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stack.php
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<?php
if(session_status()==PHP_SESSION_NONE)
{
session_start();
if(!isset($_SESSION['username']))
{
header("Location: index.php");
exit;
}
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="css/Semantic/semantic.min.css">
<script src="js/jquery-3.4.1.min.js"></script>
<script src="css/Semantic/semantic.min.js"></script>
<script src="js/script.js"></script>
<script src="js/questions.js"></script>
<link rel="stylesheet" href="css/home.css">
<link rel="icon" href="images\dscelogo.png">
<title>Stack Operations</title>
</head>
<body>
<h1 class="ui header" style="text-align:center" id = "head">
<a class="ui circular image" href="http://dsce.edu.in"><img src="images/dscelogo.jpg"></a>
<a href="titles.php">Virtual Labs</a>
</h1>
<div id="toTop"><i class="chevron up icon"></i></div>
<div>
<div class="ui light grey inverted secondary huge menu">
<a class="header item" href="index.php">
Home
</a>
<a class="item" href="datastructures.php">
Data Structures
</a>
<a class="item">
About Us
</a>
<?php
if(!isset($_SESSION["username"])) echo "<a class=\"item\" href=\"login.php\">Login</a><a class=\"item\" href=\"register.php\">Register</a>";
else
{
echo "<a class=\"item\">";
echo $_SESSION['username'];
echo "</a><a class=\"item\" href=\"logoutprocess.php\">Logout</a>";
}
?>
</div>
</div>
<div class="ui container" id="cont">
<h2 class="ui header" style="font-size:35px; margin-left:10px;">
Operations on Stack
</h2>
<div class="ui stackable grid">
<div class="four wide column">
<div class="ui secondary vertical pointing menu" id="Menus">
<a class="active item" id="intro">
Introduction
</a>
<a class="item" id="prereq">
Theory
</a>
<a class="item" target="_blank" id="list">
Compiler
</a>
<a class="item" id="faq">
Quiz
</a>
</div>
</div>
<div class="twelve wide stretched column">
<div class="ui segment">
<div id="int">
Stack is a linear data structure which follows a particular order in which the operations are performed. The order may be LIFO(Last In First Out) or FILO(First In Last Out).
<br><br>
<iframe height="400px" width="100%" allowfullscreen="allowfullscreen" src="https://www.youtube.com/embed/d_ryNeRGD8U" frameborder="0">
</iframe>
<br><br>
There are many real-life examples of a stack. Consider an example of plates stacked over one another in the canteen. The plate which is at the top is the first one to be removed, i.e. the plate which has been placed at the bottommost position remains in the stack for the longest period of time. So, it can be simply seen to follow LIFO(Last In First Out)/FILO(First In Last Out) order.
</div>
<div id="pre" style="display: none;">
<div class="ui bulleted list">
<div class="item">
Stack is a linear data structure which follows a particular order in which the operations are performed. The order may be LIFO(Last In First Out) or FILO(First In Last Out).
Mainly the following three basic operations are performed in the stack:<br><br>
<div class="GrayBlock">
<div class="item"><strong>Push:</strong> Adds an item in the stack. If the stack is full, then it is said to be an Overflow condition. (Insert)</div>
<div class="item"><strong>Pop:</strong> Removes an item from the stack. The items are popped in the reversed order in which they are pushed. If the stack is empty, then it is said to be an Underflow condition. (Delete)</div>
<div class="item"><strong>Display:</strong> Displays the content of the stack.</div>
</div></div>
<br>
<img id="theoryImage" src="images/stack.png">
<br>
<div class="item">
Stacks are implemented using arrays or Linked Lists. Stacks are Easy to implement and Memory is saved as pointers are not involved. But, it is not dynamic. It doesn’t grow and shrink depending on needs at runtime.
</div>
</div>
<br>
</div>
<div id="lis" style="display: none;">
<div class="ui form">
<div id="compilerData">
Write a program in C to simulate the working of a stack of integers using an array. Provide the following operations:<br>
a. Insert<br> b. Delete<br> c. Display.<br><br>
<strong>Input Format:</strong><br>
Every line consists of one argument, a character. If the character is 'a', the next argument is an integer.<br>
The Character denotes the operation. 'a' is to Insert, 'b' is to Delete, and 'c' is to Display.<br>
The Integer denotes the value to Insert into the stack.<br>
Note: The program ends only when a character which is not any of the above options is entered.<br><br>
<strong>Output Format:</strong><br>
Print one/more array of integers, denoting the composition of the stack.<br>
</div><br>
<div class="ui segment">
<div class="ui two column very relaxed grid">
<div class="column">
<strong>Sample Input</strong><br>
a 5<br>a 8<br>c<br>b<br>a 7<br>c<br>q
</div>
<div class="column">
<strong>Sample Output</strong><br>
8 5 <br>7 5 <br>
</div>
</div>
<div class="ui vertical divider">and</div>
</div>
</div><br>
<form action="compile.php" id="form" name="f2" method="POST" ><br>
<label class="writeCode">Write Your Code</label><br><br>
<!-- <div class="ui large segment" id="editor" style="height:500px;"> -->
<!-- <textarea class="field codeBlock" id="editor" name="code" rows="10" cols="50">
#include<stdio.h>
void main()
{
}</textarea><br><br> -->
<div class="ui large segment" style="height:500px;">
<div id="editor">/*Type your code here: */
#include<stdio.h>
void main()
{
}
</div>
</div>
<div>
<textarea name="editor" style="display: none;" >
</div>
<textarea style="display: none;"></textarea>
<button class="ui left floated button" onclick="myFunction()">Custom Input</button>
<div id="inputs" style="display:None;">
<br><br>
<label for="in" class="writeCode"><br>Enter Your Input</label><br><br>
<textarea class="field codeBlock" name="input" rows="10" cols="50"></textarea><br><br><br>
</div>
<input type="hidden" name="extra" value="Content of the extra variable" >
<input type="hidden" name="lang" value="c" >
<input type="hidden" name="prog" value="stack" >
<input type="submit" id="st" class="ui left floated button" value="Run Code" onclick="myFunction2()">
<input type="submit" id="subb" class="ui left floated button" value="Submit" onclick="myFunction2()"><br><br><br>
</form><br>
<div id="outputBox" style="display:None;">Output:<br><br>
<div name="output"></div><br>
</div>
</div>
</div>
<div id="faqs" style="display: none;">
<form name="quiz" id="quiz" action="quizProcess.php" method="POST">
<?php
$servername = "localhost:3306";
$db_username = "root";
$password = "1234";
$dbname = "virtuallabsdsce";
// Create connection
$conn = new mysqli($servername, $db_username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$usn=$_SESSION["usn"];
$query = "select * from user_scores where usn='$usn' and topic_name='st'";
$res=$conn->query($query);
if ($res->num_rows == 1)
{
$row = $res->fetch_assoc();
echo "Quiz already attemped!<br><br>Your score: ".$row["quiz_score"];
}
else{
$a= [1,2,3,4,5,6,7,8];
$opt = ['a','b','c','d'];
$questionno = 1;
shuffle($a);
foreach($a as $i)
{
$query = "select question from questions_ds where question_no like \"st$i\"";
$question_name = $conn->query($query);
$row = $question_name->fetch_assoc();
echo "<p>".$questionno.". ".$row['question']."<br>";
shuffle($opt);
foreach($opt as $j)
{
$option_name = $conn->query("select options_name from answer_ds where option_no like \"st$i$j\"");
$row =$option_name->fetch_assoc();
echo "<label><input type=\"radio\" name=\"st".$i."\" value=\"st".$i.$j."\">".$row['options_name']."</label><br>";
}
echo "<span id=\"st".$i."\"></span></p><br>";
$questionno += 1;
}
echo "<input type=\"hidden\" name=\"quizID\" value=\"ds.st.8\">";
echo "<div id=\"result\"><input type=\"submit\" id=\"quizSub\" class=\"ui left floated button\" value=\"Submit\"></div>";
}
$conn->close();
?>
</form>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.3.3/ace.js" type="text/javascript" charset="utf-8"></script>
<script>
var editor = ace.edit("editor");
editor.setTheme("ace/theme/twilight");
editor.session.setMode("ace/mode/c_cpp");
var textarea = $('textarea[name="editor"]');
editor.getSession().on("change", function () {
textarea.val(editor.getSession().getValue());
});
// function getcodeVal(){
// var code = editor.getValue();
// console.log(code);
// }
</script>
</body>
</html>