vc API 计算器

最新推荐文章于 2024-04-22 19:10:53 发布

原创最新推荐文章于 2024-04-22 19:10:53 发布 · 767 阅读

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CC 4.0 BY-SA版权

文章标签：

#api #winapi #null #command #qq #c

篇幅有限，这里只列出了部分代码，去掉了重复部分，如果想要完整的代码，请参考

csdn：http://download.youkuaiyun.com/source/3448966 资源。

作者：林子木

水平有限，以下代码，仅供参考，个人QQ：356342556 如想交流，验证信息：林子木

#include "stdafx.h"
#include <windows.h>
#include <windowsx.h>
#include "Resource.h"
#include "MainDlg.h"
#include"math.h"

double flag = 0;
int flag_sign = 0; //当前按下的运算符号
double N = 10;
double n = 0;  //保存输入的值
double result = 0; //算式结果
int key = 0;   //保存前一个运算符号
TCHAR num[256]; //保存计算的值
TCHAR snum[256]; //保存计算的式子
TCHAR pnum[256]; //中间变量

void dtostr(TCHAR srt[],double n);//double 至 str
void Main_Equal (HWND hwnd); //显示函数

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_0:// num 0
  {
   if(flag_sign == 0) //如果是第一数，那么就在下一行
   {
   wsprintf(num,"%s%s",num,"0");//将按一个0，就以字符串的形式，添加一个0进去
   wsprintf(pnum,"\r\n%s",num); // 注意此处如果想换行，必须Edit control 开启换行功能而且\r\n 才能换行
   SetDlgItemText(hwnd,IDC_DISPLAY, pnum);//将pnum 显示在 IDC_DISPLAY 框中
   }
   else     //不是第一个数，将前面的算式也打印出来
   {

   wsprintf(num,"%s%s",num,"0");
   wsprintf(pnum,"%s\r\n%s",snum,num); //将前面的算式式子也显示
   SetDlgItemText(hwnd,IDC_DISPLAY, pnum);
   }

  }
        break;

case IDC_POINT: //point
  {
    n =strtod(num,NULL);
   if(n == 0)    //如果前面的n是零的情况
   {
   wsprintf(num,"%s","0.");
   wsprintf(pnum,"%s\r\n%s",snum,num);
   SetDlgItemText(hwnd,IDC_DISPLAY, pnum);
   }
   else
   {

   wsprintf(num,"%s%s",num,"."); //n为非零的情况
   wsprintf(pnum,"%s\r\n%s",snum,num);
   SetDlgItemText(hwnd,IDC_DISPLAY, pnum);
   }

  }
        break;
    case IDC_CE:        //清除所有
  {
   n = 0;
   wsprintf(num,"%s","\0");
   wsprintf(snum,"%s","\0");
   wsprintf(pnum,"%s","\0");
   flag = 0;
   flag_sign = 0;
   result = 0;
   SetDlgItemText(hwnd,IDC_DISPLAY, num);

  }
        break;
    case IDC_C:                              //清除所有
  {
   n = 0;
   wsprintf(num,"%s","\0");
   wsprintf(snum,"%s","\0");
   wsprintf(pnum,"%s","\0");
   flag = 0;
   flag_sign = 0;
   result = 0;
   SetDlgItemText(hwnd,IDC_DISPLAY, num);

  }
        break;
    case IDC_BACKSPACE: //退位标志
  {
    n =strtod(num,NULL);
    n=(int)(n/10);
    if(n==0)
    wsprintf(num,"%s","\0");
    else
   dtostr(num,n);
   wsprintf(pnum,"%s\r\n%s",snum,num);
   SetDlgItemText(hwnd,IDC_DISPLAY,pnum);
  }
        break;
    case IDC_JIA:// add 加法函数
  {
   wsprintf(snum,"%s%s +",snum,num); //在输入值后带上加法
   SetDlgItemText(hwnd,IDC_DISPLAY, snum); //打印
   n = strtod(num,NULL);                          // 将如入的值转换为 double型保存在 n中
   wsprintf(num,"%s","\0");      //将 num 清零
   flag_sign = 1;          //flag_sign 加法为1 减法为 2 乘法为3 除法为4
   Main_Equal (hwnd);        //调用显示函数

  }
        break;

case IDC_EQUAL:         //等号
  {
   wsprintf(snum,"%s%s",snum,num);
   SetDlgItemText(hwnd,IDC_DISPLAY, snum);
   n = strtod(num,NULL);
   wsprintf(num,"%s","\0");
   flag_sign = 0;
   Main_Equal (hwnd);
   n = 0;
   wsprintf(num,"%s","\0");
   wsprintf(snum,"%s","\0");
   wsprintf(pnum,"%s","\0");
   flag = 0;
   flag_sign = 0;
   MessageBox(hwnd,TEXT("算式到此已经没有了，像=后在加减乘除没有编辑"),TEXT("温馨提示"),MB_OK);
  }
  break;
    case IDC_GENHAO:
  {
   MessageBox(hwnd,TEXT("根号，%，倒数，符号未定义"),TEXT("温馨提示"),MB_OK);
  }
  break;
    case IDC_BAIFENHAO:
  {
   MessageBox(hwnd,TEXT("根号，%，倒数，符号未定义"),TEXT("温馨提示"),MB_OK);
  }
  break;
    case IDC_DAOSHU:
  {
   MessageBox(hwnd,TEXT("根号，%，倒数，符号未定义"),TEXT("温馨提示"),MB_OK);
  }
  break;
    case IDC_NEGTIVE:
  {
   MessageBox(hwnd,TEXT("根号，%，倒数，符号未定义"),TEXT("温馨提示"),MB_OK);
  }
  break;
        default:
  break;
    }
}

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

void Main_Equal (HWND hwnd)
{
switch (key)
    {
        case 0: //等号显示
       {
        result = n;
        n = 0;
        dtostr(num,result);
        wsprintf(pnum,"%s\r\n%s",snum,num);
        SetDlgItemText(hwnd,IDC_DISPLAY,pnum);
        wsprintf(num,"%s ","\0");
        key = flag_sign ;

       }
       break;

        case 1:    //加法显示
       {

        result += n;
        n = 0;
        dtostr(num,result); //将结果转化为字符串
        wsprintf(pnum,"%s\r\n%s",snum,num); //将snum 和 num 保存在 pnum中
        SetDlgItemText(hwnd,IDC_DISPLAY,pnum); //打印pnum
        wsprintf(num,"%s ","\0");       //清零 num
        key = flag_sign ;          //更新操作现在的操作是前一个运算符当前按下的 + 将在下一次按下运算符号或者 = 时执行

       }
       break;

default:
         break;
    }

}

void dtostr(TCHAR srt[],double n1) //double 至 str
{
int Num; //整数部分
int Point; //小数部分
char a1[256];
char a2[256];
Num = (int)n1;
Point = (int)((n1-Num+0.0000001)*pow(10.0,6)); //这里到小数点后面六位 +0.0000001 是因为 strtod 函数转化精度的问题
while(Point % 10==0&&Point>0)
{
Point /= 10; //将小数中后面的零去掉
}
itoa(Num,a1,10);
itoa(Point,a2,10);
if(Point>0)
wsprintf(srt,"%s%s%s",a1,".",a2); //打印
else
wsprintf(srt,"%s",a1);
}