C++ primer P99 练习3.23

#include <iostream>#include <string>#include <vector>using namespace std;int main(){   vector<int> vec;   int num;   int count=0;   cout << "please input 10 numbers:" << endl;   while (cin >> num&&count<10){      vec.push_back(num);      count++;   }   for (auto it = vec.begin(); it != vec.end(); it++){      (*it) *= 2;      cout << *it << " ";   }   cout << endl;   return 0;}