double to string to double

#include "assert.h"

#include <cmath>
#include <limits>
#include <sstream>
#include <iomanip>
#include <iostream>




int main(int argc, char* argv[])
{
    //testReadWrite();
    int     const Prec = 35;
    double d0 = 0.0070000000000000001;
    double d1 = 0.007000000000000001;
    double d2 = 0.00700000000000001;
    //double d3 = 0.0070000000000000097;
    char    buffer[100];
    std::ostringstream out;

    memset(buffer,0,sizeof(buffer));
    out.precision(Prec);
    std::string  test1;

    out << d0;
    test1 = out.str();

    out << "    ";
    out << d1;
    out << "    ";
    out << d2;

    double d0_;
    double d1_;
    double d2_;

    std::istringstream in (out.str());
    in.precision(Prec);
    double d0X_ = strtod(test1.c_str(),NULL);

    in >> d0_;
    in >> d1_;
    in >> d2_;

    assert(d0 == d0X_); // this is ok
    assert(d0 == d0_);   //this failes?!?!?!

    long long l0= *reinterpret_cast<long long *> (&d0);
    long long l1= *reinterpret_cast<long long *> (&d1);
    long long l2= *reinterpret_cast<long long *> (&d2);

    long long l0_= *reinterpret_cast<long long *> (&d0_);
    long long l1_= *reinterpret_cast<long long *> (&d1_);
    long long l2_= *reinterpret_cast<long long *> (&d2_);
    return 0;
}