c++ istream_iterator ostream_iterator example

zxcvb036

于 2019-12-26 13:08:20 发布

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分类专栏： c++

原文链接：http://www.cplusplus.com/reference/iterator/istream_iterator/?kw=istream_iterator

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// ostream_iterator example
#include <iostream>     // std::cout
#include <iterator>     // std::ostream_iterator
#include <vector>       // std::vector
#include <algorithm>    // std::copy

int main () {
  std::vector<int> myvector;
  for (int i=1; i<10; ++i) myvector.push_back(i*10);

  std::ostream_iterator<int> out_it (std::cout,", ");
  std::copy ( myvector.begin(), myvector.end(), out_it );
  return 0;
}

// istream_iterator example
#include <iostream>     // std::cin, std::cout
#include <iterator>     // std::istream_iterator

int main () {
  double value1, value2;
  std::cout << "Please, insert two values: ";

  std::istream_iterator<double> eos;              // end-of-stream iterator
  std::istream_iterator<double> iit (std::cin);   // stdin iterator

  if (iit!=eos) value1=*iit;

  ++iit;
  if (iit!=eos) value2=*iit;

  std::cout << value1 << "*" << value2 << "=" << (value1*value2) << '\n';

  return 0;
}