Вычисление области, ограниченной графиками функции

#include "stdafx.h"
#include <Windows.h>
#include <iostream>
#define graphic(x) (pow((2*x),2))
#define graphic1(x) (2)
using namespace std;
void func()
{
    float x;
    HDC hDC = GetDC(GetConsoleWindow());
    HPEN Pen = CreatePen(PS_SOLID, 2, RGB(255, 255, 255));
    SelectObject(hDC, Pen);
    MoveToEx(hDC, 330, 115, NULL);
    LineTo(hDC, 530, 115);
    MoveToEx(hDC, 430, 30, NULL);
 
    LineTo(hDC, 430, 200);
    for (x = -8.0f; x <= 8.0f; x += 0.01f) 
    {
        MoveToEx(hDC, 10 * x + 430, -10 * graphic(x) + 115, NULL);
        LineTo(hDC, 10 * x + 430, -10 * graphic(x) + 115);
    }
    for (x = -8.0f; x <= 8.0f; x += 0.01f)
    {
        MoveToEx(hDC, 10 * x + 430, -10 * graphic1(x) + 115, NULL);
        LineTo(hDC, 10 * x + 430, -10 * graphic1(x) + 115);
    }
}
 
void table()
{
    float x, x1 = -8, x2 = 8, dx = 1, f = 0, y1, y2; 
    cout << "\t|   x   |   y1  |   y2   |\n";
    cout << "\t=========================\n";
    for (x = x1; x < x2; x += dx)
    {
        y1 = graphic(x); y2 = graphic1(x);
        cout << "\t|" << x << "\t|" << y1 << "\t|" << y2 << "\t|" << endl;
    }
    cout << "\t=========================\n";
}
int main()
{
    SetConsoleCP(1251);
    SetConsoleOutputCP(1251);
         table();
          func();
system("pause");