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php+html Implementing a Web page calculator

Source: Internet
Author: User
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<!--set the center alignment within the table, the table border 2px-->
<table align= "center" border= "2px" ><tr><td><input type= "text" name= "Number1" size=4></td ><td><select name= "Caculate" size= "1" ><option value= "+" >+</option><option value= "-" >-</option><option value= "*" >*</option><option value= "/" >/</option><option Value= "%" >%</option></select></td><td><input type= "text" name= "Number2" size=4> </td><td><input type= "Submit" Name= "OK" value= "calculation" size=4></td> </tr>

Set the first line (input line)

<TR align= "center" >
<!--colspan is used to merge cells to make the output data centered and more aesthetically pleasing. --><TD width= "full" colspan= "4" ><?phpfunction caculate ($numb 1, $numb 2, $method) {switch ($method) {case ' + ' : Return $numb 1+ $numb 2;break;case '-': return $numb 1-$numb 2;break;case ' * ': return $numb 1* $numb 2;break;case '/': return $ numb1/$numb 2;break;case '% ': return $numb 1% $numb 2;break;default:break;}} if (Isset ($_post[' OK ')) {$numb 1=$_post[' number1 '); $numb 2=$_post[' number2 ']; $method =$_post[' caculate '];if (is_ Numeric ($numb 1) &&is_numeric ($numb 2)) {if ($method = = '/' && $numb 2==0) {echo "<script>alert (' The divisor cannot be "0", please re-enter! </script> "; return;} $res =caculate ($numb 1, $numb 2, $method), echo "$numb 1 $method $numb 2 = $res";} Else{echo "<script>alert (' you entered not a number, please re-enter! ') </script> ";}}? ></td></tr>

Set second row (output line)

1<!doctype html>234<meta charset= "Utf-8" >5<title> Web Computers </title>67<style type= "Text/css" >8 h1{9Font-size=24px;TenText-align:Center; Onefont-family: "Blackbody" ; A     } -      -      the</style> -<body> - -<form method= "POST" > +<table align= "center" border= "2px" > -<tr> +<td> A<input type= "text" name= "Number1" size=4> at</td> -<td> -<select name= "Caculate" size= "1" > -<option value= "+" >+</option> -<option value= "-" >-</option> -<option value= "*" >*</option> in<option value= "/" >/</option> -<option value= "%" >%</option> to</select> +</td> -<td> the<input type= "text" name= "Number2" size=4> *</td> $<td>Panax Notoginseng<input type= "Submit" Name= "OK" value= "calculation" size=4> -</td> the</tr> +&LT;TR align= "center" > A&LT;TD width= "full" colspan= "4" > the<?PHP +                     functionCaculate ($numb 1,$numb 2,$method) -                     { $                         Switch($method) $                         { -                              Case' + ': -                                 return $numb 1+$numb 2; the                                  Break; -                              Case‘-‘:Wuyi                                 return $numb 1-$numb 2; the                                  Break; -                              Case‘*‘: Wu                                 return $numb 1*$numb 2; -                                  Break; About                              Case‘/‘: $                                 return $numb 1/$numb 2; -                                  Break; -                              Case‘%‘: -                                 return $numb 1%$numb 2; A                                  Break; +                             default: the                                  Break; -                         } $                     } the                     if(isset($_post[' OK '])) the                     { the                         $numb 1=$_post[' Number1 ']; the                         $numb 2=$_post[' Number2 ']; -                         $method=$_post[' Caculate ']; in                         if(Is_numeric($numb 1) &&Is_numeric($numb 2)) the                         { the                             if($method= = '/' &&$numb 2==0) About                             { the                                 Echo"<script>alert (' divisor cannot be" 0 ", please re-enter!) ') </script> "; the                                 return; the                             } +                             $res=caculate ($numb 1,$numb 2,$method); -                             Echo"$numb 1 $method $numb 2=$res"; the                         }Bayi                         Else the                         { the                             Echo"<script>alert (' you entered not a number, please re-enter!") ') </script> "; -                         } -                     } the?> the</td> the</tr> the</table> -</form> the      the</body> the
Full code
php+html Implementing a Web page calculator

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