Write a program that will iterate over the input, adding the digits, and returning the result

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Write a program that will iterate over the input, adding the digits, and returning the result.

Input:

- MUST accept STDIN as the default

- MUST accept a file when flag [-f] is specified

- MUST handle hex values when flag [-x] is specified

Output:

- MUST output result as Long to STDOUT

- MUST always output result in base 10

Be sure to include:

- README on how to build/test/execute your application

- Automated Unit Tests

Examples:

$ echo "abc123" | ./myProg

6

$ echo "abc123" | ./myProg -x

39

$ echo "qq" | ./myProg

0

$ echo "abc123" > file.tmp

$ ./myProg -f file.tmp

6