This should be a lot of fun!
Here are some great things to think about as you begin your program!
Define a function named ReadDials() that reads each digit and letter dialed into 8 separate char
variables (DO NOT USE ARRAYS). All the digits are sent back through parameters by reference.
Then, for each digit, the program will use a function named ToDigit(), which receives a single
char argument (pass by reference) that may be a number or a letter of one of the digits dialed.
If it is a number, then return 0 by value indicating that it is a valid digit. If the digit is a letter,
then the number corresponding to the letter is returned by reference, and return 0 by value
indicating that it is a valid digit. Here are the letters associated with each digit.
0 5 J K L
1 6 M N O
2 A B C 7 P Q R S
3 D E F 8 T U V
4 G H I 9 W X Y Z
If the digit entered is not one of the valid digits or one of the valid letters, return –1 by value
indicating that you have an invalid digit.
A phone number never begins with a 0, so the program should flag an error if such a number is
entered. Make ReadDials() return –2 in this case.