编写一个能够进行四则运算的程序

以下代码可以给你实现两个数的 四则运算..非常方便而且简单.你复制下研究吧.

'事先定义一个运算函数

Private Function YunSuan(S1 As Long, FuHao As String, S2 As Long, JieGuo) As Long

Select Case FuHao

Case "+"

JieGuo = S1 + S2

Case "-"

JieGuo = S1 - S2

Case "*"

JieGuo = S1 * S2

Case "/"

JieGuo = S1 / S2

Case Else

MsgBox "错误的运算符,请检查"

End Select

End Function

Private Sub Form_Click()

YunSuan 50, "+", 50, JieGuo '加法运算

MsgBox "50+50=" &JieGuo

YunSuan 50, "-", 50, JieGuo '减法运算

MsgBox "50-50=" &JieGuo

YunSuan 50, "*", 50, JieGuo '乘法运算

MsgBox "50*50=" &JieGuo

YunSuan 50, "/", 50, JieGuo '除法运算

MsgBox "50/50=" &JieGuo

End Sub

import java.text.DecimalFormat

import java.util.Scanner

public class Zhidao {

public static void main(String[] args) {

String condition = ""

Zhidao zhidao = new Zhidao()

do{

Scanner scanner = new Scanner(System.in)

try{

System.out.print("请输入第一个数：")

double x = scanner.nextDouble()

System.out.print("请输入第二个数：")

double y = scanner.nextDouble()

System.out.print("请输入运算符：")

String s = scanner.next()

char z = s.charAt(0)

zhidao.yunsuan(x, y, z)

}catch(Exception e){

System.out.println("请输入正确的数据！")

}

System.out.print("是否继续？continue：继续，任意字符：结束")

condition = scanner.next()

}while("continue".equals(condition))

}

public static void yunsuan(double x,double y,Character z){

DecimalFormat r=new DecimalFormat()

r.applyPattern("#0.00")

if(z.equals('+')){

System.out.println(x+"+"+y+"=" + r.format((x+y)))

} else if(z.equals('-')){

System.out.println(x+"-"+y+"=" + r.format((x-y)))

} else if(z.equals('*')){

System.out.println(x+"*"+y+"=" + r.format((x*y)))

} else if(z.equals('/')){

if(y==0){

System.out.println("被除数不能为0")

} else{

System.out.println(x+"/"+y+"=" + r.format((x/y)))

}

}else{

System.out.println("无法识别改运算符")

}

}

}

帮你做一下注释吧：

void Calculator()

{

float Result=0,Operater=0

char ch//把运算符号定义为ch

bool t=true//t=true时继续计算，出错时t=false

cout<<"\n"<<"Application Name"

cout<<"\n"<<"Used Method"

cout<<"\n"<<"Fabricator"

cout<<"\n"<<" User Input Program Output"

cout<<"\n"<<"============= ======================="

while(t) //当t为真时，继续计算

{

cin>>"ch">>Operater//输入运算符和数值，如+10

switch(ch) //根据符号判断进行何种运算

{

case '+' Result+=Operatercout<<"new Result is "<<Resultbreak

//+号就加上operator

case '-' Result-=Operatercout<<"new Result is "<<Resultbreak

//-号就减去operator

case '*' Result*=Operatercout<<"new Result is "<<Resultbreak

//*号就乘上operator

case '/' if(Operater==0)//是/号就要判断除数是否为0

//这里if后的括号里应是==而不是=

{cout<<"Error: attempt to divide by zero"break}

else{Result/=Operatercout<<"new Result is "<<Resultbreak}

case 'q' t=falsebreak//输入q则跳出本次运算

default cout<<"Error \'"<<ch<<"\' is not a valid operator\n"

//注意：""里的'应该用转义字符\'

}

}

}

另外，单词operater不存在，应作operator

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