自己编了个计算器，可以运算乘法和求园的面积。然后编译时报错。请问要怎么办？
源码：

#include "stdafx.h"
#include <windows.h>
#include <windowsx.h>
#include "resource.h"
#include "MainDlg.h"
#include <stdio.h>
#include <stdlib.h> 

BOOL WINAPI Main_Proc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch(uMsg)
    {
        HANDLE_MSG(hWnd, WM_INITDIALOG, Main_OnInitDialog);
        HANDLE_MSG(hWnd, WM_COMMAND, Main_OnCommand);
        HANDLE_MSG(hWnd,WM_CLOSE, Main_OnClose);
    }

    return FALSE;
}

BOOL Main_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam)
{
    return TRUE;
}

void Main_OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify)
{
    switch(id)
    {
        case IDC_OK:
        TCHAR str1[256];
        TCHAR str2[256];
        GetDlgItemText(hwnd,IDC_EDIT1,str1,sizeof(str1));
        GetDlgItemText(hwnd,IDC_EDIT2,str2,sizeof(str2));
        int i1=atoi(str1);
        int i2=atoi(str2);
        int i4=i1*i2;
        TCHAR str4[256];
        wsprintf(str4,"%i",i4);
        SetDlgItemText(hwnd,IDC_EDIT3,str4);
        break;
    }

        case IDC_OK2:
        TCHAR str3[256];
        GetDlgItemText(hwnd,IDC_EDIT4,str3,sizeof(str3));
        int i3=atoi(str3);
        int i5=i3*i3*3.14;
        wsprintf(str3,"%i",i5);
        SetDlgItemText(hwnd,IDC_EDIT4,str3);
}

void Main_OnClose(HWND hwnd)
{
    EndDialog(hwnd, 0);
}

报错信息：
C:\Program Files\Microsoft Visual Studio\MyProjects\练习\MainDlg.cpp(44) : error C2046: illegal case
C:\Program Files\Microsoft Visual Studio\MyProjects\练习\MainDlg.cpp(48) : warning C4244: 'initializing' : conversion from 'double' to 'int', possible loss of data
执行 cl.exe 时出错.

请问要怎么办？

恩。怎么了？

#include "stdafx.h"
#include <windows.h>
#include <windowsx.h>
#include "resource.h"
#include "MainDlg.h"
#include <stdio.h>
#include <stdlib.h> 

BOOL WINAPI Main_Proc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch(uMsg)
    {
        HANDLE_MSG(hWnd, WM_INITDIALOG, Main_OnInitDialog);
        HANDLE_MSG(hWnd, WM_COMMAND, Main_OnCommand);
        HANDLE_MSG(hWnd,WM_CLOSE, Main_OnClose);
    }

    return FALSE;
}

BOOL Main_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam)
{
    return TRUE;
}

void Main_OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify)
{
    switch(id)
    {
        case IDC_OK:
        TCHAR str1[256];
        TCHAR str2[256];
        GetDlgItemText(hwnd,IDC_EDIT1,str1,sizeof(str1));
        GetDlgItemText(hwnd,IDC_EDIT2,str2,sizeof(str2));
        int i1=atoi(str1);
        int i2=atoi(str2);
        int i4=i1*i2;
        TCHAR str4[256];
        wsprintf(str4,"%i",i4);
        SetDlgItemText(hwnd,IDC_EDIT3,str4);
    }
        switch(id) //加上switch语句就可以运行
    {
        case IDC_OK2:
        TCHAR str3[256];
        GetDlgItemText(hwnd,IDC_EDIT4,str3,sizeof(str3));
        int i3=atoi(str3);
        int i5=(int)(i3*i3*3.14); //输出的是整数怎么办？
        wsprintf(str3,"%i",i5);
        SetDlgItemText(hwnd,IDC_EDIT5,str3);
        break;
    }
}

void Main_OnClose(HWND hwnd)
{
    EndDialog(hwnd, 0);
}

这样就可以编译通过了...............

但是求面积那步，在IDC_EDIT5输出(i3*i3*3.14)的结果怎么没有小数点？

[ 本帖最后由 surongre 于 2011-2-27 17:32 编辑 ]