Listingul programului:#include <windows.h>#include <cmath>

const double pi = 3.1415926535;

// Function prototypes:double w(double x);int g(int x);

double f(double x);

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR szCmdLine, INT iCmdShow){

LPCWSTR szAppName = L"WinApp";LPCWSTR szWndName = L"Afisarea unui sistem de coordonate cartezian cu 3

functii";

HWND hWnd;MSG msg;WNDCLASS wndclass;

wndclass.style = CS_HREDRAW | CS_VREDRAW;wndclass.lpfnWndProc = WndProc;wndclass.cbClsExtra = 0;wndclass.cbWndExtra = 0;wndclass.hInstance = hInstance;wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);wndclass.lpszMenuName = NULL;wndclass.lpszClassName = szAppName;

if (!RegisterClass(&wndclass)){

MessageBox(NULL, L"Could not create window.", L"Error", 0);return 0;

}

hWnd = CreateWindow(szAppName, szWndName, WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, CW_USEDEFAULT, 1366, 768, NULL, NULL, hInstance,

NULL);

ShowWindow(hWnd, iCmdShow);UpdateWindow(hWnd);

while (GetMessage(&msg, NULL, 0, 0)){

TranslateMessage(&msg);DispatchMessage(&msg);

}

return (int)msg.wParam;

}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){

double x;

switch (message){case WM_CREATE:

return 0;

case WM_PAINT:HDC hDC;PAINTSTRUCT ps;HPEN hOldPen, hNewPen;

hDC = BeginPaint(hWnd, &ps);hNewPen = CreatePen(PS_SOLID, 1, RGB(0, 180, 180)); // aqua color hOldPen = (HPEN)SelectObject(hDC, hNewPen);

// Print a message:TextOut(hDC, 50, 50, L"Verde- g=2*cos(x)", 17);TextOut(hDC, 50, 80, L"Rosu- f=ctg(k*x)", 20);TextOut(hDC, 50, 110, L"Violet- w=arcctg(k*x)", 22);

// Draw the axes:MoveToEx(hDC, 100, 384, NULL);LineTo(hDC, 1266, 384);MoveToEx(hDC, 668, 100, NULL);LineTo(hDC, 668, 668);

MoveToEx(hDC, 568, 374, NULL);LineTo(hDC, 568, 394);TextOut(hDC, 550, 395, L"-3.14/2", 7);

MoveToEx(hDC, 768, 374, NULL);LineTo(hDC, 768, 394);TextOut(hDC, 755, 395, L"3.14/2", 7);MoveToEx(hDC, 368, 374, NULL);LineTo(hDC, 368, 394);TextOut(hDC, 350, 395, L"-6.28/4", 7);MoveToEx(hDC, 168, 374, NULL);LineTo(hDC, 168, 394);TextOut(hDC, 155, 395, L"-12.46/8", 11);

MoveToEx(hDC, 968, 374, NULL);LineTo(hDC, 968, 394);TextOut(hDC, 955, 395, L"12.46/8", 7);MoveToEx(hDC, 1168, 374, NULL);LineTo(hDC, 1168, 394);TextOut(hDC, 1155, 395, L"6.28/4", 7);MoveToEx(hDC, 658, 284, NULL);LineTo(hDC, 678, 284);TextOut(hDC, 638, 277, L"1", 1);MoveToEx(hDC, 658, 484, NULL);

LineTo(hDC, 678, 484);TextOut(hDC, 638, 477, L"-1", 2);

// Draw the graph of the function g:for (x = -550; x <= 575; x++)

SetPixel(hDC, 668 + x, 384 + g(x), RGB(26,145,15)); // verde

// Draw th graph of the function f, the one that modulates the amplitude of g:

for (x = -550; x <= 575;){

SetPixel(hDC, 668 + x, 384 + f(x), RGB(227, 18, 219)); // 227,18,219bordo

x += 0.0025;}//*** Students: this is the end of the section that you might try to

change. ***for (x = -550; x <= 575;){

SetPixel(hDC, 668 + x, 384 + w(x), RGB(28, 237, 36)); // albastru

x += 0.0025;}

//*** Students: this is the end of the section that you might try to change. ***

EndPaint(hWnd, &ps);return 0;

case WM_DESTROY:PostQuitMessage(0);return 0;

}

return DefWindowProc(hWnd, message, wParam, lParam);}

/* Given: x An integer value.Task: To compute the nearest integer to the value of g at x where g is a modified sine function.Return: In the function name we return this integer approximation to the value of g at x.*/double w(double x){

return 1 / (atan(0.1*pi * x/200.0 ));}

/* Given: x An integer value.Task: To compute the nearest integer to the value of f at x where f is a modified sine function.

Return: In the function name we return this integer approximation to the value of f at x.*/int g(int x){

return 100 * cos(pi * x / 200.0);}double f(double x){

return cos(0.1*pi * x / 20.0) / sin(0.1*pi * x / 20.0);}

Rezultatul rularii programului: