C++ Converting a String to Double

Question

I\'ve been trying to find the solution for this all day! You might label this as re-post but what I\'m really looking for is a solution without using boost lexical c

Answer 1

Since C++11 you could use std::stod function:

string line; 
double lineconverted;

try
{
    lineconverted = std::stod(line);
}
catch(std::invalid_argument)
{
    // can't convert
}

But solution with std::stringstream also correct:

#include 
#include 
#include 

int main()
{
    std::string str;
    std::cin >> str;
    std::istringstream iss(str);
    double d = 0;
    iss >> d;
    std::cout << d << std::endl;
    return 0;
}