Vinapi c++, the essence of the program is that the computer guesses the user's number. Need code improvement

Нужно написать событие, при котором если пользователь лжет компьютеру и всегда нажимает "нет" или "да", то мы видим, что компьютер пишет, к примеру,"Вы обманываете":

#include <windows.h>
#include <tchar.h>
#define APPNAME _T("LabWork1")
#define APPCLS _T("Nuklon")
#define IDC_SMALL 100
#define IDC_BIG 101
#define IDC_ANSWER 102
#define _creatButton(name, id, x, y) \
CreateWindow(_T("BUTTON"), name, WS_CHILD | BS_USERBUTTON | WS_VISIBLE,\
x, y, 200, 60, hwnd, (HMENU)id, (HINSTANCE)lParam, NULL)
//////////////////////////////////////////////////////////
LRESULT CALLBACK _wndProc(HWND, UINT, WPARAM, LPARAM);
int _creatWindow(HINSTANCE, const TCHAR*);
void _helloDlg(HWND, int, int);
void _answerCPU(HWND, int, int, char);
/// /////////////////////////////////////////////////////
int f_n = 1;
int l_n = 1000;
//////////////////////////////////////////////////////////
int WINAPI _tWinMain(HINSTANCE hInstance, HINSTANCE, LPTSTR, int) { return _creatWindow(hInstance, _T("LabWork1. Less or more?"));}
///////////////////////ОКНО//////////////////////
int _creatWindow(HINSTANCE hInst, const TCHAR* caption) {
HWND hwnd = NULL;
MSG msg = { 0 };
WNDCLASS ofs = {
0, _wndProc, 0, 0, hInst, 0, LoadCursor(NULL, IDC_ARROW),
(HBRUSH)(COLOR_WINDOW + 2), 0, APPCLS };
if (!RegisterClass(&ofs))
return 1;
hwnd = CreateWindow(APPCLS, caption, WS_OVERLAPPEDWINDOW & ~WS_SIZEBOX,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, HWND_DESKTOP,
NULL, hInst, hInst);
if (hwnd == NULL) {
UnregisterClass(APPCLS, hInst);
return 1;}
ShowWindow(hwnd, SW_SHOW);
UpdateWindow(hwnd);
while (GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);}
return 0;}
////////////////////////////////////////////////////////
LRESULT CALLBACK _wndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
static HWND bbig = NULL;
static HWND bsmall = NULL;
RECT rc;
switch (msg) {
case WM_CREATE:
GetClientRect(hwnd, &rc);
bsmall = _creatButton(_T("МЕНЬШЕ"), IDC_SMALL, rc.right / 10 + 350, rc.bottom / 2 + 30);
bbig = _creatButton(_T("БОЛЬШЕ"), IDC_BIG, rc.right / 10 + 350, rc.bottom / 2 - 40);
SendMessage(hwnd, WM_COMMAND, MAKEWPARAM(IDC_ANSWER, 0), 0);
break;
case WM_COMMAND:
switch (LOWORD(wParam)) {
case IDC_SMALL:
_answerCPU(hwnd, f_n, l_n, '<');
break;
case IDC_BIG:
_answerCPU(hwnd, f_n, l_n, '>');
break;
case IDC_ANSWER:
_helloDlg(hwnd, f_n, l_n);
_answerCPU(hwnd, f_n, l_n, 0);
break;
}
break;
case WM_DESTROY:
DestroyWindow(bsmall);
DestroyWindow(bbig);
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);}
return 0;}
////////////////////НАЧАЛО/////////////////////////////////
void _helloDlg(HWND hwnd, int f, int l) {
TCHAR buf[64];
wsprintf(buf, _T("Для начала игры задумайте число от %d до %d"), f, l);
MessageBox(hwnd, buf, APPNAME, MB_OK | MB_ICONINFORMATION);
}
///////////////////////////////////////////////////////
void _answerCPU(HWND hwnd, int _f, int _l, char ch) {
static int f = _f;
static int l = _l;
static int num = 0;
TCHAR buf[64];
int id;

switch (ch) {
case '<': // МЕНЬШЕ
l = num;
break;
case '>': // БОЛЬШЕ
f = num + 1;
break;
}
num = (f + l) / 2;

wsprintf(buf, _T("Загаданным числом является %d. Да/Нет?"), num);
id = MessageBox(hwnd, buf, APPNAME, MB_YESNO | MB_ICONQUESTION);
if (id != IDYES)
return;


wsprintf(buf, _T("Получилось! Ваше число %d"), num);

id = MessageBox(hwnd, buf, APPNAME, MB_OKCANCEL | MB_ICONINFORMATION);
if (id == IDCANCEL)
SendMessage(hwnd, WM_DESTROY, 0, 0);
else {
f = _f;
l = _l;
SendMessage(hwnd, WM_COMMAND, MAKEWPARAM(IDC_ANSWER, 0), 0);
}
}