Goal: Learn to call nested functions.

Question

$($Binary to hex$)$

Write a function that parses a binary number into a hex number. The function header is:

def binaryToHex$($binaryValue$)$

Write a test program that prompts the user to enter a binary number, and displays the corresponding hexadecimal value. Use uppercase letters A$,$ B$,$ C$,$ D$,$ E$,$ F for hex digits.