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braking him

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I have the following problem: I have an integer number consisting of 1 to 5 numbers, for instance 1(one number:1),1234(four numbers-1,2,3,4)and so on... Part of problem i summing up all the nubers of the nuber(for instance 1234 is 1,2,3,4 so sum is 10).As i said, i dont know the length of nubmber in advance.I am wondering if there is a way to find how many numbers are contained within number, how to brake it and the sum all of them.I tried doing division and modulus operations so for instance 22/10=2(integer, so no remainder) and 22%10=2(this is the remainder) so the sum is 2+2=4, in this case i know that there are two numbers, so it is not applicable.If anyone knows some algorithm(s) and c++ code i would be grateful!

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