代码生成VC简单计算器

以下是用VC++实现简单计算器的代码：

#include "stdafx.h"
#include "resource.h"

#define MAX_COUNT 128

double result;
double num1, num2;
char op;

BOOL CALLBACK Dlg_Proc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    char str[MAX_COUNT];

    switch(uMsg)
    {
    case WM_INITDIALOG:
        SetDlgItemText(hwndDlg, IDC_EDIT1, "");
        SetDlgItemText(hwndDlg, IDC_EDIT2, "");
        SetDlgItemText(hwndDlg, IDC_EDIT3, "");
        break;

    case WM_COMMAND:
        switch(wParam)
        {
        case IDC_BUTTON1:   // 数字1
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            strcat(str, "1");
            SetDlgItemText(hwndDlg, IDC_EDIT1, str);
            break;

        case IDC_BUTTON2:   // 数字2
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            strcat(str, "2");
            SetDlgItemText(hwndDlg, IDC_EDIT1, str);
            break;

        case IDC_BUTTON3:   // 数字3
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            strcat(str, "3");
            SetDlgItemText(hwndDlg, IDC_EDIT1, str);
            break;

        case IDC_BUTTON4:   // 数字4
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            strcat(str, "4");
            SetDlgItemText(hwndDlg, IDC_EDIT1, str);
            break;

        case IDC_BUTTON5:   // 数字5
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            strcat(str, "5");
            SetDlgItemText(hwndDlg, IDC_EDIT1, str);
            break;

        case IDC_BUTTON6:   // 数字6
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            strcat(str, "6");
            SetDlgItemText(hwndDlg, IDC_EDIT1, str);
            break;

        case IDC_BUTTON7:   // 数字7
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            strcat(str, "7");
            SetDlgItemText(hwndDlg, IDC_EDIT1, str);
            break;

        case IDC_BUTTON8:   // 数字8
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            strcat(str, "8");
            SetDlgItemText(hwndDlg, IDC_EDIT1, str);
            break;

        case IDC_BUTTON9:   // 数字9
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            strcat(str, "9");
            SetDlgItemText(hwndDlg, IDC_EDIT1, str);
            break;

        case IDC_BUTTON0:   // 数字0
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            strcat(str, "0");
            SetDlgItemText(hwndDlg, IDC_EDIT1, str);
            break;

        case IDC_BUTTON_POINT:  // 小数点
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            if (strchr(str, '.') == NULL)
                strcat(str, ".");
            SetDlgItemText(hwndDlg, IDC_EDIT1, str);
            break;

        case IDC_BUTTON_ADD:    // 加号
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            num1 = atof(str);
            op = '+';
            SetDlgItemText(hwndDlg, IDC_EDIT1, "");
            break;

        case IDC_BUTTON_SUB:    // 减号
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            num1 = atof(str);
            op = '-';
            SetDlgItemText(hwndDlg, IDC_EDIT1, "");
            break;

        case IDC_BUTTON_MUL:    // 乘号
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            num1 = atof(str);
            op = '*';
            SetDlgItemText(hwndDlg, IDC_EDIT1, "");
            break;

        case IDC_BUTTON_DIV:    // 除号
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            num1 = atof(str);
            op = '/';
            SetDlgItemText(hwndDlg, IDC_EDIT1, "");
            break;

        case IDC_BUTTON_EQUAL:  // 等号
            GetDlgItemText(hwndDlg, IDC_EDIT1, str, MAX_COUNT);
            num2 = atof(str);
            switch(op)
            {
            case '+':
                result = num1 + num2;
                break;

            case '-':
                result = num1 - num2;
                break;

            case '*':
                result = num1 * num2;
                break;

            case '/':
                if (num2 == 0)
                {
                    MessageBox(hwndDlg, "除数不能为0！", "错误", MB_OK | MB_ICONERROR);
                    SetDlgItemText(hwndDlg, IDC_EDIT1, "");
                    return TRUE;
                }
                else
                    result = num1 / num2;
                break;
            }
            sprintf(str, "%.2f", result);
            SetDlgItemText(hwndDlg, IDC_EDIT3, str);
            break;

        case IDC_BUTTON_CLEAR:  // 清除
            SetDlgItemText(hwndDlg, IDC_EDIT1, "");
            SetDlgItemText(hwndDlg, IDC_EDIT3, "");
            break;

        case IDCANCEL:  // 取消
            EndDialog(hwndDlg, wParam);
            return TRUE;
        }
        break;
    }

    return FALSE;
}

int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    LPTSTR lpCmdLine, int nCmdShow)
{
    DialogBox(hInstance, MAKEINTRESOURCE(IDD_DIALOG1), NULL, Dlg_Proc);
    return 0;
}

这个程序基于对话框，包含一个编辑框和一些按钮，按下按钮之后，将数字或运算符添加到编辑框中。当用户点击“等于”按钮时，程序将计算出结果并将其显示在另一个编辑框中。