Add Digits
2017-04-06 16:34
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Given a non-negative integer num, repeatedly add all its digits until the result has only one digit.
For example:
Given num = 38, the process is like: 3 + 8 = 11, 1 + 1 = 2. Since 2 has only one digit, return it.
For example:
Given num = 38, the process is like: 3 + 8 = 11, 1 + 1 = 2. Since 2 has only one digit, return it.
var addDigits = function(num) {
var str = num.toString(), res = 0, tmp1, tmp2;
for(var i = 0; i < str.length; i++){
res = parseInt(str[i]) + res;
if(res >= 10){
tmp1 = parseInt(res / 10);
tmp2 = res % 10;
res = tmp1 + tmp2;
}
}
return res;
};
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