Question: Take a number as input and repeatedly sum all the digits until a single digit is counted. E.g. id= 98347989, sum= 57, sum=12, sum=3. Answer=3.

Take a number as input and repeatedly sum all the digits until a single digit is counted. E.g. id= 98347989, sum= 57, sum=12, sum=3. Answer=3. use c++ to slove this problem

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