Question: Write a recursive function that receives a number and adds up all its digits in stages until all they have been added up to 1

Write a recursive function that receives a number and adds up all its digits in stages until all they have been added up to 1 digit and return this number:

For Example adddigits(n)

It recursively calls itself three times for input 123457

123457 -> 18 -> 9

123457 it adds 1+2+3+4+5+7 = 18

Then it receives 18 it adds up 1+8 = 9

C++ Programming

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