Question

如何用vc++6.0制作简单的计算器

Answer 1

新建MFC工程"jisuanqiDlg"基本对话框，添加以下控件：
（1）文本框：用来显示计算结果；
默认ID为IDC_EDIT1，新建关联变量m_num.
（2）21个按钮：0-9、小数点、加、减、乘、除、=、删除、清空、开方、自然对数ln、常用对数log10；

详细代码如下：

/ jisuanqiDlg.cpp : implementation file
//

#include "stdafx.h"
#include "jisuanqi.h"
#include "jisuanqiDlg.h"
#include "math.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
CAboutDlg();

// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA

// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL

// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CJisuanqiDlg dialog

CJisuanqiDlg::CJisuanqiDlg(CWnd* pParent )
: CDialog(CJisuanqiDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CJisuanqiDlg)
m_num = 0.0;
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32

m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CJisuanqiDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CJisuanqiDlg)
DDX_Text(pDX, IDC_EDIT1, m_num);
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CJisuanqiDlg, CDialog)
//{{AFX_MSG_MAP(CJisuanqiDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
ON_BN_CLICKED(IDC_BUTTON2, OnButton2)
ON_BN_CLICKED(IDC_BUTTON3, OnButton3)
ON_BN_CLICKED(IDC_BUTTON4, OnButton4)
ON_BN_CLICKED(IDC_BUTTON5, OnButton5)
ON_BN_CLICKED(IDC_BUTTON6, OnButton6)
ON_BN_CLICKED(IDC_BUTTON7, OnButton7)
ON_BN_CLICKED(IDC_BUTTON8, OnButton8)
ON_BN_CLICKED(IDC_BUTTON9, OnButton9)
ON_BN_CLICKED(IDC_BUTTON14, OnButton0)
ON_BN_CLICKED(IDC_BUTTON15, OnButtonPoint)
ON_BN_CLICKED(IDC_BUTTON16, OnButtonEqual)
ON_BN_CLICKED(IDC_BUTTON13, OnButtonChu)
ON_BN_CLICKED(IDC_BUTTON12, OnButtonMul)
ON_BN_CLICKED(IDC_BUTTON11, OnButtonSub)
ON_BN_CLICKED(IDC_BUTTON10, OnButtonAdd)
ON_BN_CLICKED(IDC_BUTTON17, OnButtondelet)
ON_BN_CLICKED(IDC_BUTTON18, OnButtonclear)
ON_BN_CLICKED(IDC_BUTTON19, OnButtonkaifang)
ON_BN_CLICKED(IDC_BUTTON20, OnButtonziranduishu)
ON_BN_CLICKED(IDC_BUTTON21, OnButtonchangyongduishu)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CJisuanqiDlg message handlers

BOOL CJisuanqiDlg::OnInitDialog()//初始化变量
{
CDialog::OnInitDialog();

// Add "About..." menu item to system menu.

// IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);

CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}

// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon

// TODO: Add extra initialization here
t=true;
j=true;
i=10;
p=0;
q=0;
m_num=0;
m_lnum=0;

return TRUE; // return TRUE unless you set the focus to a control
}

void CJisuanqiDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}

// If you add a minimize button to your dialog, you will need the code below
// to draw the icon. For MFC applications using the document/view model,
// this is automatically done for you by the framework.

void CJisuanqiDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting

SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;

// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}

// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CJisuanqiDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}

void CJisuanqiDlg::OnButton1()
{
// TODO: Add your control notification handler code here

if(t)
{
m_num=m_num*10+1;
UpdateData(FALSE);

}
else
{
m_num=m_num+1.0/i;
i*=10;
UpdateData(FALSE);
}

}

void CJisuanqiDlg::OnButton2()
{
// TODO: Add your control notification handler code here

if(t)
{
m_num=m_num*10+2;
UpdateData(FALSE);

}
else
{
m_num=m_num+2.0/i;
i*=10;
UpdateData(FALSE);
}

}

void CJisuanqiDlg::OnButton3()
{
// TODO: Add your control notification handler code here

if(t)
{
m_num=m_num*10+3;
UpdateData(FALSE);

}
else
{
m_num=m_num+3.0/i;
i*=10;
UpdateData(FALSE);
}

}

void CJisuanqiDlg::OnButton4()
{
// TODO: Add your control notification handler code here

if(t)
{
m_num=m_num*10+4;
UpdateData(FALSE);

}
else
{
m_num=m_num+4.0/i;
i*=10;
UpdateData(FALSE);
}

}

void CJisuanqiDlg::OnButton5()
{
// TODO: Add your control notification handler code here

if(t)
{
m_num=m_num*10+5;
UpdateData(FALSE);

}
else
{
m_num=m_num+5.0/i;
i*=10;
UpdateData(FALSE);
}

}

void CJisuanqiDlg::OnButton6()
{
// TODO: Add your control notification handler code here

if(t)
{
m_num=m_num*10+6;
UpdateData(FALSE);

}
else
{
m_num=m_num+6.0/i;
i*=10;
UpdateData(FALSE);
}

}

void CJisuanqiDlg::OnButton7()
{
// TODO: Add your control notification handler code here

if(t)
{
m_num=m_num*10+7;
UpdateData(FALSE);

}
else
{
m_num=m_num+7.0/i;
i*=10;
UpdateData(FALSE);
}

}

void CJisuanqiDlg::OnButton8()
{
// TODO: Add your control notification handler code here

if(t)
{
m_num=m_num*10+8;
UpdateData(FALSE);

}
else
{
m_num=m_num+8.0/i;
i*=10;
UpdateData(FALSE);
}

}

void CJisuanqiDlg::OnButton9()
{
// TODO: Add your control notification handler code here

if(t)
{
m_num=m_num*10+9;
UpdateData(FALSE);

}
else
{
m_num=m_num+9.0/i;
i*=10;
UpdateData(FALSE);
}

}

void CJisuanqiDlg::OnButton0()
{
// TODO: Add your control notification handler code here
//UpdateData();

if(t)
{
m_num=m_num*10+0;
UpdateData(FALSE);

}
else
{
m_num=m_num+0.0/i;
i*=10;
UpdateData(FALSE);
}

}

void CJisuanqiDlg::OnButtonPoint()
{
// TODO: Add your control notification handler code here
int i=10;
t=false;

}

void CJisuanqiDlg::OnButtonEqual()
{
// TODO: Add your control notification handler code here

switch(r)
{

case '+':
{
m_num=m_num+m_lnum;
UpdateData(FALSE);
break;
}
case '-':
{
m_num=m_snum-m_num;
UpdateData(FALSE);
break;
}
case '*':
{
m_num=m_mnum*m_num;
UpdateData(FALSE);
break;
}
case '/':
{
if(m_num==0)
{
MessageBox("除数不能是0！");

}
else
{

m_num=m_cnum/m_num;
UpdateData(FALSE);
break;
}
}
}
t=true;

}

void CJisuanqiDlg::OnButtonMul()
{
// TODO: Add your control notification handler code here
r='*';
t=true;
m_mnum=m_num;
m_num=0;
UpdateData(FALSE);
}

void CJisuanqiDlg::OnButtonChu()
{
// TODO: Add your control notification handler code here
r='/';
t=true;
i=10;
m_cnum=m_num;
m_num=0;
UpdateData(FALSE);

}

void CJisuanqiDlg::OnButtonSub()
{
// TODO: Add your control notification handler code here
r='-';
i=10;
t=true;
if(j)
{
m_snum=m_num;
}
else
{
p=0;
adda[p]=m_num;
p++;
for(q=0;q<=p;q++)
{
m_lnum=m_lnum+adda[q];
q++;
}

m_num=m_lnum;
UpdateData(FALSE);
m_num=0;
m_snum=m_lnum;
}
m_num=0;

}

void CJisuanqiDlg::OnButtonAdd()
{
// TODO: Add your control notification handler code here
r='+';
t=true;
j=false;
i=10;
p=0;
adda[p]=m_num;
p++;
for(q=0;q<=p;q++)
{
m_lnum=m_lnum+adda[q];
q++;
}

m_num=m_lnum;
UpdateData(FALSE);
m_num=0;

}

void CJisuanqiDlg::OnButtondelet()
{
// TODO: Add your control notification handler code here
int p;
p=m_num/10;
m_num=p;
UpdateData(FALSE);

}

void CJisuanqiDlg::OnButtonclear()
{
// TODO: Add your control notification handler code here
t=true;
i=10;
j=true;
m_num=0;
m_lnum=0;
UpdateData(FALSE);

}

void CJisuanqiDlg::OnButtonkaifang()
{
// TODO: Add your control notification handler code here

m_num=sqrt(m_num);
UpdateData(FALSE);

}

void CJisuanqiDlg::OnButtonziranduishu()
{
// TODO: Add your control notification handler code here
m_num=log(m_num);
UpdateData(FALSE);

}

void CJisuanqiDlg::OnButtonchangyongduishu()
{
// TODO: Add your control notification handler code here
m_num=log10(m_num);
UpdateData(FALSE);

}

Answer 2

#include <stdio.h>
struct s_node
{
int data;
struct s_node *next;
};
typedef struct s_node s_list;
typedef s_list *link;
link operator=NULL;
link operand=NULL;

link push(link stack,int value)
{
link newnode;

newnode=(link) malloc(sizeof(s_list));
if(!newnode)
{
printf("\nMemory allocation failure!!!");
return NULL;
}
newnode->data=value;
newnode->next=stack;
stack=newnode;
return stack;
}

link pop(link stack,int *value)
{
link top;
if(stack !=NULL)
{
top=stack;
stack=stack->next;
*value=top->data;
free(top);
return stack;
}
else
*value=-1;
}

int empty(link stack)
{
if(stack==NULL)
return 1;
else
return 0;

}

int is_operator(char operator)
{
switch (operator)
{
case '+': case '-': case '*': case '/': return 1;
default:return 0;
}
}

int priority(char operator)
{
switch(operator)
{
case '+': case '-' : return 1;
case '*': case '/' : return 2;
default: return 0;
}
}

int two_result(int operator,int operand1,int operand2)
{
switch(operator)
{
case '+':return(operand2+operand1);
case '-':return(operand2-operand1);
case '*':return(operand2*operand1);
case '/':return(operand2/operand1);
}
}

void main()
{
char expression[50];
int position=0;
int op=0;
int operand1=0;
int operand2=0;
int evaluate=0;

printf("\nPlease input the inorder expression:");
gets(expression);

while(expression[position]!='\0'&&expression[position]!='\n')
{
if(is_operator(expression[position]))
{
if(!empty(operator))
while(priority(expression[position])<= priority(operator->data)&&
!empty(operator))
{
operand=pop(operand,&operand1);
operand=pop(operand,&operand2);
operator=pop(operator,&op);
operand=push(operand,two_result(op,operand1,operand2));
}
operator=push(operator,expression[position]);
}
else
operand=push(operand,expression[position]-48);
position++;
}
while(!empty(operator))
{
operator=pop(operator,&op);
operand=pop(operand,&operand1);
operand=pop(operand,&operand2);

operand=push(operand,two_result(op,operand1,operand2));
}
operand=pop(operand,&evaluate);
printf("The expression [%s] result is '%d' ",expression,evaluate);
getch();
}