Vfrdtyky

Im having problems understanding how to write a PGM file using data.
This function i have overwrites the existing txt document instead of creating a PGM file.
Im unsure whether my issue is lies within my Read_text function or somewhere else. Can anyone help me understand this issue and fix it please?

double* read_text(char *fileName, int sizeR, int sizeC)

{

    double* data = new double[sizeR*sizeC];

    int i = 0;

    std::ifstream myfile(fileName);

    if (myfile.is_open())

    {

        while (myfile.good())

        {

            if (i>sizeR*sizeC - 1) break;

            myfile >> *(data + i);

            std::cout << *(data+i) << ' '; //This line display the converted data on the screen, you may comment it out. 

            i++;

        }

        myfile.close();

    }

    else std::cout << "Unable to open file";

    std::cout << i;

    return data;

}



void write_pgm(char *filename, double *data, int sizeR, int sizeC, int Q)

{

    int i, j;

    unsigned char *image;

    std::ofstream myfile;



    image = (unsigned char *) new unsigned char[sizeR*sizeC];



    // convert the integer values to unsigned char



    for (i = 0; i<sizeR*sizeC; i++)

        image[i] = (unsigned char)data[i];



    myfile.open(filename, std::ios::out | std::ios::binary | std::ios::trunc);



    if (!myfile) {

        std::cout << "Can't open file: " << filename << std::endl;

        exit(1);

    }



    myfile << "P5" << std::endl;

    myfile << sizeC << " " << sizeR << std::endl;

    myfile << Q << std::endl;



    myfile.write(reinterpret_cast<char *>(image), (sizeR*sizeC)*sizeof(unsigned char));



    if (myfile.fail()) {

        std::cout << "Can't write image " << filename << std::endl;

        exit(0);

    }



    myfile.close();

    std::cout << "Finsihed " << std::endl;

    delete image;



}    

void main() {

    double* data = read_text("Wally_grey.txt", rows(), columns());

    std::cout << data << std::endl;

    write_pgm("Wally_grey.txt",data, rows(), columns(), 255);

    getchar();

}