題目:
https://onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=25&page=show_problem&problem=2307
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| #include <iostream>
using namespace std;
int main(){
int n, sum;
while(cin >> n){
if(n == 0) break;
sum = n;
while(sum >= 10){
n = sum;
int tmp = 0;
while(n > 0){
tmp += n%10;
n /= 10;
}
sum = tmp;
}
cout << sum << '\n';
}
return 0;
}
|
