C++: Save Data To A Local File That Humans Can Read

I want to save a little data into a local file that we read it. It is best done conveniently through C Plus Plus.
The following example shows the entire logic.

#include <iostream>
#include <vector>
#include <fstream>

using namespace std;

std::string filePath = "txt";

void WriteData()
{
    double origin[3] = { 0, 0, 0 };
    double scale[3] = { 1, 1, 1 };
    double orientation[3] = { 0, 0, -6.84607 };
    double position[3] = { -0.33, -4.7, 0.8 };

    ofstream output;
    output.open( filePath.c_str(), ios::binary );
    if( output.is_open() == false )
    {
        cout << "open failed: " << filePath.c_str() << endl;
        return;
    }

    for( int i = 0; i < 3; ++i )
    {
        output << origin[i] << "\t";
    }
    output << std::endl;

    for( int i = 0; i < 3; ++i )
    {
        output << scale[i] << "\t";
    }
    output << std::endl;

    for( int i = 0; i < 3; ++i )
    {
        output << orientation[i] << "\t";
    }
    output << std::endl;

    for( int i = 0; i < 3; ++i )
    {
        output << position[i] << "\t";
    }
    output << std::endl;
    output << "finished";

    output.close();
    cout <<  "finished\n";
}


void ReadData()
{
    ifstream input;
    input.open( filePath.c_str(), ios::binary );
    if (input.is_open() == false)
    {
        cout << "open failed: " << filePath << endl;
        return;
    }
    std::string str = "\t";
    double origin[3];
    for( int i = 0; i < 3; ++i )
    {
        input >> origin[i];
        cout << origin[i] << str;
    }
    cout << endl;

    double scale[3];
    for( int i = 0; i < 3; ++i )
    {
        input >> scale[i];
        cout << scale[i] << str;
    }
    cout << endl;

    double orientation[3];
    for( int i = 0; i < 3; ++i )
    {
        input >> orientation[i];
        cout << orientation[i] << str;
    }
    cout << endl;

    double position[3];
    for( int i = 0; i < 3; ++i )
    {
        input >> position[i];
        cout << position[i] << str;
    }
    cout << endl;

    input >> str;
    if( str == "finished" )
    {
        cout << "Read successfully!\n";
    }

    input.close();
}

int main()
{
    WriteData();
    ReadData();
    return 0;
}

Output:

finished
0    0    0
1    1    1
0    0    -6.84607
-0.33    -4.7    0.8
Read successfully!

The local file: