PHP实现简单计算器程序代码
要实现计算器我们可以利用php中相关数学操作函数及相关数组来进行操作了,这个个人只是好玩写的并且无实用,计算器个人觉得js的最好.
php计算器,代码如下:
<html> <head> <title>PHP实现简单计算器</title> <meta http-equiv= "Content-Type" content= "text/html;charset=gb2312" > </head> <?php $num1 =true; $num2 =true; $numa =true; $numb =true; $message = "" ; //单路分支 if (isset( $_GET [ "sub" ])){ if ( $_GET [ "num1" ]== "" ){ $num1 =false; $message .= "第一个数不能为空" ; } if (! is_numeric ( $_GET [ "num1" ])){ $numa =false; $message .= "第一个数不是数字" ; } if ( $_GET [ "num2" ]== "" ){ $num2 =false; $message .= "第二个数不能为空" ; } if (! is_numeric ( $_GET [ "num2" ])){ $numb =false; $message .= "第二个数不是数字" ; } if ( $num1 && $num2 && $numa && $numb ) { $sum =0; //多路分支switch switch ( $_GET [ "ysf" ]){ case "+" : $sum = $_GET [ "num1" ]+ $_GET [ "num2" ]; break ; case "-" : $sum = $_GET [ "num1" ]- $_GET [ "num2" ]; break ; case "x" : $sum = $_GET [ "num1" ]* $_GET [ "num2" ]; break ; case "/" : $sum = $_GET [ "num1" ]/ $_GET [ "num2" ]; break ; case "%" : $sum = $_GET [ "num1" ]% $_GET [ "num2" ]; break ; } } } ?> <br /><b>Notice</b>: Undefined index: num1 in <b> D:\php\PHPnow1.5.5\Package\vhosts\127.0.0.1\ceshi\jsq.php</b> on line <b>64</b><br /> <body> <table align= "center" border= "1" width= "500" > <caption><h1>计算器</h1></caption> <form action= "jsq.php" > <tr> <td> <input type= "text" size= "5" name= "num1" value= "<?php echo $_GET[" num1 "] ?>" > </td> <td> <select name= "ysf" > <option value= "+" <?php if ( $_GET [ "ysf" ]== "+" ) echo "selected" ?>>+</option> <option value= "-" <?php if ( $_GET [ "ysf" ]== "-" ) echo "selected" ?>>-</option> <option value= "x" <?php echo $_GET [ "ysf" ]== "x" ? "selected" : "" ?>>x</option> <option value= "/" <?php echo $_GET [ "ysf" ]== "/" ? "selected" : "" ?>>/</option> <option value= "%" <?php echo $_GET [ "ysf" ]== "%" ? "selected" : "" ?>>%</option> </select> </td> <td> <input type= "text" size= "5" name= "num2" value= "<?php echo $_GET[" num2 "] ?>" > </td> <td> <input type= "submit" name= "sub" value= "计算" > </td> </tr> <?php if (isset( $_GET [ "sub" ])){ echo '<tr><td colspan="5">' ; if ( $num1 && $num1 && $numa && $numb ){ echo "结果：" . $_GET [ "num1" ]. " " . $_GET [ "ysf" ]. " " . $_GET [ "num2" ]. " = " . $sum ; } else { echo $message ; } echo '</td></tr>' ; } ?> </form> </table> </body> </html>js计算器,代码如下:
<html> <head> <title>计算器</title> <script> <!-- willclear= false //这个变量作为下一次输入是否先清空输入框的状态标志 function backspace(){ //退格 Calc.Input.value = Calc.Input.value.substring(0,Calc.Input.value.length-1) Calc.Input.title = Calc.Input.value.substring(0,Calc.Input.title.length-1) } //取长度为原长度减一的串，实现退格效果。 function addoperator(){ //加操作符 if (willclear){ //如果这次输入前需要清空输入框 willclear= false //先清除标志，避免下次再次被错误地重复清空 clearinput() //清除输入内容 } Calc.Input.value += event.srcElement.innerText //给用于显示的加上刚输入的运算符 Calc.Input.title += event.srcElement.name //给用于计算的表达式区加上刚输入的运算符 } function clearinput(){ //清除输入 Calc.Input.value= '' //清空显示区 Calc.Input.title= '' //清空表达式 } function result(){ //用于计算结果 Calc.Input.value = eval(Calc.Input.title) //执行表达式区的表达式，返回结果到显示区。 willclear= true //设定下次按键则先清除此次计算结果。 } //--> </script> <style> button {width:40; border: 1 solid #808080;background-color: #FFFFFF} </style> </head> <body> <FORM NAME= "Calc" > <TABLE BORDER=4 bordercolorlight= "#808080" bordercolor= "#808080" width= "250" height= "38" ><TR><TD width= "291" height= "39" bgcolor= "#C0C0C0" > <INPUT TYPE= "text" NAME= "Input" readonly Size= "21" style= "background-color: #F5F5F5; font-family: Arial; border: 1 solid #000000" >  <button NAME= "back" OnClick= "backspace()" >←</button> </TD></TR><TR><TD width= "291" height= "38" > <table border= "0" width= "100%" height= "105" cellpadding= "0" > <tr> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "1" OnClick= "addoperator()" >1</BUTTON> </td> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "2" OnClick= "addoperator()" >2</BUTTON> </td> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "3" OnClick= "addoperator()" >3</BUTTON> </td> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "+" OnClick= "addoperator()" >+</BUTTON> </td> </tr> <tr> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "4" OnClick= "addoperator()" >4</BUTTON> </td> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "5" OnClick= "addoperator()" >5</BUTTON> </td> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "6" OnClick= "addoperator()" >6</BUTTON> </td> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "-" OnClick= "addoperator()" >-</BUTTON> </td> </tr> <tr> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "7" OnClick= "addoperator()" >7</BUTTON> </td> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "8" OnClick= "addoperator()" >8</BUTTON> </td> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "9" OnClick= "addoperator()" >9</BUTTON> </td> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "*" OnClick= "addoperator()" >×</BUTTON> </td> </tr> <tr> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "clear" OnClick= "clearinput()" >C</BUTTON> </td> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "0" OnClick= "addoperator()" >0</BUTTON> </td> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "=" OnClick= "result()" >=</BUTTON> </td> <td width= "25%" height= "31" align= "center" bgcolor= "#C0C0C0" > <BUTTON NAME= "/" OnClick= "addoperator()" >÷</BUTTON> </td> </tr> </table> </TD></TR> </TABLE> </FORM> </body> </html>查看更多关于PHP实现简单计算器程序代码 - 综合实例的详细内容...
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