题解 | #Digital Roots#
Digital Roots
https://www.nowcoder.com/practice/cef727d0af33479c9fb4a9c120702414
#include <iostream>
using namespace std;
int x = 0;
int checkSum (int n){
int sum = 0;
while (n != 0){
sum += n % 10;
n /= 10;
}
x = sum;
if (x >= 10){
checkSum(x);
}
return x;
}
int main() {
int n;
while(scanf ("%d", &n) != EOF){
cout << checkSum(n) << endl;
}
}
初出茅庐，请多指教
