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Using PHP to implement a simple home-made calculator

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1<! DOCTYPE html>234<title>php Implementation Calculator </title>56     7<body>8<?PHP9             $mess= "";Ten             if(isset($_post["Sub"])){ One                 if($_post["num1"] = = ""){ A                     $mess. = "The first number cannot be empty!<br>"; -                 } -                 Else{ the                     if(!Is_numeric($_post["NUM1"])){ -                         $mess. = "The first number must be a digital!<br>"; -                     } -                 } +              -                 if($_post["Num2"]== ""){ +                     $mess. = "The second number cannot be empty!<br>"; A                 } at                 Else{ -                     if(!Is_numeric($_post["Num2"])){ -                         $mess. = "The second number must be a number!<br>"; -                     } -                     Else{ -                         if($_post["Opt"]== "/" &&$_post["Num2"]==0){ in                             $mess. = "Divisor cannot be 0"; -                         } to                     } +                 } -             } the?> *<table border= "1" align= "center" width= ">" $<form action= "" method= "POST" >Panax Notoginseng<caption> -<tr> the<td> +<input type= "Text" size= "4" name= "NUM1" value= "<?php Echo$_post["Num1"]?> "/> A</td> the              +<td> -<select name= "opt" > $<option value= "+" <?phpEcho $_post["opt"]== "+"? "Selected": "?>>+</option> $<option value= "-" <?phpEcho $_post["Opt"]== "-"? "Selected": "?>>-</option> -<option value= "x" <?phpEcho $_post["Opt"]== "x"? "Selected": "?>>x</option> -<option value= "/" <?phpEcho $_post["Opt"]== "/"?) "Selected": "?>>/</option> the<option value= "%" <?phpEcho $_post["opt"]== "%"? "Selected": "?>>%</option> -</select>Wuyi</td> the              -<td> Wu<input type= "Text" size= "4" name= "num2" value= "<?php Echo$_post["num2"]?> "/> -</td> About              $<td> -<input type= "Submit" Name= "sub" value= "Calculation"/> -</td> -</tr> A</form> +<?PHP the         if(isset($_post["Sub"])){ -             Echo' <tr><td colspan= ' 4 "> '; $             if(!$mess){ the                 $sum=0; the                 Switch($_post["Opt"]){ the                      Case"+": the                         $sum=$_post["NUM1"] +$_post["Num2"]; -                          Break; in                      Case"-": the                         $sum=$_post["NUM1"]-$_post["Num2"]; the                          Break; About                      Case"X": the                         $sum=$_post["NUM1"] *$_post["Num2"]; the                          Break; the                      Case"/": +                         $sum=$_post["NUM1"]/$_post["Num2"]; -                          Break; the                      Case"%":Bayi                         $sum=$_post["NUM1"]%$_post["Num2"]; the                          Break; the                 } -                  -                 Echo"Result: {$_post[' Num1 ']} {$_post[' Opt ']} {$_post[' Num2 ']} = {$sum}"; the             } the             Else{ the                 Echo $mess; the             } -             Echo' </td></tr> '; the         } the?> the</table>94</body> the
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Using PHP to implement a simple home-made calculator

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