DEV Community: bingchandler671

Double Free or Corruption error in C++

bingchandler671 — Thu, 26 Nov 2020 21:08:12 +0000

C++ programming language uses the free() function to “free” the run-time allocated in the memory of the operating system. Basically, the function reallocates more memory, other functions use that memory. The parameters in free function are null or block of memory allocated, and denoted by a pointer to a memory (ptr) block previously allocated with malloc, calloc or realloc. If ptr is null, the free( ) function does nothing else; Malloc, calloc and realloc allocate a memory block.

Cause

The double-free error occurs when free( ) is called over one time with the same memory. The program memory data structures become corrupted or altered, and an intruder like a hacker can write values in the memory spaces. A program can crash or alter execution flow.

Corruption (Fasttop) error happens when memory blocks allocated on the runtime or on the stack or workspace used to manage the heap. The error is hard to detect because the memory is valid for reading and writing unlike double free.

The memory corruption include

Register memory
user virtual memory

Solution

How to block someone on youtube from replying to your comments.

bingchandler671 — Thu, 26 Nov 2020 21:03:25 +0000

The user can disable replies to your Google+ posts and Youtube comments in your Google+ settings. The only tricky step is to make sure that you are updating the settings for Google+ profile or page connected to the channel that’s doing the commenting.

Steps to follow:

This functionality can be performed by the following steps;

1. Sign in to youtube channel:

Always sign in with the channel identity that you use to post comments. You can switch channel identities by clicking your avatar in the upper right corner and selecting a different channel.

2. Open the page connected to channel:

Click on the avatar in the upper right corner, then click your avatar a second time. That will open your channels profile page with you are acting as a manager.

3. Go to settings:

org.codeaurora.btmultisim

bingchandler671 — Thu, 26 Nov 2020 20:58:10 +0000

There are so many data file managers over there. On ios, AppStore and android google play store contains tons of the data managers. Many of them are provided by the authentic sources and contains many features. But on the ark side, there are many of the managers are corrupted and sending some data of your phone or keep track of your data by using these data managers.

Many corrupted data managers use the file making tactics for keeping a track record.

How it works?

→ The track of the files can be done by two types. Installing additional files into the platform. OR adding files or extracting constantly for hours and hours.

‘org.codeaurora.btmultisim’ is the most data corrupters are using. It is a file transfer protocol and contains the power of the tackle each anti corrupt software. It causes the overwhelming of the files of gigabytes in the pc or phones.

How to stay away?

How to get checked and unchecked checkbox array value in PHP?

bingchandler671 — Thu, 26 Nov 2020 20:56:58 +0000

This process has 5 steps
Step 1: For getting value of a checked checkbox
Code:

<form action="#" method="post">
<input type="checkbox" name="gender" value="Male">Male</input>
<input type="checkbox" name="gender" value="Female">Female</input>
<input type="submit" name="submit" value="Submit"/>
</form>
<?php
if (isset($_POST['gender'])){
echo $_POST['gender']; // Displays value of checked checkbox.
}
?>

Step 2: For getting values of multiple checked checkbox
Code:

<form action="#" method="post">
<input type="checkbox" name="check_list[]" value="C/C++"><label>C/C++</label><br/>
<input type="checkbox" name="check_list[]" value="Java"><label>Java</label><br/>
<input type="checkbox" name="check_list[]" value="PHP"><label>PHP</label><br/>
<input type="submit" name="submit" value="Submit"/>
</form>
<?php
if(isset($_POST['submit'])){//to run PHP script on submit
if(!empty($_POST['check_list'])){
// Loop to store and display values of individual checked checkbox.
foreach($_POST['check_list'] as $selected){
echo $selected."</br>";
}
}
}
?>

Step 3: php_checkbox.php (HTML code)
Code:

<!DOCTYPE html>
<html>
<head>
<title>PHP: Get Values of Multiple Checked Checkboxes</title>
<link rel="stylesheet" href="css/php_checkbox.css" />
</head>
<body>
<div class="container">
<div class="main">
<h2>PHP: Get Values of Multiple Checked Checkboxes</h2>
<form action="php_checkbox.php" method="post">
<label class="heading">Select Your Technical Exposure:</label>
<input type="checkbox" name="check_list[]" value="C/C++"><label>C/C++</label>
<input type="checkbox" name="check_list[]" value="Java"><label>Java</label>
<input type="checkbox" name="check_list[]" value="PHP"><label>PHP</label>
<input type="checkbox" name="check_list[]" value="HTML/CSS"><label>HTML/CSS</label>
<input type="checkbox" name="check_list[]" value="UNIX/LINUX"><label>UNIX/LINUX</label>
<input type="submit" name="submit" Value="Submit"/>
<!----- Including PHP Script ----->
<?php include 'checkbox_value.php';?>
</form>
</div>
</div>
</body>
</html>

Display html form values in same page after submit using javaScript

bingchandler671 — Thu, 26 Nov 2020 20:51:17 +0000

Method 1

<!DOCTYPE html>
<html>
  <head lang="en">
  <meta charset="UTF-8">
  <script language="JavaScript">
    function showInput() {
        document.getElementById('display').innerHTML = 
                    document.getElementById("user_input").value;
    }
  </script>

  </head>
<body>

  <form>
    <label><b>Enter a Message</b></label>
    <input type="text" name="message" id="user_input">
  </form>

  <input type="submit" onclick="showInput();"><br/>
  <label>Your input: </label>
  <p><span id='display'></span></p>
</body>
</html>

Another way you can do that. Point to be noted input type is button

<input type="button" onclick="showMessage()" value="submit" />

Follow this code:

<!DOCTYPE html>
<html>
<head>
    <title>HTML JavaScript output on same page</title>
    <script type="text/JavaScript">
        function showMessage(){
            var message = document.getElementById("message").value;
            display_message.innerHTML= message;
        }
    </script>
</head>
<body>
<form>
Enter message: <input type="text" id = "message">
<input type="button" onclick="showMessage()" value="submit" />
</form>
<p> Message is: <span id = "display_message"></span> </p>
</body>
</html>

MEthod 3

Unit Testing Technical Test & Interview Questions

bingchandler671 — Thu, 26 Nov 2020 18:04:56 +0000

The most frequently asked technical and Interview Questions regarding Unit Testing?

What does unit refer to in unit testing?
What is unit testing in software testing
How to do unit testing in java
Which is not one of the primary characteristic of unit testing:
Which is not one of the primary characteristic of unit testing:
How to set up unit testing for backbone and requirejs using jasmine
What is unit testing in oracle database
Unit testing in java how tests drive the code pdf
How to automate unit testing in visual studio 2013
Why not use standard panel unit root test for testing ppp
How to print in unit testing scode
What are the challenges of unit testing
Which of the following is unethical in testing intelligence unit ap psych
How to use repository pattern and moq for unit testing c#
How to do unit testing in angular 4
How to do async calling in unit testing
Where to buy home water testing unit
How do i use one touch ultra mini blood testing unit
For unit testing, what does "unit" usually refer to?
How to test 560sl idle speed control unit testing
How to do unit testing in objective c
What is unit testing in visual studio 2017
"for unit testing, what does \"unit\" usually refer to?"
Which tool or framework is best for unit testing api with mocks
Visual studio 2010 unit testing what to initialize values to
Laravel 5 how to unit testing queue
Which architecture better support automated unit test in software testing phase of the development?
Typescript unit testing how to test form.valuechanges
What is unit testing in java code
How to enable unit testing on ios project
What is unit testing and integration testing?
How to do unit testing with tox
Which tools are used for unit testing in angularjs
How to perform unit testing in visual studio 2012
How to start unit testing in vs2017
Where can i buy a glucose testing unit for dogs nearby
C# unit testing how to provide user input
How to do unit testing with drupla 8
How to unit testing of kafka producer in spring java
What is unit testing integration testing and system testing
How to load rootscope data by http get service in unit testing
How to do unit testing using jasmine
Angularjs unit testing how to mock $http.get response inside functin
What shouldn't unit testing be used for
How to do javascript unit testing in visual code
How would you describe unit testing?
Ios testing how to write unit tests
What is system testing and unit testing
Which of the following are javascript unit testing tools
Mocking entity framework when unit testing asp.net web api 2
How to use mock in unit testing
Why use unit testing and system testing
Which utility allows you to configure a testing module for unit tests?
How to start unit testing an application in any technology
How to create unit testing code in java
Why interfaces are helpful for unit testing
What is the primary goal of unit testing?
What is the unit in unit testing j
Who is responsible for unit testing of user story
How to do unit testing in interview
What the hell is unit testing?
Why most unit testing is a waste of time
How to do unit testing in visual studio 2013
How to test only one fucntion in unit testing python
How to perform unit testing in visual studio 2013
What is unit testing with example java
In which year unit testing was introtuded
Typescript unit testing how to test form valuechanges
What is difference between debugging and unit testing
What is unit testing in python'
Unit testing how do i get my okresult not wrapped in iactionresult
Unit testing how to trigger select, optgroup, and option change function
How to add unit testing in angular 2
What is meant by unit testing with example
What is the unit testing ci/cd jenkins
What was the testing unit for java before junit
How to do unit testing in react
How to use unit and integration testing (junit means
What can the "unit" in the phrase "unit testing" be? (more than one possible answer)
Unit testing in java how tests drive the code pdf download
How to do unit testing in c#
Which unit testing libraries you have used for testing java programs
How to set up unit testing with jenkins
How to conduct a unit testing on an inventory program
What unit is used in breath alcohol testing
How to do unit testing for web based application
What is the purpose of automated unit testing
How to perform unit testing in hive
How to do unit testing in .net
How to do unit testing for ui routing
How to setup unit testing for backbone and requirejs using jasmine
How to do the etl unit testing
How to do unit testing in abap
How to do unit testing visual studio
How to test a unity scripts unit testing
How to do unit testing in qtp
How to do unit testing in jenkinsfile
What are pylint and unit testing for ?
How will you perform unit testing of your app ?
Where to see output from unit testing
Unit testing is more viable using which approach to writing methods java
How to do unit testing in qlikview
How to test void method in j unit testing
How is unit testing done for covering regerssions
What are the benefits of unit testing described by developer
During what stage of sdlc is unit testing essential
What is the purpose of unit testing?
In which year unit testing was introduced
How is test driven development (tdd) different from unit testing?
How dependency injection helps unit testing angular stackoverlfow
How to get unit testing project in visual studio 2015 test version
Visual studio unit testing what to initialize values to
How to use unit testing in java
How to do unit testing of tableau reports
How to do unit testing in sap bi
What is stub in unit testing c#
What is the name of the unit testing framework module included with the python standard library?
Java spring how to generate unit testing report
What are the purposes of unit testing and who needs to conduct unit testing?
How to unit testing using visual studio 2013
How to do unit testing in angularjs
Why is unit testing important bob martin
How to document unit testing sample document
See what a variable holds while unit testing visual studio 2015
What is the point of unit testing in microservices
How did you do unit testing in your project
Unit testing how to fix error: 1 timer(s) still in the queue.
How to use marked in typescript unit testing
In which pahse of application unit testing is done
How to do unit testing in javascript
How to test click unit testing karma chai on lick
Why singleton design pattern interferes with unit testing
How to add another test in the j unit testing
How to use jasmine for unit testing of typescript
How to mock a database in unit testing java
What are the things comes under unit testing
How does functional testing differ from unit testing
What is unit testing and how it is done
Which action do you perform prior to unit testing to reduce the number of bugs
How to create a unit testing on css and html
Which tools are used for unit testing in angular
How to do unit testing in visual scode?
Read more

How to check if a character is a number in java?

bingchandler671 — Thu, 26 Nov 2020 17:33:19 +0000

Hi, I am new to this world of programming in java language. You might feel to check if a character is a number in java? I mean what is the best way to do it?

Solution:

I'm not sure if this is the best option or not, But this seems pretty simple to me. We can check whether the given character is a number or not by using the isDigit() method of Character class. This method returns true if the passed character is really a digit.

Please check out the example below:

public class CharacterCheck {
   public static void main(String[] args) {
      String s = "ABC123";
      for(int Count=0; Count < s.length(); Count++) {
         Boolean ReturnValue = Character.isDigit(s.charAt(Count));
         if(ReturnValue) {
            System.out.println("'"+ s.charAt(Count)+"' = Num");
         }
         else {
            System.out.println("'"+ s.charAt(Count)+"' = NAN");
         }
      }
   }
}

Output

'A' = NAN
'B' = NAN
'C' = NAN
'1' = Num
'2' = Num
'3' = Num

Also there is alternatine method, read alternative

What Should i do to start a new Angular Application ?

bingchandler671 — Thu, 26 Nov 2020 17:28:22 +0000

If you want to create a new Angular application locally you should have the following software installed on your machine.

Visual Studio Code Installation VSCode is a open source code editor developed by Microsoft for Windows, Linux and macOS. It includes the following features debugging, embedded Git control and GitHub, syntax highlighting, intelligent code completion, snippets, and code refactoring.
Node.js Installation Node.js is an open-source code, platform independent that run JavaScript code outside of a browser.
NPM Installation Angular, the Angular CLI, and Angular applications depend on npm packages for many features and functions. To download and install npm packages, you need an npm package manager. This guide uses the npm client command line interface, which is installed with Node.js by default. To check that you have the npm client installed, run npm -v in a terminal window.

So these are the prerequisites tools which you should have installed in your machine

as for as you skills to start angular application you should be familiar with the following:

HTML
CSS/LCSS/SASS
TYPESCRIPT/JAVASCRIPT

Now you have all done so the next thing is to go for creating angular application. creating angular application is very simple job you just run a command and an application will be created. to create application you will go to the directory where you want to create with cmd ( command line ) and run the command given below

How to fetch data from the database using AngularJs in php?

bingchandler671 — Thu, 26 Nov 2020 16:57:12 +0000

AngularJs code to get MYSQL data:

<script>

var app = angular.module('myApp', []);

app.controller('usersCtrl', function($scope, $http) {

  $http.get("https://freewebmentor.com/api/users_mysql.php")

  .then(function (response) {$scope.names = response.data.records;});

});

</script>

//UserCtrl is used to display all the user data on your web page.

div ng-app="myApp" ng-controller="usersCtrl">

<table>

  <tr ng-repeat="result in names">

    <td>{{ result.username }}</td>

    <td>{{ result.email }}</td>

  </tr>

</table>

</div>

<!DOCTYPE html>

<html >

<style>

table, th, td {

  border: 1px solid grey;

  border-collapse: collapse;

  padding: 5px;

}

table tr:nth-child(odd) {

  background-color: #f1f1f1;

}

table tr:nth-child(even) {

  background-color: #ffffff;

}

</style>

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>

<body>
<div ng-app="myApp" ng-controller="usersCtrl">
<table> 

  <tr ng-repeat="x in results">

    <td>{{ x.username }}</td>

    <td>{{ x.email }}</td>

  </tr>

</table>
</div>
<script>

var app = angular.module('myApp', []);

app.controller('usersCtrl', function($scope, $http) {

  $http.get("https://freewebmentor.com/api/users_mysql.php")  

  .then(function (response) {$scope.results = response.data;});

});

</script>
</body>
</html>