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-rw-r--r--other/add_digits.cpp26
1 files changed, 26 insertions, 0 deletions
diff --git a/other/add_digits.cpp b/other/add_digits.cpp
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+// 258. Add Digits
+#include "leetcode.h"
+
+// given an integer 'num', repeatedly add all its digits until
+// the result has onlye one digit and return it
+
+class Solution {
+public:
+ int addDigits(int num) {
+ int sum = 0;
+ while (num) {
+ sum += num % 10;
+ num /= 10;
+ }
+ if (sum < 10)
+ return sum;
+ else
+ return addDigits(sum);
+ }
+};
+
+int main() {
+ Solution obj;
+ printf("%d\n", obj.addDigits(38)); // expect: 2
+ printf("%d\n", obj.addDigits(0)); // expect: 0
+}