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Add_digits.cpp

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class Solution {

public:

int addDigits(int num) {

/*

while(true) {

int backup = num;

int sum = 0;

while(num > 0) {

sum += (num % 10);

num /= 10;

}

num = backup;

if(num == sum) {

return num;

}

num = sum;

}

return num;

*/

if(num == 0) return num;

int mod = num % 9;

return (mod != 0) ? mod : 9;

}

};