INT_PTR CALLBACK MathTest(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    int random1 = 0;
    int random2 = 0;
    int random3 = 0;
   // string a = "";
    int a = GetDlgItemInt(hDlg, IDC_A, NULL, true);
    int b = GetDlgItemInt(hDlg, IDC_B, NULL, true);
    int c = GetDlgItemInt(hDlg, IDC_C, NULL, true);
    int Correct = GetDlgItemInt(hDlg, IDC_CORRECT, NULL, true);
    int Wrong = GetDlgItemInt(hDlg, IDC_WRONG, NULL, true);
    char MathSymbol{};
    char Txt[20];
    UNREFERENCED_PARAMETER(lParam);
    switch (message)
    {
    case WM_INITDIALOG:
        CheckDlgButton(hDlg, IDC_PLUS, BST_CHECKED);

        CheckDlgButton(hDlg, IDC_1_20, BST_CHECKED);

        srand(time(0));
        return (INT_PTR)TRUE;

    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
        {
            EndDialog(hDlg, LOWORD(wParam));
            return (INT_PTR)TRUE;
        }
        else if (LOWORD(wParam) == IDC_PLUS) {
            if (IsDlgButtonChecked(hDlg, IDC_1_20)) {
            int a = GetDlgItemInt(hDlg, IDC_A, NULL, true);
            int b = GetDlgItemInt(hDlg, IDC_B, NULL, true);
            int c = GetDlgItemInt(hDlg, IDC_C, NULL, true);
            SetDlgItemInt(hDlg, IDC_LIST, a + b + c,true);
        }
        }
        else if (LOWORD(wParam) == IDC_RANDOM) {
            srand(time(NULL));
            if (IsDlgButtonChecked(hDlg, IDC_1_20)) {
                 random1 = rand() % (20 + 1 - 0) + 0;
                 SetDlgItemInt(hDlg, IDC_A, random1, true);
                random2 = rand() % (20 + 1 - 0) + 0;
                SetDlgItemInt(hDlg, IDC_B, random2, true);
                random3 = rand() % (20 + 1 - 0) + 0;
                SetDlgItemInt(hDlg, IDC_C, random3, true);
                // int a = GetDlgItemInt(hDlg, IDC_A, NULL, true);
               //int b = GetDlgItemInt(hDlg, IDC_B, NULL, true);
            //  int c = GetDlgItemInt(hDlg, IDC_C, NULL, true);
            }else if (IsDlgButtonChecked(hDlg, IDC_21_50)) {
                random1 = rand() % (50 + 1 - 21) + 21;
                SetDlgItemInt(hDlg, IDC_A, random1, true);
                random2 = rand() % (50 + 1 - 21) + 21;
                SetDlgItemInt(hDlg, IDC_B, random2, true);
                random3 = rand() % (50 + 1 - 21) + 21;
                SetDlgItemInt(hDlg, IDC_C, random3, true);
            }
            else if (IsDlgButtonChecked(hDlg, IDC_51_100)) {
                random1 = rand() % (100 + 1 - 51) + 51;
                SetDlgItemInt(hDlg, IDC_A, random1, true);
                random2 = rand() % (100 + 1 - 51) + 51;
                SetDlgItemInt(hDlg, IDC_B, random2, true);
                random3 = rand() % (100 + 1 - 51) + 51;
                SetDlgItemInt(hDlg, IDC_C, random3, true);
            }
            break;
        }
        else if (LOWORD(wParam) == IDC_FINISH) {


            a = (double)Correct / (Correct + Wrong) * 100;

            b = (double)Correct / (Correct + Wrong) * 100;
            c = (double)Correct / (Correct + Wrong) * 100;

           /*
            if(IsDlgButtonChecked(hDlg, IDC_PLUS) == true){

            }
            else if (IsDlgButtonChecked(hDlg, IDC_MINUS) == true) {

            }
            else if (IsDlgButtonChecked(hDlg, IDC_UMNOJ) == true) {

            }
            else if (IsDlgButtonChecked(hDlg, IDC_DEL) == true) {

            }


            GetDlgItemText(hDlg, IDC_A,(LPWSTR)aTxt, 20);
            SendDlgItemMessage(hDlg, IDC_LIST, LB_ADDSTRING, 0, (LPARAM)aTxt);


            if (IsDlgButtonChecked(hDlg, IDC_PLUS) == true) {
                MathSymbol = '+';
            }else if (IsDlgButtonChecked(hDlg, IDC_MINUS) == true) {
                MathSymbol = '-';
            }else  if (IsDlgButtonChecked(hDlg, IDC_UMNOJ) == true) {
                MathSymbol = '*';
            }else  if (IsDlgButtonChecked(hDlg, IDC_DEL) == true) {
                MathSymbol = '/';
            }

            char bTxt[20];
            GetDlgItemText(hDlg, IDC_B, (LPWSTR)bTxt, 20);
            SendDlgItemMessage(hDlg, IDC_LIST, LB_ADDSTRING, 0, (LPARAM)bTxt);

            if (IsDlgButtonChecked(hDlg, IDC_PLUS) == true) {
                MathSymbol = '+';
            }
            else if (IsDlgButtonChecked(hDlg, IDC_MINUS) == true) {
                MathSymbol = '-';
            }
            else  if (IsDlgButtonChecked(hDlg, IDC_UMNOJ) == true) {
                MathSymbol = '*';
            }
            else  if (IsDlgButtonChecked(hDlg, IDC_DEL) == true) {
                MathSymbol = '/';
            }

            char cTxt[20];
            GetDlgItemText(hDlg, IDC_C, (LPWSTR)cTxt, 20);
            SendDlgItemMessage(hDlg, IDC_LIST, LB_ADDSTRING, 0, (LPARAM)cTxt);


            if (IsDlgButtonChecked(hDlg, IDC_PLUS) == true) {
                MathSymbol = '+';
            }
            else if (IsDlgButtonChecked(hDlg, IDC_MINUS) == true) {
                MathSymbol = '-';
            }
            else  if (IsDlgButtonChecked(hDlg, IDC_UMNOJ) == true) {
                MathSymbol = '*';
            }
            else  if (IsDlgButtonChecked(hDlg, IDC_DEL) == true) {
                MathSymbol = '/';
            }*/
        }
        else if (LOWORD(wParam) == IDC_CLEAR) {
        SetDlgItemText(hDlg, IDC_A, 0);
        SetDlgItemText(hDlg, IDC_B, 0);
        SetDlgItemText(hDlg, IDC_C, 0);
        break;
        }
        else if (LOWORD(wParam) == IDC_CHECK) {
        int a = GetDlgItemInt(hDlg, IDC_A, NULL, true);
        int b = GetDlgItemInt(hDlg, IDC_B, NULL, true);
        int c = GetDlgItemInt(hDlg, IDC_C, NULL, true);
        if ((a + b) == c || (a - b) == c || (a * b) == c || (a / b) == c) {
            Correct++;
            SetDlgItemInt(hDlg, IDC_CORRECT, Correct, true);
        }
        else {
            Wrong++;
            SetDlgItemInt(hDlg, IDC_WRONG,Wrong, true);
        }
        if (IsDlgButtonChecked(hDlg, IDC_PLUS) == true) {
            MathSymbol = '+';
        }
        else if (IsDlgButtonChecked(hDlg, IDC_MINUS) == true) {
            MathSymbol = '-';
        }
        else  if (IsDlgButtonChecked(hDlg, IDC_UMNOJ) == true) {
            MathSymbol = '*';
        }
        else  if (IsDlgButtonChecked(hDlg, IDC_DEL) == true) {
            MathSymbol = '/';
        }
       string Txt = to_string(a) + MathSymbol + to_string(b) + '=' + to_string(c);

        }

        break;
    }
    return (INT_PTR)FALSE;
}