calculatrice avec php

Bonjours tu semble a lire ce que tu as écris, débuter en HTML et encore plus en PHP 8O

Bien sur l'aide est toujour possible, mais il faut un minimum de bases,
dans ton exemple rien que le HTML parait douteux , balises P ouvertes et non fermées
TABLE ouvert mais aucune ligne ou colone définie bref comment veux tu de l'aide ? Va lire les bases HTML et PHP , ne t'en fait pas c' est abordable et tu progressera vite :D

Tiens je te donnes cette calculatrice TRES SOMMAIRE , et tu verra que malgrés cela c' est déjas dur dur ... :oops:

Alors bon courage et test cette calculatrice ...
Code:
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<?php
session_start();
/* ======= copyright http://www.php cs.com/ ========= */
?>
<html>
<head>
	<title>Calculatrice</title>
</head>
<body>
	<?php
		if (!isset($_SESSION["c"])) $_SESSION["c"]=""; 
		if (!isset($_SESSION["operateur"])) $_SESSION["operateur"]="="; 
		if (!isset($_SESSION["p"])) $_SESSION["p"]= 0;
		if (!isset($_SESSION["concat"])) $_SESSION["concat"]=FALSE;
		if (!isset($_SESSION['$id'])) $_SESSION['$id']=false;  
			function calcule($x,$op,$y)
				{
					switch($op)
						{
							case "+" : $res=$x+$y;break;
							case "-" : $res=$x-$y;break;
							case "*" : $res=$x*$y;break;
							case "/" : if($y==0)  $res=0; else $res=$x/$y;break;
							case "=" : $res=$y;break;
						}
					return $res;
				}
 
				$_SESSION["virgule"]=false;
 
				if (isset($_POST["cmd"])) 
					$cmd = trim($_POST["cmd"]); 
				else
					$cmd ="";
 
 
				switch($cmd) //or $_SESSION['c']<>0
					{
							case "0" : if ($_SESSION['$id'])
					{$_SESSION["c"]=$cmd;$_SESSION['$id']=false;}
					else
					$_SESSION["c"]=$_SESSION["c"].$cmd;
					break;
 
 
						case "0" : if ($_SESSION['$id'] )
							{$_SESSION["c"]=$cmd;$_SESSION['$id']=false;}
								   else
							$_SESSION["c"]=$_SESSION["c"].$cmd;
						break;
 
							case "1" : if ($_SESSION['$id'])
							{$_SESSION["c"]=$cmd;$_SESSION['$id']=false;}
							else
							$_SESSION["c"]=$_SESSION["c"].$cmd;
						break;
						case "2" : if ($_SESSION['$id'])
							{$_SESSION["c"]=$cmd;$_SESSION['$id']=false;}
							else
							$_SESSION["c"]=$_SESSION["c"].$cmd;
						break;
						case "3" : if ($_SESSION['$id'])
							{$_SESSION["c"]=$cmd;$_SESSION['$id']=false;}
									else
							$_SESSION["c"]=$_SESSION["c"].$cmd;
						break;
						case "4" : if ($_SESSION['$id'])
							{$_SESSION["c"]=$cmd;$_SESSION['$id']=false;}
									else
							$_SESSION["c"]=$_SESSION["c"].$cmd;
						break;
						case "5" : if ($_SESSION['$id'])
							{$_SESSION["c"]=$cmd;$_SESSION['$id']=false;}
							else
					$_SESSION["c"]=$_SESSION["c"].$cmd;
					break;
					case "6" : if ($_SESSION['$id'])
							{$_SESSION["c"]=$cmd;$_SESSION['$id']=false;}
								else
							$_SESSION["c"]=$_SESSION["c"].$cmd;
					break;
					case "7" : if ($_SESSION['$id'])
							{$_SESSION["c"]=$cmd;$_SESSION['$id']=false;}
							else
							$_SESSION["c"]=$_SESSION["c"].$cmd;
					break;
					case "8" : if ($_SESSION['$id'])
							{$_SESSION["c"]=$cmd;$_SESSION['$id']=false;}
								else
							$_SESSION["c"]=$_SESSION["c"].$cmd;
					break;
					case "9" : if ($_SESSION['$id'])
									{$_SESSION["c"]=$cmd;$_SESSION['$id']=false;}
								else
									$_SESSION["c"]=$_SESSION["c"].$cmd;
					break;
 
					case "+" :  $_SESSION["operateur"]="+";
					$_SESSION["p"]=$_SESSION["c"];
					$_SESSION['$id']=true;
					$_SESSION['concat']=false;
					break;
					case "-" :  $_SESSION["operateur"]="-";
					$_SESSION["p"]=$_SESSION["c"];
					$_SESSION['$id']=true;
					$_SESSION['concat']=false;
					break;
					case "*" :  $_SESSION["operateur"]="*";
					$_SESSION["p"]=$_SESSION["c"];
					$_SESSION['$id']=true;
					$_SESSION['concat']=false;
					break;
					case "/" :  $_SESSION["operateur"]="/";
					$_SESSION["p"]=$_SESSION["c"];
					$_SESSION['$id']=true;
					$_SESSION['concat']=false;
					break;
					case "=" :  $_SESSION["c"]=calcule($_SESSION["p"],$_SESSION["operateur"],$_SESSION["c"]);
					$_SESSION['$id']=true;
					$_SESSION['concat']=false;
					break;
					case "." :	if ($_SESSION['concat']==false)
						{
						$_SESSION["c"]=$_SESSION["c"] .".";
						$_SESSION['concat']=true;
						}
						break;
 
					case "c" :	session_destroy();
					$_SESSION["c"]="";
					break;
	} 
 
?>
 
<H1 align="center">Calculatrice en PHP</H1>
 
<table border="6" align="center">
<tr>
	<td>
<table>
<tr height="50">
	<td colspan="5" align="center" ><table border="1" width="100%" height="100%"><tr><td align="right"><?php echo $_SESSION["c"]; ?></td></tr></table></td>
</tr>
<form action="Calculatrice.php" method="post"> 
<tr>
	<td align="center"> <input type="submit" name="cmd" value="   7   "></td>
	<td align="center"> <input type="submit" name="cmd" value="   8   "></td>
	<td align="center"> <input type="submit" name="cmd" value="   9   "></td>
	<td align="center"> <input type="submit" name="cmd" value="   +   "></td>
</tr>
<tr>
	<td align="center"> <input type="submit" name="cmd" value="   4   "></td>
	<td align="center"> <input type="submit" name="cmd" value="   5   "></td>
	<td align="center"> <input type="submit" name="cmd" value="   6   "></td>
	<td align="center"> <input type="submit" name="cmd" value="   -   "></td>
</tr>
<tr>
	<td align="center"> <input type="submit" name="cmd" value="   1   "></td>
	<td align="center"> <input type="submit" name="cmd" value="   2   "></td>
	<td align="center"> <input type="submit" name="cmd" value="   3   "></td>
	<td align="center"> <input type="submit" name="cmd" value="   *   "></td>
</tr>
<tr>
	<td align="center"> <input type="submit" name="cmd" value="   0   "></td>
	<td align="center"> <input type="submit" name="cmd" value="   .    "></td>
	<td align="center"> <input type="submit" name="cmd" value="   =   "></td>
	<td align="center"> <input type="submit" name="cmd" value="   /   "></td>
</tr>
<tr>
	<td colspan="4" align="center" width="100%"> <input type="submit" name="cmd" value="                c                "></td>
</tr>
</table>
	</td>
</tr>
</table>
</form>
</body>
</html>