C++面向?qū)ο蟪绦蛟O(shè)計(jì)簡單計(jì)算器的設(shè)計(jì)

1、 面向?qū)ο蟪绦蛟O(shè)計(jì) -簡單計(jì)算器的設(shè)計(jì)一、問題描述簡單計(jì)算器的基本功能如下：1. 四則運(yùn)算，例如加減乘除等；2. 除了整數(shù)的運(yùn)算也可實(shí)現(xiàn)小數(shù)的各類運(yùn)算；3. 判斷非法操作，例如判定1/0為非法操作；4. 其他特性；這個(gè)簡易計(jì)算器只實(shí)現(xiàn)以上所述功能，即實(shí)現(xiàn)簡單計(jì)算。二、設(shè)計(jì)思路計(jì)算器起始運(yùn)行在歸零狀態(tài)，此時(shí)只接受數(shù)字輸入，當(dāng)按下一個(gè)數(shù)字按鈕時(shí)，計(jì)算器只顯示用戶輸入第一個(gè)操作數(shù)，用戶在該狀態(tài)下可以繼續(xù)輸入數(shù)字。1當(dāng)?shù)谝粋€(gè)數(shù)字輸入完成后，可以接受第二個(gè)操作數(shù)。2在數(shù)字輸入結(jié)束進(jìn)行運(yùn)算后，按下=按鈕可以根據(jù)前面按下的操作符計(jì)算結(jié)果顯示，表示計(jì)算完成。3在上述計(jì)算過程中都可以接受雙擊等號(hào)回到清零狀態(tài)。三

2、、功能函數(shù)設(shè)計(jì)：1數(shù)字按鈕這個(gè)是通過最基本的onbutton()將09十個(gè)數(shù)字按鈕的單擊消息處理函數(shù)用類向?qū)筷P(guān)聯(lián)到此，適文本框應(yīng)該只是顯示當(dāng)前單擊的數(shù)字；2小數(shù)點(diǎn)按鈕函數(shù)ondecimal這個(gè)函數(shù)主要是實(shí)現(xiàn)小數(shù)點(diǎn)在計(jì)算器的相關(guān)功能3列表在算法的函數(shù)onselchangeoperatorlist()這一類按鈕包括“+”“-”“*”“/”，它們的單擊消息在同一個(gè)處理函數(shù)中進(jìn)行處理，以同樣的方法把這四個(gè)按鈕的單擊操作關(guān)聯(lián)到此函數(shù)中，使四則運(yùn)算法則在列表中通過選擇去實(shí)現(xiàn)。4“=”符號(hào)函數(shù)onenquall()實(shí)現(xiàn)計(jì)算器中等號(hào)的功能，雙擊時(shí)也可使編輯框的數(shù)字歸零。四、編碼實(shí)現(xiàn)：int calcula

3、tor_type_i;double count=10,value=0;double input_data_int=0,input_data_dec=0;double inputdata1=0,inputdata2=0;char datatostr_buffer10;bool decimal=false;以上代碼是添加的全局變量，為正確獲取鍵盤輸入供所有按鈕函數(shù)使用。/ todo: add extra initialization herem_operatorbox.addstring(-);m_operatorbox.addstring(*);m_operatorbox.addstring(/

4、);m_operatorbox.addstring(+);以上代碼是初始化列表框，并使其在程序運(yùn)行時(shí)具有“加”“減”“乘”“除”可選擇功能。void cmycalculatordlg:on1button() if(decimal)input_data_dec=input_data_dec+1/count;count=10*count;else input_data_int=10*input_data_int+1; value=input_data_int+input_data_dec; _gcvt(value,10,datatostr_buffer); m_showresultedit=(lp

5、ctstr)datatostr_buffer;/ todo: add your control notification handler code hereupdatedata(false);void cmycalculatordlg:on2button() if(decimal)input_data_dec=input_data_dec+2/count;count=10*count;else input_data_int=10*input_data_int+2; value=input_data_int+input_data_dec; _gcvt(value,10,datatostr_buf

6、fer); m_showresultedit=(lpctstr)datatostr_buffer;/ todo: add your control notification handler code hereupdatedata(false);void cmycalculatordlg:on3button() if(decimal)input_data_dec=input_data_dec+3/count;count=10*count;else input_data_int=10*input_data_int+3; value=input_data_int+input_data_dec; _g

7、cvt(value,10,datatostr_buffer); m_showresultedit=(lpctstr)datatostr_buffer;/ todo: add your control notification handler code hereupdatedata(false);void cmycalculatordlg:on4button() if(decimal)input_data_dec=input_data_dec+4/count;count=10*count;else input_data_int=10*input_data_int+4; value=input_d

8、ata_int+input_data_dec; _gcvt(value,10,datatostr_buffer); m_showresultedit=(lpctstr)datatostr_buffer;/ todo: add your control notification handler code hereupdatedata(false);void cmycalculatordlg:on5button() if(decimal)input_data_dec=input_data_dec+5/count;count=10*count;else input_data_int=10*input

9、_data_int+5; value=input_data_int+input_data_dec; _gcvt(value,10,datatostr_buffer); m_showresultedit=(lpctstr)datatostr_buffer;/ todo: add your control notification handler code hereupdatedata(false);void cmycalculatordlg:on6button() if(decimal)input_data_dec=input_data_dec+6/count;count=10*count;el

10、se input_data_int=10*input_data_int+6; value=input_data_int+input_data_dec; _gcvt(value,10,datatostr_buffer); m_showresultedit=(lpctstr)datatostr_buffer;/ todo: add your control notification handler code hereupdatedata(false);void cmycalculatordlg:on7button() if(decimal)input_data_dec=input_data_dec

11、+7/count;count=10*count;else input_data_int=10*input_data_int+7; value=input_data_int+input_data_dec; _gcvt(value,10,datatostr_buffer); m_showresultedit=(lpctstr)datatostr_buffer;/ todo: add your control notification handler code hereupdatedata(false);void cmycalculatordlg:on8button() if(decimal)inp

12、ut_data_dec=input_data_dec+8/count;count=10*count;else input_data_int=10*input_data_int+8; value=input_data_int+input_data_dec; _gcvt(value,10,datatostr_buffer); m_showresultedit=(lpctstr)datatostr_buffer;/ todo: add your control notification handler code hereupdatedata(false);void cmycalculatordlg:

13、on9button() if(decimal)input_data_dec=input_data_dec+9/count;count=10*count;else input_data_int=10*input_data_int+9; value=input_data_int+input_data_dec; _gcvt(value,10,datatostr_buffer); m_showresultedit=(lpctstr)datatostr_buffer;/ todo: add your control notification handler code hereupdatedata(fal

14、se);void cmycalculatordlg:on0button() if(decimal)input_data_dec=input_data_dec+0/count;count=10*count;else input_data_int=10*input_data_int+0; value=input_data_int+input_data_dec; _gcvt(value,10,datatostr_buffer); m_showresultedit=(lpctstr)datatostr_buffer;/ todo: add your control notification handl

15、er code hereupdatedata(false);void cmycalculatordlg:ondecimalbutton() decimal=true;/ todo: add your control notification handler code herevoid cmycalculatordlg:onequalbutton() inputdata2=input_data_int+input_data_dec;decimal=false;input_data_int=0;input_data_dec=0;count=10;switch(calculator_type_i)c

16、ase 0: value=inputdata1-inputdata2; break; case 1: value=inputdata1*inputdata2; break; case 2: if(inputdata2=0) messagebox(除數(shù)不能為0!); break; else value=inputdata1/inputdata2; break; case 3: value=inputdata1+inputdata2; break;_gcvt(value,10,datatostr_buffer);m_showresultedit=(lpctstr)datatostr_buffer;

17、updatedata(false); void cmycalculatordlg:onchangeshowresultedit() / todo: if this is a richedit control, the control will not/ send this notification unless you override the cdialog:oninitdialog()/ function and call cricheditctrl().seteventmask()/ with the enm_change flag ored into the mask./ todo:

18、add your control notification handler code herevoid cmycalculatordlg:onerrspaceshowresultedit() / todo: add your control notification handler code herevoid cmycalculatordlg:onselchangeoperatorlist() inputdata1=input_data_int+input_data_dec; decimal=false; input_data_int=0; input_data_dec=0; count=10; calculator_type_i=m_operatorbox.g