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这么简单的错那了?#include<iostream> using namespace std; int main() { int n; while(cin>>n&&n) { int s=0; loop: while(n) { s+=n%10; n/=10; } if(s>=10){n=s;s=0;goto loop;} else n=s; cout<<n<<endl; } return 0; } Followed by:
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