Write a recursive function that parses a hex number as a string into a decimal integer. The function header is as follows: def hexToDecimal(hexString): Write a test program that prompts the user to...

Write a recursive function that parses a hex number as a string into a decimal integer. The function header is as follows:
def hexToDecimal(hexString):
Write a test program that prompts the user to enter a hex string and displays its decimal equivalent.