简单的用c语言写一个计算器程式,加减乘除能用就好
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参考技术A 简单的用c语言写一个计算器程式,加减乘除能用就好 #include"stdio.h"void main()
float a,b,c;
char e;
printf("input a,e,b\n");/*输入两个数和符号,例如3+8*/
scanf("%f%c%f",&a,&e,&b);
switch(e)
case '+':c=a+b;break;
case '-':c=a-b;break;
case '*':c=a*b;break;
case '/':
if(b==0.0) printf("error\n");
else c=a/b;break;
printf("%f%c%f=%f",a,e,b,c);
如何用vc++编写一个简单的(只有加减乘除)计算器程式?
先设定介面如下
加法按钮程式码
void CMy03Dlg::OnBnClickedButton1()
TODO:在此新增控制元件通知处理程式程式码
UpdateData(TRUE);
m_Nub3=m_Nub1+m_Nub2;
UpdateData(FALSE);
减法按钮程式码
void CMy03Dlg::OnBnClickedButton2()
TODO:在此新增控制元件通知处理程式程式码
UpdateData(TRUE);
m_Nub3=m_Nub1-m_Nub2;
UpdateData(FALSE);
乘法按钮程式码
void CMy03Dlg::OnBnClickedButton3()
TODO:在此新增控制元件通知处理程式程式码
UpdateData(TRUE);
m_Nub3=m_Nub1*m_Nub2;
UpdateData(FALSE);
除法按钮程式码
void CMy03Dlg::OnBnClickedButton4()
TODO:在此新增控制元件通知处理程式程式码
UpdateData(TRUE);
if(m_Nub2!=0)
m_Nub3=m_Nub1 / m_Nub2;
else
AfxMessageBox("被除数不能为0");
UpdateData(FALSE);
清除按钮程式码
void CMy03Dlg::OnBnClickedButton5()
TODO:在此新增控制元件通知处理程式程式码
UpdateData(TRUE);
m_Nub3=0;
m_Nub1=0;
m_Nub2=0;
UpdateData(FALSE);
结束按钮程式码
void CMy03Dlg::OnBnClickedButton6()
TODO:在此新增控制元件通知处理程式程式码
CDialog::OnOK();
如果只允许在输入框中输入资料应该怎样处理?
制作托盘程式
目的:在工作列中建立一个图示,使该程式永远驻留在记忆体中。例如邮件检查程式可以作为驻留程式,一旦有邮件来了,就可以接收邮件。
Shell_NotifyIcon函式传送讯息来增加、删除、修改工作列的图示
BOOL TrayMessage(HWND hWnd, DWORD dwMessage, HICON hIcon, PSTR pszTip)
BOOL res;
NOTIFYICONDATA tnd;
tnd.cbSize = sizeof(NOTIFYICONDATA);
tnd.hWnd = hWnd;
tnd.uID = IDI_ICON1;
tnd.uFlags = NIF_MESSAGE|NIF_ICON|NIF_TIP;
tnd.uCallbackMessage = WM_MY_TRAY_NOTIFICATION;
tnd.hIcon = hIcon;
lstrcpyn(tnd.szTip, pszTip, sizeof(tnd.szTip));
res = Shell_NotifyIcon(dwMessage, &tnd); dwMessage为NIM_ADD从工作列中新增图示、NIM_DELETE从工作列中删除图示、NIM_MODIFY改变工作列中图示
if (hIcon)
DestroyIcon(hIcon);
return res;
定义一个回拨讯息:WM_MY_TRAY_NOTIFICATION
在DLG的CPP档案中,
#define WM_MY_TRAY_NOTIFICATION WM_USER+100
为对话方块新增讯息对映ON_MESSAGE(WM_MY_TRAY_NOTIFICATION,OnTrayNotification)
在DLG的标头档案中应该有
public:
long m_Nub1;
float m_Nub3;
CBitmapButton Button;
afx_msg void OnBnClickedButton1();
long m_Nub2;
afx_msg void OnBnClickedButton2();
afx_msg void OnBnClickedButton4();
afx_msg void OnBnClickedButton5();
afx_msg void OnBnClickedButton3();
afx_msg void OnBnClickedButton6();
afx_msg void OnBnClickedButton7();
afx_msg LRESULT OnTrayNotification(WPARAM wparam, LPARAM lparam);
在DLG的CPP档案中应该有
BEGIN_MESSAGE_MAP(CMailCheckDlg, CDialog)
……
ON_MESSAGE(WM_MY_TRAY_NOTIFICATION,OnTrayNotification)
……
END_MESSAGE_MAP()
并定义一个回拨讯息函式
LRESULT CMailCheckDlg::OnTrayNotification(WPARAM wparam, LPARAM lparam)
switch (lparam )
case WM_RBUTTONUP:
case WM_LBUTTONDBLCLK:修改不同的按钮处理事件,以观察图示退出效果。
ShowWindow(SW_SHOW);
TrayMessage(m_hWnd, NIM_DELETE, NULL, "");从工作列中删除图示
return 0;
在对话方块视窗上新增“驻留”按钮,双击按钮新增程式码
void CMailCheckDlg::OnBnClickedButton1()
TODO:在此新增控制元件通知处理程式程式码
下面程式向工作列新增图示
TrayMessage(m_hWnd, NIM_ADD, NULL, "计算器程式");
TrayMessage(m_hWnd, NIM_MODIFY, m_hIcon, "计算器程式");
ShowWindow(SW_HIDE);
用MFC编写一个简单的加减乘除计算器
我有程式,加31782771群
c语言计算器程式设计包含加减乘除简单的函式运算
实用计算器之程式设计
[摘 要]多用计算器的构思及设计程式码
[关键词]多用计算器;设计
数值计算可以说是日常最频繁的工作了,WIN98提供了“计算器”软体供使用者使用,该软体可以处理一般的一步四则运算,例如:3+2、5/3等等,但在日常中使用者经常遇到多步四则运算问题,例如:3+4*5-4/2,45*34/2+18*7等等,那么该个计算器就无法胜任了,作者制作了一个实用的计算器,该计算器新增不少功能:(程式介面如图)
1.可以实现连续的四则运算
2.可以实现输入式子的显示
3.可以方便计算个人所得税
4.滑鼠、键盘均可输入资料
5.操作介面友好
6.击键可发声
构建该个计算器所需研究及解决的核心问题有如下几个:1、连乘求值?2、字元显示 3、键盘输入?4、击键发声?5、个人所得税法规,为了使大家对程式有更一步认识,现将程式码提供给读者参考:
*定义阵列及窗体变数
Dim number2(0 To 50) As Double
Dim number(0 To 50) As Double
Dim z As Integer
Dim k As Integer, r As Integer
Dim j As Integer
Dim str As String
*呼叫名为“playsound”的API函式
Private Declare Function PlaySound Lib "winmm.dll" Alias "PlaySoundA" (ByVal lpszName As String, ByVal hModule As Long, ByVal dwFlags As Long) As Long
Private Const SND_FILENAME = &H20000?
Private Const SND_ASYNC = &H1?
Private Const SND_SYNC = &H0
*判断通用过程
Sub pianduan(p As String)
r = 0
Dim i As Integer, l As Integer, h As Integer
h = 0
i = 1
If InStr(Trim$(p), "*") <> 0 Then
k = k + 1
End If
If InStr(Trim$(p), "/") <> 0 Then
r = r + 1
End If
End Sub
*连乘通用过程(略)
*各按钮事件过程
Private sub Command1_Click(Index As Integer)
PlaySound App.Path & "\start.wav", 0, SND_SYNC
Text1.Text = Text1.Text + Command1(Index).Caption
Text2.Text = Text2.Text + Command1(Index).Caption
Text1.SetFocus
End Sub
rivate sub Command10_Click()
PlaySound App.Path & "\start.wav", 0, SND_SYNC
str = Text3.Text
End Sub
Private sub Command11_Click()
PlaySound App.Path & "\start.wav", 0, SND_SYNC
Text3.Text = str
End Sub
rivate sub Command2_Click()
PlaySound App.Path & "\start.wav", 0, SND_SYNC
Dim totle As Double
Dim n As Integer
Call pianduan(Text1.Text)
If k >= 1 Or r >= 1 Then
Call liancheng(totle)
number2(z) = totle
If Mid$(Trim$(Text1.Text), 1, 1) = "-" Then
number2(z) = -totle
End If
k = 0: r = 0
Else
number2(z) = Val(Text1.Text)
End If
Text1.Text = ""
Text2.Text = Text2 + "+"
z = z + 1
Text1.SetFocus
End Sub
rivate sub Command3_Click()
PlaySound App.Path & "\start.wav", 0, SND_SYNC
Dim totle As Double
Dim n As Integer
Call pianduan(Text1.Text)
If k >= 1 Or r >= 1 Then
Call liancheng(totle)
number2(z) = totle
If Mid$(Trim$(Text1.Text), 1, 1) = "-" Then
number2(z) = -totle
End If
k = 0: r = 0
Else
number2(z) = Val(Text1.Text)
End If
Text1.Text = ""
Text2.Text = Text2 + "-"
Text1.Text = Text1.Text & "-"
z = z + 1
Text1.SetFocus
End Sub
Private sub Command4_Click()
PlaySound App.Path & "\start.wav", 0, SND_SYNC
Text2.Text = Text2.Text + "*"
Text1.Text = Text1.Text + "*"
Text1.SetFocus
End Sub
rivate sub Command5_Click()
PlaySound App.Path & "\start.wav", 0, SND_SYNC
Text2.Text = Text2 + "/"
Text1.Text = Text1 + "/"
Text1.SetFocus
End Sub
Private sub Command6_Click()
PlaySound App.Path & "\sound.wav", 0, SND_SYNC
Dim totle As Double
Dim n As Integer
Call pianduan(Text1.Text)
If k >= 1 Or r >= 1 Then
Call liancheng(totle)
number2(z) = totle
If Mid$(Trim$(Text1.Text), 1, 1) = "-" Then
number2(z) = -totle
End If
k = 0: r = 0
Else
number2(z) = Val(Text1.Text)
End If
Text1.Text = ""
z = z + 1
Dim dengyu As Double
Dim v As Integer
For v = 0 To 50
dengyu = dengyu + number2(v)
Next v
If dengyu < 0 Then
Text3.ForeColor = &HFF&
Else
Text3.ForeColor = &HFF0000
End If
Text3.Text = dengyu
Text1.SetFocus
If Len(Text3.Text) >= 14 Then
calcresult.Show
End If
End Sub
rivate sub Command7_Click()
PlaySound App.Path & "\start.wav", 0, SND_SYNC
z = 0: k = 0: r = 0: j = 0
Dim i As Integer
For i = 0 To 50
number(i) = 0
number2(i) = 0
Next i
Text1.Text = ""
Text2.Text = ""
Text3.Text = ""
Text1.SetFocus
End Sub
rivate sub Command8_Click()
PlaySound App.Path & "\start.wav", 0, SND_SYNC
If Val(Text3.Text) = 0 Then
MsgBox "除数不能为0!"
Exit Sub
End If
Text3.Text = 1 / Val(Text3.Text)
End Sub
Private sub Command9_Click()
PlaySound App.Path & "\start.wav", 0, SND_SYNC
Text3.ForeColor = &HFF0000
Text3.Text = Val(Text3.Text) * Val(Text3.Text)
End Sub
rivate sub muninter_Click()
Dim i
i = Shell("C:\Program Files\InterExplorer\iexplore.exe", vbMaximizedFocus)
End Sub
rivate sub munmp3_Click()
Dim i
i = Shell("C:\Program Files\Windows Media Player\mplayer2", vbNormalNoFocus)
End Sub
Private sub mun *** _Click()
Dialog.Show
End Sub
rivate sub muntax_Click()
tax.Show
End Sub
rivate sub munver_Click()
ver.Show
End Sub
rivate sub notepad_Click()
Dim i
i = Shell("c:\windows\notepad", vbNormalFocus)
End Sub
Private sub Text1_KeyPress(KeyAscii As Integer)
PlaySound App.Path & "\start.wav", 0, SND_SYNC
Dim num As Integer
num = Val(KeyAscii)
If num > 47 And num < 58 Then
Text1.Text = Text1.Text + CStr(num - 48)
Text2.Text = Text2.Text + CStr(num - 48)
End If
If num = 46 Then
Text1.Text = Text1.Text + "."
Text2.Text = Text2.Text + "."
End If
If KeyAscii = 43 Then
Dim totle As Double
Dim n As Integer
Call pianduan(Text1.Text)
If k >= 1 Or r >= 1 Then
Call liancheng(totle)
number2(z) = totle
If Mid$(Trim$(Text1.Text), 1, 1) = "-" Then
number2(z) = -totle
End If
k = 0: r = 0
Else
number2(z) = Val(Text1.Text)
End If
Text1.Text = ""
Text2.Text = Text2 + "+"
z = z + 1
End If
If KeyAscii = 45 Then
Call pianduan(Text1.Text)
If k >= 1 Or r >= 1 Then
Call liancheng(totle)
number2(z) = totle
If Mid$(Trim$(Text1.Text), 1, 1) = "-" Then
number2(z) = -totle
End If
k = 0: r = 0
Else
number2(z) = Val(Text1.Text)
End If
Text1.Text = ""
Text2.Text = Text2 + "-"
Text1.Text = Text1.Text & "-"
z = z + 1
End If
If KeyAscii = 42 Then
Text2.Text = Text2.Text + "*"
Text1.Text = Text1.Text + "*"
End If
If KeyAscii = 47 Then
Text2.Text = Text2.Text + "/"
Text1.Text = Text1.Text + "/"
End If
If KeyAscii = vbKeyReturn Then
PlaySound App.Path & "\sound.wav", 0, SND_SYNC
Call pianduan(Text1.Text)
If k >= 1 Or r >= 1 Then
Call liancheng(totle)
number2(z) = totle
If Mid$(Trim$(Text1.Text), 1, 1) = "-" Then
number2(z) = -totle
End If
k = 0: r = 0
Else
number2(z) = Val(Text1.Text)
End If
Text1.Text = ""
z = z + 1
Dim dengyu As Double
Dim v As Integer
For v = 0 To 50
dengyu = dengyu + number2(v)
Next v
If dengyu < 0 Then
Text3.ForeColor = &HFF&
Else
Text3.ForeColor = &HFF0000
End If
Text3.Text = dengyu
End If
If KeyAscii = vbKeyEscape Then
z = 0: k = 0: r = 0: j = 0
Dim i As Integer
For i = 0 To 50
number(i) = 0
number2(i) = 0
Next i
Text1.Text = ""
Text2.Text = ""
Text3.Text = ""
Text1.SetFocus
End If
If Len(Text3.Text) >= 14 Then
calcresult.Show
End If
End Sub
rivate sub Text3_Change()
tax2.Text1 = Text3.Text
End Sub
用c语言编写能运算加减乘除的计算器程式,用到栈
#include "stdio.h"
#include "string.h"
#include "ctype.h"
#include "math.h"
expression evaluate
#define iMUL 0
#define iDIV 1
#define iADD 2
#define iSUB 3
#define iCap 4
#define LtKH 5
#define RtKH 6
#define MaxSize 100
void iPush(float);
float iPop();
float StaOperand[MaxSize];
int iTop=-1;
char Srcexp[MaxSize];
char Capaexp[MaxSize];
char RevPolishexp[MaxSize];
float NumCapaTab[26];
char validexp[]="*/+-()";
char NumSets[]="0123456789";
char StackSymb[MaxSize];
int operands;
void NumsToCapas(char [], int , char [], float []);
int CheckExpress(char);
int PriorChar(char,char);
int GetOperator(char [], char);
void counterPolishexp(char INexp[], int slen, char Outexp[]);
float CalcRevPolishexp(char [], float [], char [], int);
void main()
int ilen;
float iResult=0.0;
printf("enter a valid number string:\n");
memset(StackSymb,0,MaxSize);
memset(NumCapaTab,0,26); A--NO.1, B--NO.2, etc.
gets(Srcexp);
ilen=strlen(Srcexp);
printf("source expression:%s\n",Srcexp);
NumsToCapas(Srcexp,ilen,Capaexp,NumCapaTab);
printf("Numbers listed as follows:\n");
int i;
for (i=0; i<operands; ++i)
printf("%.2f ",NumCapaTab[i]);
printf("\nCapaexp listed in the following:\n");
printf("%s\n",Capaexp);
ilen=strlen(Capaexp);
counterPolishexp(Capaexp,ilen,RevPolishexp);
printf("RevPolishexp:\n%s\n",RevPolishexp);
ilen=strlen(RevPolishexp);
iResult=CalcRevPolishexp(validexp, NumCapaTab, RevPolishexp,ilen);
printf("\ncounterPolish expression:\n%s%.6f\n",Srcexp,iResult);
void iPush(float value)
if(iTop<MaxSize) StaOperand[++iTop]=value;
float iPop()
if(iTop>-1)
return StaOperand[iTop--];
return -1.0;
void NumsToCapas(char Srcexp[], int slen, char Capaexp[], float NumCapaTab[])
char ch;
int i, j, k, flg=0;
int sign;
float val=0.0,power=10.0;
i=0; j=0; k=0;
while (i<slen)
ch=Srcexp[i];
if (i==0)
sign=(ch=='-')?-1:1;
if(ch=='+'||ch=='-')
ch=Srcexp[++i];
flg=1;
if (isdigit(ch))
val=ch-'0';
while (isdigit(ch=Srcexp[++i]))
val=val*10.0+ch-'0';
if (ch=='.')
while(isdigit(ch=Srcexp[++i]))
val=val+(ch-'0')/power;
power*=10;
end if
if(flg)
val*=sign;
flg=0;
end if
write Capaexp array
write NO.j to array
if(val)
Capaexp[k++]='A'+j;
Capaexp[k++]=ch;
NumCapaTab[j++]=val; A--0, B--1,and C, etc.
else
Capaexp[k++]=ch;
val=0.0;
power=10.0;
i++;
Capaexp[k]='\0';
operands=j;
float CalcRevPolishexp(char validexp[], float NumCapaTab[], char RevPolishexp[], int slen)
float sval=0.0, op1,op2;
int i, rt;
char ch;
recursive stack
i=0;
while((ch=RevPolishexp[i]) && i<slen)
switch(rt=GetOperator(validexp, ch))
case iMUL: op2=iPop(); op1=iPop();
sval=op1*op2;
iPush(sval);
break;
case iDIV: op2=iPop(); op1=iPop();
if(!fabs(op2))
printf("overflow\n");
iPush(0);
break;
sval=op1/op2;
iPush(sval);
break;
case iADD: op2=iPop(); op1=iPop();
sval=op1+op2;
iPush(sval);
break;
case iSUB: op2=iPop(); op1=iPop();
sval=op1-op2;
iPush(sval);
break;
case iCap: iPush(NumCapaTab[ch-'A']);
break;
default: ;
++i;
while(iTop>-1)
sval=iPop();
return sval;
int GetOperator(char validexp[],char oper)
int oplen,i=0;
oplen=strlen(validexp);
if (!oplen) return -1;
if(isalpha(oper)) return 4;
while(i<oplen && validexp[i]!=oper) ++i;
if(i==oplen || i>=4) return -1;
return i;
int CheckExpress(char ch)
int i=0;
char ;
while((=validexp[i]) && ch!=) ++i;
if (!)
return 0;
return 1;
int PriorChar(char curch, char stach)
栈外优先顺序高于(>)栈顶优先顺序时,才入栈
否则(<=),一律出栈
if (curch==stach) return 0; 等于时应该出栈
else if (curch=='*' || curch=='/')
if(stach!='*' && stach!='/')
return 1;
else if (curch=='+' || curch=='-')
if (stach=='(' || stach==')')
return 1;
else if (curch=='(')
if (stach==')')
return 1;
return 0;
void counterPolishexp(char INexp[], int slen, char Outexp[])
int i, j, k,pr;
char t;
i=0;
j=k=0;
while (INexp[i]!='=' && i<slen)
if (INexp[i]=='(')
StackSymb[k++]=INexp[i];
iPush(*(INexp+i));
else if(INexp[i]==')')
if((t=iPop())!=-1)
while((t=StackSymb[k-1])!='(')
Outexp[j++]=t;
k--;
k--;
else if (CheckExpress(INexp[i])) is oparator
printf("operator %c k=%d\n",INexp[i],k);
while (k)
iPush(*(INexp+i));
if(pr=PriorChar(INexp[i],StackSymb[k-1]))
break;
else
if ((t=iPop())!=-1)
t=StackSymb[k-1]; k--;
Outexp[j++]=t;
end while
StackSymb[k++]=INexp[i]; mon process
else if() 变数名
printf("operand %c k=%d\n",INexp[i],k);
Outexp[j++]=INexp[i];
i++;
while (k)
t=StackSymb[k-1]; k--;
Outexp[j++]=t;
Outexp[j]='\0';
注:程式源于“百度知道”
用verilog编写一个最简单的加减乘除的计算器的程式
verilog是有加法器乘法器的。也直接识别 + - * / 符号。
module kjasdja(a,option,b,result);
input option,a,b;
output result;
always @(a,b,option)
begin
result_r=0; 结果暂存器清零
case(option)
+:result_r=a+b;
-:result_r=a-b;
*:result_r=a*b;
/:result_r=a/b;
assign result =result_r;
endmodule
大概演算法就这样。写的仓促,语法可能有误。另外除法reg型别只能储存整数部分,小数通过移位操作实现,比较麻烦。比如3/5=0.6
做的时候先3=30,然后30/5=6,然后对6在数码管的显示进行调整就好。把6显示在小数点后面1位就好
用vb编写一个计算器程式,实现加减乘除,
Dim v As Boolean
Dim s As Integer
Dim X As Double
Dim Y As Double
Private Sub Command1_Click(Index As Integer)
If Form1.Tag = "T" Then
If Index = 10 Then
Text1.Text = "0"
Else
Text1.Text = Command1(Index).Caption
End If
Form1.Tag = ""
Else
Text1.Text = Text1.Text & Command1(Index).Caption
End If
End Sub
Private Sub Command2_Click(Index As Integer)
Form1.Tag = "T"
If v Then
X = Val(Text1.Text)
v = Not v
Else
Y = Val(Text1.Text)
Select Case s
Case 0
Text1.Text = X + Y
Case 1
Text1.Text = X - Y
Case 2
Text1.Text = X * Y
Case 3
If Y <> 0 Then
Text1.Text = X / Y
Else
MsgBox ("不能以0为除数")
Text1.Text = X
v = False
End If
Case 4
Y = 0
v = False
End Select
X = Val(Text1.Text)
End If
s = Index
End Sub
Private Sub Frame1_DragDrop(Source As Control, X As Single, Y As Single)
End Sub
控制元件自己新增吧,空间名要和程式码名一致
求一简单的加减乘除计算器c++程式
#include<stdio.h>
#include<math.h>
void main()
float a,b;
char C;
while(1)
scanf("%f%c%f",&a,&C,&b);
if((C!='+')&&(C!='-')&&(C!='*')&&(C!='/'))
break;
switch(C)
case '+': printf("%f+%f=%f",a,b,a+b);
break;
case '-': printf("%f-%f=%f",a,b,a-b);
break;
case '*': printf("%f*%f=%f",a,b,a*b);
break;
case '/': printf("%f/%f=%f",a,b,a/b);
break;
想改成按1 2 3 4分别为加减乘除,只需要将程式中的+ - * / 改成1 2 3 4即可。按除了+ - * / 以外的键就会退出。
用c++语言编写一个简单的计算器程式,会加减乘除就行,本人初学不太会,特训求帮助
这个是最简单,简陋的计算器。很多情况没考虑进去,例如除数不能为0之类的,真要写完整的话程式码还要更多。
程式码如下: #include <iostream>using namespace std;int main() float a, b, result; char operation; cout << "请输入算式,如1+2并回车:" << endl; cin >> a >> operation >> b; switch(operation) case '+': result = a + b; break; case '-': result = a - b; break; case '*': result = a * b; break; case '/': result = a / b; break; default: cout << "输入非法,程式退出!" << endl; return -1; cout << endl << "结果为:" << endl << a << operation << b << "=" << result << endl; return 0;
知道switch函式 吗 用这个就行
建俩个int型变数 一个字元型变数
怎样用C语言编写一个简单的可以进行加减乘除运算混合运算的计算器?
用C语言编写一个简单的可以进行加减乘除运算混合运算的计算器的方法:
1、打开visual C++ 6.0-文件-新建-文件-C++ Source File;
2、输入预处理命令和主函数:
#include<stdio.h> /*函数头:输入输出头文件*/
void main()/*空类型:主函数*/
3、定义变量:
int a,b,d; /*定义变量的数据类型为整型*/
char c;/*定义变量的数据类型为字符型*/
4、输入四则运算式:
printf("输入如“3*4”或“5+2”的四则运算式:");/*输出文字提示*/
scanf("%d%c%d",&a,&c,&b);/*输入四则运算式*/
5、判断运算符号:
switch(c) /*判断运算符号*/
case'+':d=a+b;break;/*进行加法运算*/
case'-':d=a-b;break;/*进行减法运算*/
case'*':d=a*b;break;/*进行乘法运算*/
case'/':d=a/b;break; /*进行除法运算*/
6、输出结果:
printf("%d%c%d=%d\\n",a,c,b,d);/*输出结果*/
完整的源代码:
#include<stdio.h> /*函数头:输入输出头文件*/
void main()/*空类型:主函数*/
int a,b,d;/*定义变量的数据类型为整型*/
char c;/*定义变量的数据类型为字符型*/
printf("输入如“3*4”或“5+2”的四则运算式:");/*输出文字提示*/
scanf("%d%c%d",&a,&c,&b);/*输入四则运算式*/
switch(c)/*判断运算符号*/
case'+':d=a+b;break;/*进行加法运算*/
case'-':d=a-b;break;/*进行减法运算*/
case'*':d=a*b;break;/*进行乘法运算*/
case'/':d=a/b;break;/*进行除法运算*/
printf("%d%c%d=%d\\n",a,c,b,d);/*输出结果*/
参考技术A 这是我写的一个win32框架,用你的c代码嵌入里面的计算代码你可以用纯c实现,很简单/*使用DEVC++5.0编译通过,新手朋友请注意,启动顺序为打开DEVC++ - 新建项目 - 新建windows application程序(这里不是控制台程序),
然后新建HELLOWORD项目,清空MAIN.C代码,将本代码复制进去编译运行即可,
具体功能通过修改C代码实现,大家自己去探索。代码保存为.C文件,直接打开无法通过*/
截图:
代码如下:
#include <windows.h>
//#include <stdlib.h>
#define IDC_EDIT1 201 //自定义控件识别号
#define IDC_EDIT2 202
#define IDC_STATIC 301
#define IDC_BTN1 101
//回调函数.............................................................................
LRESULT CALLBACK WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
static TCHAR sss[256]; //不同的case分支之间传值一定要定义全局变量,否则会出错
static TCHAR sss1[256];
static int len,size,i,j,x=10,y=200;
static double sun;
TCHAR szText[256];
HWND edit1,edit2;
HWND an1;
HWND sta1;
switch(uMsg) //消息分支选择,注意SWITCH-CASE结构中,BREAK代表跳出当前SWITCH,RETURN代表结束整个函数。
case WM_COMMAND:
switch(LOWORD(wParam)) //点击不同的控件显示,走不同的处理路径
case IDC_BTN1: //点击按钮1触发消息
//MessageBox(hwnd,"提交成功","提示",MB_OK|MB_ICONINFORMATION);
len=GetDlgItemText(hwnd,IDC_EDIT1,sss,255); //获取控件内容函数 ,返回值为控件文本字节长度
//MessageBox(hwnd,sss,"输入内容",MB_OK);
GetDlgItemText(hwnd,IDC_EDIT2,sss1,255);
sun=atof(sss)+atof(sss1);
/*处理数据输入和涉及到数字运算用这个函数转换数据类型:【atof()】是把字符串转换成整型数的一个函数,扫描参数nptr字符串,跳过前面的空格字符,直到遇上数字或正负符号才开始做转换,而再遇到非数字或字符串结束时('\0')才结束转换,并将结果返回.默认返回类型为double类型,包含在头文件stdlib.h中。反方向函数为itoa()将整数转换成字符串*/
InvalidateRect(hwnd,NULL,TRUE); //发送刷新指令 ,这个很关键。要不然窗口不会及时显示结果。。
break;
default:
break;
break;
break;
case WM_DESTROY: //当前窗口被销毁时
PostQuitMessage(0); //发出退出程序的消息
break;
case WM_CLOSE: //右上角关闭按钮消息
DestroyWindow(hwnd); //销毁窗口
break;
case WM_CREATE: //控件创建消息
edit1 = CreateWindow("EDIT",NULL, WS_CHILD|WS_VISIBLE|WS_BORDER, 220, 30, 100,25,hwnd,(HMENU)IDC_EDIT1, NULL, NULL); //创建编辑框控件
edit2 = CreateWindow("EDIT",NULL, WS_CHILD|WS_VISIBLE|WS_BORDER, 220, 60, 100,25,hwnd,(HMENU)IDC_EDIT2, NULL, NULL); //创建编辑框控件
an1 = CreateWindow("button","计算",WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON,340,60,50,25,hwnd,(HMENU)IDC_BTN1,NULL,NULL); //创建按钮控件
//sta1= CreateWindow("STATIC","+",WS_CHILD|WS_VISIBLE|SS_CENTER,70,10,300,200,hwnd,(HMENU)IDC_STATIC,NULL,NULL); //创建静态文本框控件,画布,美化作用,下一步再深入研究
break;
case WM_PAINT: //【重绘窗口函消息 】
HDC hdc; //定义输出设备句柄
//RECT rect; //定义一块显示区域,DrawText 函数需要的参数
PAINTSTRUCT ps = 0; //定义一个 数组存放字符串
hdc = BeginPaint(hwnd,&ps); //开始重绘
/******************************************核心程序代码区******************************************************************/
SetTextColor(hdc, RGB(255,0,0)); //设置字体颜色
Rectangle(hdc,2,2,818,555);
Rectangle(hdc,10,190,810,550); //画矩形,必须在正文之前显示框,否则正文会被覆盖
TextOut(hdc,350,200,TEXT("九九乘法表"),10); //直接文本显示
for(i=1;i<=9;i++)
for(j=1;j<=i;j++)
size = wsprintf(szText,TEXT("%d×%d=%2d"),j,i,i*j); //将变量S,I的值按照格式符号%s%d转换后存入缓冲区szText,返回值为字节长度
/*注意:因为 wsprintf不支持浮点数,所以处理高精度数据计算式要用 swprintf代替*/
TextOut(hdc,x+j*80,y+i*25, szText,size);
TextOut(hdc,650,530,TEXT("小狗WINDOWS小程序"),17);
Rectangle(hdc,10,10,810,180); //矩形(美化类函数,形成边框效果)
TextOut(hdc,450,30,TEXT("简单的WIN32窗口框架,能够实现输入和显示"),39);
TextOut(hdc,100,30,TEXT("请输入参数A的值:"),16);
TextOut(hdc,100,60,TEXT("请输入参数B的值:"),16);
TextOut(hdc,100,90,TEXT("A+B= :"),len);
/*显示数字用以下代码*/
size = sprintf(szText,TEXT("%.4lf"),sun);
TextOut(hdc,220,90,szText,size);
/*显示文字或字母用以下代码
TextOut(hdc,550,30,sss,len);*/
/******************************************核心程序代码区******************************************************************/
EndPaint(hwnd,&ps); //结束重绘
break;
default:
return DefWindowProc(hwnd, uMsg, wParam, lParam);
return 0;
/*********************************************以下为主窗口函数**********************************************************************/
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
WNDCLASSEX wzgwind = 0; //窗口类结构, 为注册窗口类作准备
wzgwind.cbSize = sizeof(wzgwind); //WNDCLASSEX结构的大小
wzgwind.cbWndExtra = 0; //窗口额外内存, 没有, 设为0
wzgwind.hbrBackground = COLOR_WINDOW; //使用系统默认背景
//wzgwind.hbrBackground = (HBRUSH)GetStockObject(GRAY_BRUSH); //窗口背景, 这里使用灰色背景(另一种表示法)
wzgwind.hCursor = LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW)); //应用程序使用的鼠标类型
wzgwind.hIcon = LoadIcon(NULL, MAKEINTRESOURCE(IDI_APPLICATION)); //光标类型
wzgwind.hIconSm = NULL; //应用程序程序的小光标, 不管, 设为 NULL
wzgwind.hInstance = hInstance; //应用程序程序实例句柄, 由 WinMain 函数传递过来
wzgwind.lpfnWndProc = WndProc; //这个很重要, 就是当前窗口的消息处理函数, 传递 WndProc 的地址
wzgwind.lpszClassName = "wzgwind"; //创建类时使用的类名, 可以自定义
wzgwind.lpszMenuName = NULL; //菜单, 没有, 就使用 NULL
wzgwind.style = CS_HREDRAW | CS_VREDRAW; //类的风格, 垂直重绘, 水平重绘
ATOM nAtom = RegisterClassEx(&wzgwind);
if (!nAtom )
MessageBox(NULL, "注册失败", "Infor", MB_OK);
return 0;
HWND hwnd = CreateWindowEx(WS_EX_CLIENTEDGE,"wzgwind","win-gou",WS_VISIBLE|WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, /* x */
CW_USEDEFAULT, /* y */
840, /* width */
600, /* height */
NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,nCmdShow);
UpdateWindow(hwnd);
MSG msg = 0 ; //定义并初始化msg
while( msg.message != WM_QUIT ) //使用while循环,如果消息不是WM_QUIT消息,就继续循环
if( PeekMessage( &msg, 0, 0, 0, PM_REMOVE ) ) //查看应用程序消息队列,有消息时将队列中的消息派发出去。
TranslateMessage( &msg ); //将虚拟键消息转换为字符消息
DispatchMessage( &msg ); //分发一个消息给窗口程序。
UnregisterClass("wzgwind", wzgwind.hInstance);
return 0;
参考技术B #include<stdio.h>
main()
double a,b,w,x,y,z;
char ch;
while(scanf("%lf %c %lf",&a,&ch,&b)!=1)
if(ch=='*')
w=a*b;printf("%lf*%lf=%.2lf\n",a,b,w);
if(ch=='/')
if(b==0)printf("输入有误\n");
else x=a/b;printf("%lf/%lf=%.2lf\n",a,b,x);
if(ch=='+')
y=a+b;printf("%lf+%lf=%.2lf\n",a,b,y);
if(ch=='-')
z=a-b;printf("%lf-%lf=%.2lf\n",a,b,z);
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