(Hex to binary)

Question

Write a program that prompts the user to enter a hex digit and displays its corresponding binary number.

Sample Run 1

Enter a hex digit: B

The binary value is 1011

Sample Run 2

Enter a hex digit: b

The binary value is 1011

Sample Run 3

Enter a hex digit: T

Invalid input

Answer 1

The easiest way to do it is probably with a int() and a bin() function.

int(value, number_system) convert an expression to a integer object

eg.

int('A', 16) # -> 10

int('12', 8) # -> 10

bin(int) return an expression of an integer in its binary format

eg.

bin(3) # -> '0b11'

Thus the Solution will be

def isHexDigit(digit):

# Helper function to determine whether digit is legitimate hex digit

if isdigit(digit):

return True

if upper(digit) < 'H' and upper(digit) >= 'A':

return True

return False

def hexToBin(digit):

if not isHexDigit(digit):

print('Invalid input')

return

binaryEx = bin(int(digit, 16))

print("The binary value is %s", binaryEx)