
Sum of Digits in a String
Design a program that asks the user to enter a string containing a series of single digit numbers with nothing separating them. The program should display the sum of all the single digit numbers in the string. For example, if the user enters 2514, the method should return 12, which is the sum of 2, 5, 1, and 4. (Hint: The string-ToInteger library function can be used to convert a single character to an integer.)

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