struct Pixel{
    unsigned char colors[3];
};

Pixel img[iYmax][iXmax];

double nonParallel(){
    clock_t start, end;
    int iX,iY;
    double Cx,Cy;
    const double CxMin=-2.5;
    const double CxMax=1.5;
    const double CyMin=-2.0;
    const double CyMax=2.0;
    double PixelWidth=(CxMax-CxMin)/iXmax;
    double PixelHeight=(CyMax-CyMin)/iYmax;
    const int MaxColorComponentValue=255;
    FILE * fp;
    const char *filename="nonParallel.ppm";
    const char *comment="# ";/* comment should start with # */
    static unsigned char color[3];
    double Zx, Zy;
    double Zx2, Zy2; /* Zx2=Zx*Zx;  Zy2=Zy*Zy  */
    int Iteration;
    const int IterationMax=200;
    const double EscapeRadius=2;
    double ER2=EscapeRadius*EscapeRadius;
    /*create new file,give it a name and open it in binary mode  */
    fp= fopen(filename,"wb"); /* b -  binary mode */
    /*write ASCII header to the file*/
    fprintf(fp,"P6\n %s\n %d\n %d\n %d\n",comment,iXmax,iYmax,MaxColorComponentValue);

    start = clock();
    for(iY=0;iY<iYmax;iY++)
    {
         Cy=CyMin + iY*PixelHeight;
         if (fabs(Cy)< PixelHeight/2) Cy=0.0; /* Main antenna */
         for(iX=0;iX<iXmax;iX++)
         {
                    Cx=CxMin + iX*PixelWidth;
                    /* initial value of orbit = critical point Z= 0 */
                    Zx=0.0;
                    Zy=0.0;
                    Zx2=Zx*Zx;
                    Zy2=Zy*Zy;
                    /* */
                    for (Iteration=0;Iteration<IterationMax && ((Zx2+Zy2)<ER2);Iteration++)
                    {
                        Zy=2*Zx*Zy + Cy;
                        Zx=Zx2-Zy2 +Cx;
                        Zx2=Zx*Zx;
                        Zy2=Zy*Zy;
                    };
                    /* compute  pixel color (24 bit = 3 bytes) */
                    if (Iteration==IterationMax)
                    { /*  interior of Mandelbrot set = black */
                       color[0]=0;
                       color[1]=0;
                       color[2]=0;
                    }
                 else
                    { /* exterior of Mandelbrot set = white */
                         color[0]=255; /* Red*/
                         color[1]=255;  /* Green */
                         color[2]=255;/* Blue */
                    };
                    /*write color to the file*/
                    img[iY][iX].colors[0] = color[0];
                    img[iY][iX].colors[1] = color[1];
                    img[iY][iX].colors[2] = color[2];
                    //fwrite(color,1,3,fp);
            }
    }
    end = clock();
    fwrite(img,1,sizeof(img),fp);
    fclose(fp);
    return ((double) (end - start)) / CLOCKS_PER_SEC * 1000.0;
}