用函数写一个运算器，只包括+,-,*,/四种运算即可。c语言。

#includestdio.h

创新互联主营扬中网站建设的网络公司,主营网站建设方案,app软件定制开发,扬中h5微信小程序定制开发搭建,扬中网站营销推广欢迎扬中等地区企业咨询

int main(void) {

int a, b;

char c;

scanf("%d%d %c", a, b, c);

if(c == '+')

printf("%d\n", (a + b));

else if(c == '-')

printf("%d\n", (a - b));

else if(c == '*')

printf("%d\n", (a * b));

else if(c == '/') {

if(b == 0)

printf("erro!\n");

else

printf("%lf\n", (a / b));

}

else

printf("Invalid operator!\n");

return 0;

}

如：

输入：2 3 *

输出：6

简单的用c语言写一个计算器程式，加减乘除能用就好

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; ioperands; ++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(iTopMaxSize) 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 (islen)

{

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]) islen)

{

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(ioplen 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]!='=' islen)

{

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

#includestdio.h

#includemath.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 iostreamusing 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

用c语言编写一个简单计算器程序

＃include＜stdio．h＞／／计算器

voidmenu（）／／自定义的菜单界面

｛

printf（＂－－－－－－－－－－－－－－－－－－－－＼n＂）；

printf（＂请输入你的选择＼n＂）；

printf（＂1．＋＼n＂）；

printf（＂2．－＼n＂）；

printf（＂3．＊＼n＂）；

printf（＂4．／＼n＂）；

printf（＂－－－－－－－－－－－－－－－－－－－－＼n＂）；

｝

intmain（）

｛

inti＝0；

intj＝0；

intnum＝0；／／计算结果存放在nun

intselect＝0；／／选择的选项存放在select

do／／do－while先执行再判断循环条件，即可实现重复计算功能

｛

menu（）；／／打印出菜单界面

scanf（＂％d＂，＆select）；／／输入你的选项

printf（＂请输入计算值：＂）；

scanf（＂％d％d＂，＆i，＆j）；／／输入要计算的数值

switch（select）

｛

case1：

printf（＂％d＋％d＝％d＼n＂，i，j，num＝i＋j）；／／实现加法功能

break；

case2：

printf（＂％d－％d＝％d＼n＂，i，j，num＝i－j）；／／实现减法功能

break；

case3：

printf（＂％d＊％d＝％d＼n＂，i，j，num＝i＊j）；／／实现乘法功能

break；

case4：

printf（＂％d－％d＝％d＼n＂，i，j，num＝i／j）；／／实现除法功能

break；

default：

printf（＂输入有误重新选择＂）；

break；

｝

｝while（select）；

return0；

｝

运行结果：

扩展资料：

return表示把程序流程从被调函数转向主调函数并把表达式的值带回主调函数，实现函数值的返回，返回时可附带一个返回值，由return后面的参数指定。

return通常是必要的，因为函数调用的时候计算结果通常是通过返回值带出的。如果函数执行不需要返回计算结果，也经常需要返回一个状态码来表示函数执行的顺利与否（-1和0就是最常用的状态码），主调函数可以通过返回值判断被调函数的执行情况。

网站标题：c语言用函数写一个运算器 c语言用函数编写计算器
标题网址：http://kswjz.com/article/ddgpcie.html