Question

Can someone solve this practice exam question, python 3

5. (+15) Write a function bin 2dec ( ) that takes a string representation of any length binary number and returns the decimal equivalent without using any type conversions. Remember that the binary representation ofa number has a power of 2 in each position, starting with 2° in the right most position and increasing by 1 as it moves left (e.g. 222120) loina dec (nun det >>> bin2dec('110') 6 >>>bin2dec('11111111' ) imt (nun) 255 >>> bin2dec( '1') -lo 1

Answer 1

def bin2dec(s):
    product = 1
    decimal = 0
    for x in s[::-1]:
        if (x=='1'):
            decimal += product
        product = product * 2
    return decimal

# Testing
print(bin2dec('110'))
print(bin2dec('11111111'))
print(bin2dec('1'))

$\color{blue}\underline{Output:}$

255 Process finished with exit code 0