THE LAST SUM

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Problem description. You have been given a number. Your job is to find the sum of its digits until the sum is a single digit number. Input Input is a single number 'n'. Output Output is a single digit numeral.. Constraints - 119 Example Input: 5670813215 Output: 2 Explanation Example case 1. 5+6+7+0+8+1+3+2+1+5=38 3+8=11 1+1=2

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solution.cppC++17

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