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C++ Program to Convert Double to String

#include <iostream>     // std::cout, std::ios
#include <sstream>      // std::ostringstream
using namespace std;
std::string doubleToString(double val)
{
    std::ostringstream out;
    out << std::fixed << val;
                return out.str();
}
int main()
{
    cout << doubleToString(554.2) << endl;
                return 0;
}
/*
OUTPUT:
554.200000
*/