Problem
Write a program that allows the user to input any number of hexadecimal characters. Sum the values and display the sum as a hexadecimal value. Within the loop, convert each character entered to its decimal equivalent. Treat each single inputted character as a separate value. Display the original hex value and the corresponding decimal value. For example, if the user inputs F, 15 would be displayed as the decimal equivalent. Use a sentinel value to control the loop. After all values are entered, display the sum of values entered in both hexidecimal and decimal notation.