C++ Primer第四版习题--3.18

#include <iostream>#include <vector>//#include <cctype>int main(){    std::vector<int> ivec(10, 0);    int num;    for(std::vector<int>::iterator iter=ivec.begin(); iter!=ivec.end();        ++iter)    {        std::cin >> num;        *iter=2*num;        std::cout << *iter << "\t";    }    std::cout << std::endl;    return 0;}