to change over the given paired number to the decimal number without utilizing any library work in Python?

Given a twofold number and we need to change over it into decimal without utilizing library work.

### Example:

``````    Input:
1010

Output:
10``````

### Python code to change over twofold to decimal:

``````# Python code to convert binary to decimal
def binToDec(bin_value):

# converting binary to decimal
decimal_value = 0
count = 0

while(bin_value != 0):
digit = bin_value % 10
decimal_value = decimal_value + digit * pow(2, count)
bin_value = bin_value//10
count += 1

# returning the result
return decimal_value

# main code
if __name__ == '__main__':
binary = int(input("Enter a binary value: "))
print("decimal of binary ", binary, " is: ", binToDec(binary))

binary = int(input("Enter another binary value: "))
print("decimal of binary ", binary, " is: ", binToDec(binary))

binary = int(input("Enter another binary value: "))
print("decimal of binary ", binary, " is: ", binToDec(binary))
``````

### Output:

``````Enter a binary value: 1010
decimal of binary  1010  is:  10
Enter another binary value: 1111000011
decimal of binary  1111000011  is:  963
Enter another binary value: 10000001
decimal of binary  10000001  is:  129 ``````
error: Alert: Content is protected!!