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The difference between the user interface and the user experience is given below:

AJAX is basically known as the Asynchronous JavaScript and XML, the unique function that it provides is that it helps to transfer the data from the server and also to the server WITHOUT REFRESHING or RELOADING the entire page. While this entire process the user has no IDEA about the things going on the background as there is no interference or issues due to this process in the user experience.

After an app is been launched in the market the user feedbacks or reviews must always be asked for. Because that will help you in designing or RECTIFYING the flaws of your app and to make it more presentable as per the demand of the users. The user requirement must be always be asked for as FINALLY, you are designing the app or the web page for them itself. ALSO certain developers before launching their app in the market. They even TRY to launch a test version of their app with similar ideas and if that works then it is FINE to launch the final complete version of the app.

There is a place or platform where you are ABLE to connect or MAKE new friends or connections. The PEOPLE always find their matches or certain strangers those who have a SIMILAR career interest, hobbies, and background. This platform also allows you to do other tasks like you can add pictures, videos and other WORK you can perform here is also you can do blogging.

You can two numbers without using the third variable in PHP as follows:

//swap two numbers without using third variable
$x=20;
$y=10;

//add x and y, store in x i.e : 30
$x=$x+$y;

//subtract 10 from 30 i.e : 20 and store in y
$y=$x-$y;

//subtract 20 from 30 i.e : 10 and store in x
$x=$x-$y;

//now print the REVERSED values
ECHO "Now x contains : ". $x;
echo "and y contains : ". $y;

//And you can make use of some predefined functions as WELL while not using the third variable. This can be done as follows:

$a = 10;
$b = 20;
LIST($a, $b) = ARRAY($b, $a);
echo $a . " " . $b;

One of the most important applications of the Stack is the arithmetic expressions’ conversion into the programming languages of high-level into a form that the machine can read. Because the computer system can understand as well as work only on the binary language, the system assumes that the arithmetic operation is able to take place only in two operands, for example, A+B, D/A, and others. But in the usual form, one arithmetic expression can consist of two or more operators plus two operands for example (A+B)*C(D/(J+D)).

This expression follows this scheme that is an is being preceded as well as succeeded by the . This kind of expression is known as infix expression. For example, A+B, etc.

This expression follows this scheme that is an is being succeeded by two . For example, AB+, etc.How to convert the Infix Expression To a Postfix ExpressionLet, X, be one arithmetic expression that is written in the infix notation. Now, this algorithm FINDS or needs an equivalent postfix notation Y.

• Push “(“onto Stack, and add “)” to the end of X.
• Scan X starting from left moving to the right. Also, keep repeating Step 3 to Step 6 for every single element of X till the Stack gets empty.
• If the OPERAND is met, add the operand to Y.
• If one left parenthesis is confronted, push the left parenthesis onto Stack.
• If the operator is met, then:
  • Regularly JUMP from Stack then add to Y every single operator (that too on the top of the Stack) that has the exact same precedence or HIGHER precedence than the operator.
  • Add the operator to the Stack.
    [here comes the end of If]
• Now, If one right parenthesis is confronted, then:
  • Repeatedly jump from Stack then add to Y every single operator (that too on the top of the Stack) until one left parenthesis is met with.
  • Then, REMOVE the left Parenthesis.
    [insert the parenthesis for End of If]
    [here also insert the parenthesis for End of If]
• Finally, END.