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);
            float i3;

            HWND hwndCOMBO1=GetDlgItem(hwnd,IDC_COMBO1);
            int CURE=ComboBox_GetCurSel(hwndCOMBO1) ;
            
            switch(CURE)
            {
            case 0:
                {
                    i3=i1+i2;
                }
                break;
            case 1:
                {
                    i3=i1-i2;
                }
                break;
            case 2:
                {
                    i3=i1*i2;
                }
                break;
            case 3:
                {
                    i3=(float)i1/i2;
                }
                break;
            }

            TCHAR str3[256];
            sprintf(str3,"%f",i3);
            SetDlgItemText(hwnd,IDC_EDIT3,str3);


        }

  想写个简单的计算器，上面的是程序的一部分，在case 3中，也就是使用除法运算，为了使其值精确，所以将I3设为float型，在最后输出结果时也用了%f型，结果无论哪种运算，都会保留7位小数，感觉这个好烦..我只想保留两位小数，请问哪位高手能告诉下怎么改...

恩，知道了，一直用%3f，才发现少了个点，真是傻死...  谢谢楼上的朋友~