Chapter 12 - Programming Exercise #4: Sum of Digits in a String.

Chapter 12 - Programming Exercise #4: Sum of Digits in a String. HINT: You will need to create a utility procedure that allows you to convert from a character to an integer value to allow you to sum the values of the digits in a string. Also, Raptor will not allow you to input a numeric value and treat it as a String input. To work around this limitation, I would recommend putting a character like 'a' somewhere in your input value so Raptor will treat the input as a String data type. Your program should be designed in such a way that it will ignore any non-numeric characters in the input string.
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