GS UPR 3

#include <iostream>
#include <graphics.h>
using namespace std;

int main()
{
    int n = 80;
    double xmin;
    double xmax;

    xmin = -4;
    xmax = 20;
    double x[80];
    double y[80];
    double dx = (xmax - xmin) / (n);

    for(int i = 0; i < 80; i++)
    {
       double xi = xmin + i*dx;
       double yi = 5*(xi*xi) - 3*xi + 10;

       x[i] = xi;
       y[i] = yi;
    }

 //-
    double ymin = y[0],ymax = y[0];
    int Dx = 50,Dy= 80,Px =500,Py = 400;
    for (int i=1;i<80;i++)
    {
        if (ymin > y[i]) ymin = y[i];
        if (ymax < y[i]) ymax = y[i];
    }
    double Sx = (xmax - xmin) / Px, Sy = (ymax - ymin) / Py;
    int I = Px/Dx,G = Py/Dy;

    initwindow(800,600);
    line (200,450,200+Px,450);
    line (200,450,200,450-Py);
    moveto (200,450);
    for (int i=0;i<=I;i++)
    {
        line (200+i*Dx,450,200+i*Dx,450+3);
    }
    for (int i=0;i<=G;i++)
    {
        line (200,450-i*Dy,200-3,450-i*Dy);
    }
    for (int i=0;i<80;i++)
    {
        lineto(200+((x[i]-xmin)/Sx),450-((y[i]-ymin)/Sy));
    }
    getch();

    return 0;
}