i creating calculator on web challenge ability think challenge creative edge , got basics down works issue having error displaying whem there no error displays when page loads , displays value when calculator used can please help?
<?php $value1 = $_post['value1']; $symbol = $_post['operator']; $value2 = $_post['value2']; $nulr = "nulrl"; if($nulr === "nulrl"){ if($symbol === "+"){ $output = $value1 + $value2; } elseif($symbol === "-"){ $output = $value1 - $value2; } elseif($symbol === "/"){ $output = $value1 / $value2; } elseif($symbol === "*"){ $output = $value1 * $value2; } else{ $output = "error not perform operation"; } } echo $output; ?> edit here html code
<!doctype html> <html lang="en"> <head> <title>the calculator</title> <meta charset="utf-8"> <link rel="stylesheet" href="styles.css"> </head> <body> <header> <h1>the goal</h1> <p>through studies of coding languages have come realize every coding langauage no matter how different syntax can handle user input , variables , produce , output. being said wanna make interactive calculator each coding language , advance on each 1 , see language can produce best calculator!</p> <main> <h2>php calculator</h2> <form method="post"> <input type="number" name="value1" value="value1" class="number-box"> <br> <select name="operator"> <option value="+">+</option> <option value="-">-</option> <option value="*">*</option> <option value="/">/</option> </select> <br> <input type ="number" name="value2" value="value2" class="number-box"> <br> <input type ="submit" name="submit" class="submit-button"> </form> <?include("calculator.php")?> <footer> <h3>comment box</h3> <form method="post" action="comment.php"> <input type="text" value="name" name="name"> <br> <textarea name="comment">comments</textarea> <input type="submit" name="submit" class="submit-button"> </form> <?php echo file_get_contents("comments.txt"); ?> </footer> </main> </header>
edit: still have not recieved correct answers
the simplest way:
<?php if(isset($_post['value1']){ //....... else{ $output = ''; echo "error, not perform operation"; } } echo $output; } ?> 
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