c – 如何将字符串转换为浮点数组？

#include <string>
#include <vector>
#include <algorithm>
#include <iterator>
#include <iostream>
#include <cassert>
#include <sstream>

int main () {
  std::string Numbers = "0.3 5.7 9.8 6.2 0.54 6.3";

  // If possible,always prefer std::vector to naked array
  std::vector<float> v;

  // Build an istream that holds the input string
  std::istringstream iss(Numbers);

  // Iterate over the istream,using >> to grab floats
  // and push_back to store them in the vector
  std::copy(std::istream_iterator<float>(iss),std::istream_iterator<float>(),std::back_inserter(v));

  // Put the result on standard out
  std::copy(v.begin(),v.end(),std::ostream_iterator<float>(std::cout,","));
  std::cout << "n";
}