[英]How do you convert a string into an array of floats?
How would you convert a string, lets say: string Numbers = "0.3 5.7 9.8 6.2 0.54 6.3";
你会如何转换一个字符串,比如说:
string Numbers = "0.3 5.7 9.8 6.2 0.54 6.3";
into a float array, such as: float Numbers[6] = {0.3, 5.7, 9.8, 6.2, 0.54, 6.3};
进入浮点数组,例如:
float Numbers[6] = {0.3, 5.7, 9.8, 6.2, 0.54, 6.3};
? ?
I would use data structures and algorithms from std::
: 我会使用
std::
数据结构和算法:
#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";
}
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