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Now, after this import the next few lines in our program, we are basically having the MWD string variable,

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we are having the key variable, which is having the value given us 30.

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And we also have the more type which is encrypted.

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And I decided to encrypt decrypt.

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Now here, the MSD string, it basically stores the string that is to be encrypted or decrypted.

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And the key variable that is our key stores, the end of the encryption key.

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Right.

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So the more type variable over here stored the string encrypt decrypt, which makes either the code

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later in the program that is encrypting a string or decrypting a string.

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Now coming to the constants and the variables that are used in this program.

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Now, constants basically are variables whose values shouldn't be changed when the program runs.

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Now, for example, in the CS ASIFA program, we need a string that contains every possible character

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that can be encrypted with this program now because that string shouldn't be changed.

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We store it in a constant named symbol's type.

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Right now, one more thing over here.

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We will make similar type like this and let's copy it everywhere that we have used the particular variable.

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Now we will show you what is the use of this, but let's see if this and run I get.

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OK, fine.

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So now over here you can see the variable that we have taken is basically just a common item, which

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is used in a cryptography for a single character that is a cipher to encrypt decrypt.

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Now, a symbol basically is a set which is every possible symbol for the set up to encrypt, because

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we will be using the symbol said many times in this particular program and because we don't want to

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tie the full string value each time it appears in the program, we are using your constant to store

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the values.

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Why have we changed to all uppercase?

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Because whenever we use any variable name all in uppercase, it means that we are using it as a constant.

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So the value once assigned will not be changed.

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It is just like any other variable that all uppercase name reminds the program.

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What I do not write the code that does so, as with all the conventions, if you don't have to follow

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this one.

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But doing so makes it easier for other programs to understand how these variables are basically used.

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Right.

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Then we take a blank string variable that is translated as Steyr, which is just having a blank volume

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and do it, which will be storing the translated value in the given variable.

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Now for it currently we are giving it the blank value itself.

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Now we come to our formal statement over here.

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Now we are using this for SVM in our message Oremus G String.

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We recall that Ovie loop the loop as long as a certain condition is true and also the for loop has a

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slightly different purpose and doesn't have a condition like the loop.

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Instead it loops over a string or a group of values.

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So for every value in M is destroying, the volume will go on executing itself.

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And each time the program execution goes through the loop that is on each iteration to the loop.

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The variable in the fourth statement takes on the value of the next character in the variable containing

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a particular string.

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In this case at this is just not for the fourth statement is similar to an assignment statement because

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variable is creative.

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Assign the value except the false statement cycles to different values to assign the variable.

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Now let us see a simple example of for loop.

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We'll just go to the interactive shell over here and we will type the particular form of things before.

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Letter, see?

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Happy here we are seeing Brent, in fact, the letter is plus the value of letter.

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OK, so here we get each an individual value of the particular character getting printed at the end

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of the line.

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So this particular group gets all the gold loops over each character in the string happy.

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And when it does, the variable little takes on each of the characters in the string.

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Happy one at a time in order so we can just rewrite the code in the loop that brings the value of liquor

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for each iteration.

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Now, again, similarly, we understand of how I look at providing fuel or fodder for the formula is

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very similar to Vilo.

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But when you only need to iterate over characters in a string, using a for loop is more efficient and

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you could make a loop at like a four Liuba writing a bit more code like this, for example, I go to

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zero, we save while I is less than the length of C happy column.

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You open the envelope here.

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Here we use letter that's equal to say happy.

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At the index, I will use your brain in single quotes, the letter is plus the value of letter and we

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say, I will stop I plus one.

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So here again, we get the same values printed over here using the value.

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So notice that this file looks the same as we had before, but is not as short and simple as the photo

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of the month, which we have written about.

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First, we need to set a variable that is to zero before the final statement.

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Then the statement will have a condition that will evaluate to true.

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As long as the variable is then the length of the string happy because it is an integer and only keeps

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track of the current position in the string.

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We will need to declare a separate letter variable to hold the character in the string at the position,

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and then we can print the current value of the letter to get the same output as the formula.

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So when the code is finished executing, we need to increment also the eye by adding one to to move

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it to the next position.

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So it is better for us to use the for loop in case of, hey, look over here, because we will make

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it a more shorter and smarter look on loop, which we can write down in no particular program.

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Now we move on to our next part in the program that is coming to the F condition.

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Here we are using if Asli in our simbel right now, you can read an if statement as so if this condition

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is true, execute the code in the following block.

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Otherwise, if it is false, skip the block.

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And if statement is formatted using the key, if followed by the condition followed by a colon, the

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code to execute is in the neck in the block, just as with the loops.

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So for example, we will try an if statement and see how does it basically look.

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C will go back here and we will see print C and.

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Your.

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But whether you made a mistake, your friend and

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your password.

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OK, but now we basically need to write down in a separate file as we need to execute this together.

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So what we will do is let's go for a new file and we would write down, say, print and of your password.

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Then we will create here, say password input is equal to use the input method, store whatever password

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the user have type over here.

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Check if the.

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Password input.

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Is equal to a particular possible settlement, one to three, for example, if it is, then you say

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access granted and use your friend.

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See that?

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OK, so now we save this.

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Let us save it again in e drive hacking big enough and we save it over here by the name Cicek Password,

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not Fibi.

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00:08:55,510 --> 00:08:58,000
And we try to execute this.

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So enter password.

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Now we enter a capital we had given that a small so it does not giving us the access.

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00:09:05,020 --> 00:09:08,160
Granted it is just Google giving us the value done.

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But suppose we go back here we again run the module, the internal admin.

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One, two, three.

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It says access granted and then the statement is done.

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So then you run the particular program with displays your full that that is enter your password and

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lets the user type the password over there.

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Whatever password is then typed by the user is stored in the variable that we have created.

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That is our password input.

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Right next.

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The if statement checks the password is equal to the string that is admin, all in small case, one,

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two, three.

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If it is the execution rules inside the block following the if statement of the text as X is granted.

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Otherwise, if the password input isn't equal to admin one, two, three, even if the case is all that

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is a capital admin or something like that, the execution skips the if statement block either way and

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the execution continues on to the court after the if block or display, just the statement that's done

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right now.

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Similarly, we will see what happens if we use the statement over here, OK?