一个简单的计算器！ — 编程爱好者社区

主题：一个简单的计算器！

不游泳的鱼 [专家分：620] 发布于 2004-05-15 17:08:00

#include<math.h>
#include<stdlib.h>
#include<iostream.h>
class Calculator
{
    double a,b;
public:
    Calculator(){a=0;b=0;}; //could be omitted
    void newa()
    {
        double num;
        cout<<"Input the number:";
        cin>>num;
        a=num;
    }
    void newab()
    {
        double num1,num2;
        cout<<"Input the numbers.the first number:";
        cin>>num1;
        cout<<"Input the senond number:";
        cin>>num2;
        a=num1;
        b=num2;
    }
    double Geta(){return a;}
    double Getb(){return b;}
    double Add(Calculator &A);
    double Sub(Calculator *A);
    double Mul(Calculator &A);
    double Div(Calculator &A);
    double Sin(Calculator &A);
    double Cos(Calculator &A);
    double Tan(Calculator &A);
    double Exp(Calculator &A);
    double Fabs(Calculator &A);
    double LogE(Calculator &A);
    double Log10(Calculator &A);
    double Pow(double x,double y);
    double Sqrt(double x);
};
double Calculator::Add(Calculator &A)
{
    return A.a+A.b;
}
double Calculator::Sub(Calculator *A)
{
    return A->a-A->b;
}
double Calculator::Mul(Calculator &A)
{
    return A.a*A.b;
}
double Calculator::Div(Calculator &A)
{
    if(A.b==0)
    {cout<<"Error! The program will be terminated!"<<endl;exit(0);}
    return A.a/A.b;
}
double Calculator::Sin(Calculator &A)
{
    return sin(A.a);
}
double Calculator::Cos(Calculator &A)
{
    return cos(A.a);
}
double Calculator::Tan(Calculator &A)
{
    return tan(A.a);
}
double Calculator::Exp(Calculator &A)
{
    return exp(A.a);
}
double Calculator::Fabs(Calculator &A)
{
    return fabs(A.a);
}
double Calculator::LogE(Calculator &A)
{
    return log(A.a);
}
double Calculator::Log10(Calculator &A)
{
    return log10(A.a);
}
double Calculator::Pow(double x,double y)
{
    return pow(x,y);
}
double Calculator::Sqrt(double x)
{
    if(x<0)
    {cout<<"Error! The program will be terminated!"<<endl;exit(0);}
    return sqrt(x);
}

void main()
{
    int sel;
    Calculator cal;
    cout<<"Welcome to use the calculator!please select."<<endl;
    cout<<"1:\'+\'    2:\'-\'     3:\'*\'      4:\'/\'     5:\'sin\'   6:\'cos\'  7:\'tan\'"<<endl;
    cout<<"8:\'exp\'  9:\'fabs\'  10:\'logE\'  11:\'log10\' 12:\'pow\'  13:\'sqrt\'"<<endl;
    do
    {
    cout<<"Please select:(0--exit)";
    cin>>sel;
    switch (sel)
    {
    case 0: break;
    case 1: cal.newab();
            cout<<"The result is:"<<cal.Add(cal)<<endl;
            break;
    case 2: cal.newab();
            cout<<"The result is:"<<cal.Sub(&cal)<<endl;
            break;
    case 3: cal.newab();
            cout<<"The result is:"<<cal.Mul(cal)<<endl;
            break;
    case 4: cal.newab();
            cout<<"The result is:"<<cal.Div(cal)<<endl;
            break;
    case 5: cal.newa();
            cout<<"The result is:"<<cal.Sin(cal)<<endl;
            break;
    case 6: cal.newa();
            cout<<"The result is:"<<cal.Cos(cal)<<endl;
            break;
    case 7: cal.newa();
            cout<<"The result is:"<<cal.Tan(cal)<<endl;
            break;
    case 8: cal.newa();
            cout<<"The result is:"<<cal.Exp(cal)<<endl;
            break;
    case 9: cal.newa();
            cout<<"The result is:"<<cal.Fabs(cal)<<endl;
            break;
    case 10: cal.newa();
            cout<<"The result is:"<<cal.LogE(cal)<<endl;
            break;
    case 11: cal.newa();
            cout<<"The result is:"<<cal.Log10(cal)<<endl;
            break;
    case 12: cal.newab();
            cout<<"The result is:"<<cal.Pow(cal.Geta(),cal.Getb())<<endl;
            break;
    case 13: cal.newa();
            cout<<"The result is:"<<cal.Sqrt(cal.Geta())<<endl;
            break;
    default: cout<<"Your selection is ERROR! Select again!"<<endl;
    }
    }while(sel!=0);
}
本人水平有限！有错误请指正！谢谢

本帖地址： http://bbs.pfan.cn/post/37675.html

回复列表（共17个回复）

沙发

xyz1 [专家分：0] 发布于 2004-05-15 11:56:00

我很想向你学习.请多指教!!

板凳

有事找我请烧钱 [专家分：500] 发布于 2004-05-15 12:49:00

这个程序是不是有点复杂化呢？

3 楼

jywzzz [专家分：1020] 发布于 2004-05-15 13:39:00

输入和输出有点复杂。不过毕竟是dos下的i/o啊，呵呵，我抄的一个html计数器。
大家可以看看，用的javascript。

<html>
<head><title>科学计数器</title>
<script language="javascript">
r=new Array(2);
function initialize(){
  currOper="start";
  r[0]="0";
  r[1]="0";
  operand="";
  ix=0;
}
function addDigit(n){
  if(currOper=="Int" || currOper=="Float")
    r[ix]=appendDigit(r[ix],n)
  else{
    r[ix]=""+n;
    currOper="Int";
  }
  showinForm(r[ix]);
}
function appendDigit(n1,n2){
  if(n1=="0")
    return ""+n2;
  var s="";
  s+=n1;
  s+=n2;
  return s;
}
function showinForm(s){
  document.calculator.total.value=s;
}
function addDecimalPoint(){
  if(currOper!="Float"){
    decimal=true;
    r[ix]+=".";
    if(currOper=="Operator" || currOper=="getoperand")
      r[ix]="0."
    currOper="Float";
    showinForm(r[ix]);
  }
}
function clearDisplay(){
  initialize();
  showinForm(r[0]);
}
function changeSign(){
  if(r[ix].charAt(0)=="-")
    r[ix]=r[ix].substring(1,r[ix].length);
  else if(parseFloat(r[ix])!=0)
    r[ix]="-"+r[ix];
  showinForm(r[ix]);
}
function setTo(n){
  r[ix]=""+n;
  currOper="Operator";
  decimal=false;
  showinForm(r[ix]);
}
function Count(){
  if(currOper=="Int" || currOper=="Float" || currOper=="Operator"){
    if(ix==1){
      r[0]=doCounting(operand,r[0],r[1]);
      ix=0;
    }
  }
  else if(currOper=="getoperand2"){
    r[0]=doCounting(operand,r[1],r[0]);
    ix=0;
  }
  currOper="Operator";
  decimal==false;
  showinForm(r[ix]);
}
function doCounting(op,x,y){
  var result="";
  switch(op){
    case "+":result=""+(parseFloat(x)+parseFloat(y));break;
    case "-":result=""+(parseFloat(x)-parseFloat(y));break;
    case "*":result=""+(parseFloat(x)*parseFloat(y));break;
    case "/":if(parseFloat(y)==0){
               alert("分子为0，错误！");
               result=0;
             }
             else result=""+(parseFloat(x)/parseFloat(y));
             break;
  }
  return result;
}
function performOp(op){
  if(currOper=="start"){
    ++ix;
    operand=op;
  }
  else if(currOper=="Int" || currOper=="Float" || currOper=="Operator"){
    if(ix==0){
      ++ix;
      operand=op;
    }
    else{
      r[0]=doCounting(operand,r[0],r[1]);
      showinForm(r[0]);
      operand=op;
    }
  }
  currOper="getoperand2";
  decimal=false;
}
function doFunction(){
  var selectionList=document.calculator.functions;
  var selIX=selectionList.selectedIndex;
  var sel=selectionList.options[selIX].value;
  switch(sel){
    case"abs":r[ix]=Math.abs(r[ix]);break;
    case"acos":r[ix]=Math.acos(r[ix]);break;
    case"asin":r[ix]=Math.asin(r[ix]);break;
    case"atan":r[ix]=Math.atan(r[ix]);break;
    case"ceil":r[ix]=Math.ceil(r[ix]);break;
    case"cos":r[ix]=Math.cos(r[ix]);break;
    case"exp":r[ix]=Math.exp(r[ix]);break;
    case"floor":r[ix]=Math.floor(r[ix]);break;
    case"log":r[ix]=Math.log(r[ix]);break;
    case"sin":r[ix]=Math.sin(r[ix]);break;
    case"sqrt":r[ix]=Math.sqrt(r[ix]);break;
    case"tan":r[ix]=Math.tan(r[ix]);break;
  }
  decimal=false;
  showinForm(r[ix]);
}
</script>
</head>
<body>
<script language="javascript">
initialize();
</script>
<h1><center>JYWZZZ.K做的计数器</h1>
<form name="calculator">
<table border="border" align="center">
<tr>
<td colspan="6">
<input type="text" name="total" value="0" size=44></td>
</tr>
<tr>
<td><input type="button" name="n1" value="1" onclick="addDigit(1)"></td>
<td><input type="button" name="n2" value="2" onclick="addDigit(2)"></td>
<td><input type="button" name="n3" value="3" onclick="addDigit(3)"></td>
<td><input type="button" name="plus" value="+" onclick="performOp('+')"></td>
<td colspan=1><input type="button" name="clearField" value="清除" onclick="clearDisplay()"></td>
<td colspan=1><input type="button" name="ln2" value="ln2" onclick="setTo(Math.LN2)"</td>
</tr>
<tr>
<td><input type="button" name="n4" value="4" onclick="addDigit(4)"></td>
<td><input type="button" name="n5" value="5" onclick="addDigit(5)"></td>
<td><input type="button" name="n6" value="6" onclick="addDigit(6)"></td>
<td><input type="button" name="minus" value="-" onclick="performOp('-')"></td>
<td colspan=1><input type="button" name="sqrt(2)" value="sqrt(2)" onclick="setTo(Math.SQRT2)"></td>
<td colspan=1><input type="button" name="ln10" value="ln10" onclick="setTo(Math.LN10)"</td>
</tr>
<tr>
<td><input type="button" name="n7" value="7" onclick="addDigit(7)"></td>
<td><input type="button" name="n8" value="8" onclick="addDigit(8)"></td>
<td><input type="button" name="n9" value="9" onclick="addDigit(9)"></td>
<td><input type="button" name="multiply" value="*" onclick="performOp('*')"></td>
<td colspan=1><input type="button" name="sqrt(1/2)" value="sqrt(1/2)" onclick="setTo(Math.SQRT1_2)"></td>
<td colspan=1><input type="button" name="log2e" value="log2(e)" onclick="setTo(Math.LOG2E)"</td>
</tr>
<tr>
<td><input type="button" name="n0" value="0" onclick="addDigit(0)"></td>
<td><input type="button" name="decimal" value="." onclick="addDecimalPoint()"></td>
<td><input type="button" name="sign" value="+/-" onclick="changeSign()"></td>
<td><input type="button" name="divide" value="/" onclick="performOp('/')"></td>
<td colspan=1><input type="button" name="random" value="random" onclick="setTo(Math.random())"></td>
<td colspan=1><input type="button" name="log10e" value="log10(e)" onclick="setTo(Math.LOG10E)"</td>
</tr>
<tr>
<td colspan=1 rowspan=1><input type="button" name="pi" value="pi" onclick="setTo(Math.PI)"</td>
<td colspan=1 rowspan=1><input type="button" name="equal" value="=" onclick="Count()"></td>
<td colspan=1 rowspan=1><input type="button" name="e" value="e" onclick="setTo(Math.E)"></td>
<td colspan=3 rowspan=1><b>函数：</b><select name="functions" size=1>
<option value="abs" selected>abs(x)</option>
<option value="acos">acos(x)</option>
<option value="asin">asin(x)</option>
<option value="atan">atan(x)</option>
<option value="ceil">ceil(x)</option>
<option value="cos">cos(x)</option>
<option value="exp">exp(x)</option>
<option value="floor">floor(x)</option>
<option value="log">log(x)</option>
<option value="sin">sin(x)</option>
<option value="sqrt">sqrt(x)</option>
<option value="tan">tan(x)</option>
</select>
<input type="button" name="apply" value="应用" onclick="doFunction()"></td>
</tr>
</table>
</form>
</body>
</html>

复制后存到一个*.htm文件，然后双击就可以打开了。

4 楼

zhangbaolong [专家分：0] 发布于 2004-05-16 04:48:00

[b]你好[/b][font=隶书][/font][size=5][/size][color=00FF00] [/color]实际上我并不会编程，但我很喜欢它。我爱好它。希望大家能帮帮我。

5 楼

jiali [专家分：0] 发布于 2004-05-16 10:32:00

那么复杂啊。。。我自己就是学计算机的，都不会啊。。怎么办？

6 楼

songxun [专家分：70] 发布于 2004-05-16 10:34:00

[em1]兄弟
你做的就是太好拉

7 楼

songxun [专家分：70] 发布于 2004-05-16 10:36:00

[em1]哥们
做的好啊

8 楼

小菜妹 [专家分：0] 发布于 2004-05-16 11:39:00

能不能给我一个通过编译恶毒复数四则运算的c程序??/不胜感激

9 楼

jakemanse [专家分：30] 发布于 2004-05-18 12:55:00

编的还不错，就是对于俺这个菜鸟来说真是一个难题啊，希望大哥们能多多指教啊！！俺的QQ是６６７４０１６３．

10 楼

heason [专家分：0] 发布于 2004-05-22 20:23:00

总体的算法思想不错
但我想用运算符重载更好一点

我来回复

您尚未登录，请登录后再回复。点此登录或注册

主题：一个简单的计算器！

回复列表（共17个回复）

我来回复

程序员工具箱 new

代码片段

本版新帖

主题：一个简单的计算器！

回复列表 （共17个回复）

我来回复

程序员工具箱 new

代码片段

本版新帖

回复列表（共17个回复）