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In this video we're going to be looking at the different operators that are available to us in C sharp.

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No I already went ahead and created the project and I call it C sharp upper it does once again try to

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avoid any special characters when naming your projects and solutions.

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And so I just use the word sharp instead of the the special character which looks like a no sign right.

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So C sharp operators and I already took the liberty of kind of writing in some things in the main function

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so you can pause the video try and create the project yourself and put you in these comments and then

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you can resume when you are done.

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No operators are symbols that are used to performed well literal operations art.

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So in any programming language you have access to these operators when you want to do things like math

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and all the other categories where they're loathe to do things that comparisons but for this introduction

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to operators are just going to be dealing with the ones that are probably more mathematical and we need

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to know if nothing else.

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So let's start off with the basic assignment operator.

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So we have used this already in previous examples and that is used when we want to give some variable

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of value.

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So if I have a variable it's into num then I want norm to have the value of five then I want to say

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num you are assigned the value five.

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So that's really what that is it's really an assignment.

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So 1 equals sign by itself is really seen as an assignment.

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All right.

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So we're putting the value of five inside of our variable whereas signing the value of five to our variable

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No.

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All right.

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So that's the basic and very easy one and that we can always just write a console.

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That's right.

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Line just to prove that it works.

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So I'm just going to say assign assigned value to variable.

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All right.

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And then I'm going to use my interpolation.

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So we should know how to concatenate string already.

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So since I have this one of villains I mean this is the one that you're going to use more frequently

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than not.

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Otherwise use the one that's your language or your Net framework supports.

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So once again we use this to assign a value to a variable it can be multiple variables with multiple

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assignments.

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It can be a static value so static means that I have called it in meaning I put five.

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So this will never change unless I come back to this screen and change the stakes from five to 10.

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That's the only way this will change.

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But then that's what makes it static whereas when we're assigning values from the user input it makes

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it more dynamic and the principle of assigning doesn't change.

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All right.

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Now let's move on to the arithmetic operator.

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So for arthritic operators they're usually used to perform mathematical operations.

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So I'm going to define two variables are I know int x and then I'm going to show you that you can actually

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do a bit curious on and assignment in one line so I can say X is equal to five and into Y is equal to

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10.

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Right there.

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So instead of splitting it into the lines I could just see int it whatever variable is equal to whatever

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value I want and do that in one line.

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So that's another week into your assignment.

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Right.

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But for this section I want us to do some math.

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So I'm going to go through different examples that we're going to print to screen the different outcomes

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of the math that we're doing with these.

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So I'm going to say console dot console dot right.

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The line is equal to.

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And then for each line I'm going to in to use my interpolation.

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So I went to see a dollar sign open and closed quotation marks and then I went to start off with additions

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but we're going to go through the different examples additions and then I am showing the result of an

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addition operation between x and y so to add X and Y we're literally going to use the plus side.

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So anyone with a plus saying can be used for concatenation reasons also but it's a form of what we call

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polymorphism where the plus sign has multiple purposes.

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The plus sign is seeing here that I'm adding two numbers.

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So do some math whereas in the context of a string when you see block of string plus string variable

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it seeing I'm adding two strings so technically it's the same addition but the outcome is going to be

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different because we don't expect to see 5 1 0 at the end of this operation we expect to see 15 where.

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Whereas if there were strings then you would see 5 1 0.

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So adorable to just know that this is arithmetic and this is how we're adding two numbers.

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So that's all we add and I'm just going to duplicate this line because I want to show a subtraction

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multiplication division and then this one called modules.

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Right.

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So I'm just going to duplicate this console of that right line by holding down control and pressing

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D.

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So that's a nice quick way to duplicate your lines in Visual Studio and then I'm just going to change

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this also.

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This is subtraction and then subtraction it's the minus sign.

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All right.

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So we're adding x plus y and they were subtracting X minus Y so anybody who understands the basic mathematics

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this should not be too all tough place for you to understand.

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So multiplication we use the asterisk.

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We don't use the X..

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You know when we are writing it on paper we use X but as you can see X is going to be seen as x.

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So if we want to operator that handles multiplication we need to use the asterisk or the star.

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All right.

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If we're doing division then what.

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Most if not all keyboards and I was just going to go out on a limb and say no keyboard has the division

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unsigned the way we write it on paper.

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So far division have to use your slash so the same slash you use for the comments is the same slash

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that you use for division but obviously you're using one of them because if I use two then that's going

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to start some commenting right.

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So one slash that is division.

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So this is saying that X R 5 is going to be divided by Y or 10.

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All right.

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We do have modulus and then modulus is the percentage side.

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So this is basically our division within this modulus is going to return the remainder.

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Right.

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So for instance if I said 2 divided by a 1.

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You know what that me actually change the told so I can.

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When we print details the screen you see exactly what I'm seeing.

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So let's say this is three and this is two.

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All right.

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So when we see three divided by two we're going to get back one point something right.

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That's the one point five.

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That would be the decimal.

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Right.

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But then if I said modulus it's going to return one because 2 goes into three one time with our remainder

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of one.

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All right.

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So that's the difference between the division and the modulus the modulus returns the remainder of the

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division operation and division well just tries to divide so I'm going to pause right here and then

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we're going to run this operation and see exactly what's happening.

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And so we we usually go over here in our solution explorer or actually our project and say it's at the

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start of project but you've probably figured out the shorter we had to do that by no.

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And that is by selecting from this dropped only.

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So right beside the start button there's a dropdown list with all the projects and you can just see

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which one you want.

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And then go ahead and start.

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All right so on screen we're seeing the results of our arithmetic operation.

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So we assigned the value.

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That's the first one.

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And then addition is five plus three plus two is five subtraction is one multiplication is six division

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is one.

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And modulus is one.

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So because they're both returning one you're not really seeing the pull off modulus.

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So I'm going to change this and I'm going to use and when to switch these numbers are on someone to

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use three and I'm going to use value like eight.

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So at least we know that when we hit the modulus we won't be seeing the same for the division and the

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seeing for the modulus but actually you will be sorry if my math is my my slip no.

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Let me try.

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Eleven so eleven divided by three is going to be three times but then the modulus is expected to return

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to because that's the remainder from this division operation.

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So let's try that again all right.

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So here we go.

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So we are getting different values because well once again it's X and Y and whatever we put in as of

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others of X and Y will influence the math being done.

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So three plus 11 is 14.

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Three from 11.

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That is eight or if I'm to read it exactly how we wrote it.

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That's eleven minus three leaves eight multiplication that is 11 times three division that is 11 divided

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by three is three.

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So it goes into it three times.

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I notice it's returning just an INT.

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All right.

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And then I say give me the modulus.

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So it's returning home many.

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You know the remainder of the division operation of eleven and three no right now we're adding two variables

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what if we wanted to add a variable to the value it had in it's of as well as another value.

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So for more context I wanted to add whatever X is and add four more to it.

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So whatever value X has.

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I want to add forward to it.

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And that should be the new value of x.

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So that means I would have to do something like X is no assign the value or X is equal to itself to

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loss for right.

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So I'm doing this after this operation so 11 3.

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Those are the values.

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And then the math will be done with the values of eleven point three.

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But then I want to change the value of x to be four more than it was when it was first initialized.

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Right.

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So now I'm adding four to whatever value X had because X is a variable I don't know what it has at any

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point.

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So I have to retain it in the math.

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And then after that math is done I assign it to itself so that with that done I'm just going to use

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this console right line and then I'm going to see a new value of x and then I'm just printing X to the

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screen and then just to prove that that gave it a new value I'm going to print reprint all of these

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additions operations are sorry all of these arthritic operations using X and then the expectation is

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that the values that the initial operations would have yielded should be different from these values

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after we've changed the value of x so let's try that.

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So now we can take a look and we see that okay all of these values were the same as we saw last time

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but then the new value of x is 15 because like I said we added four to whatever value X had and then

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it will work all different math because the value of x is different.

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Notice the division isn't all five because three goes perfectly into fifty and five times and these

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nor I mean those no operations like this are done all the time most you know you don't always know what

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value is there so you just retain the variable and do whatever addition or subtraction and multiplication

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it can be done with any other operators.

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If I wanted to multiply the value of X by four then I just say X is equal to its of times four and then

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that's its new value.

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No because of that function or the need to do that kind of function we have what we call compound assignment.

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So instead of having to type of x is equal to x plus four then we can actually do something like x plus

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equals five.

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So I'm just going to answer it for.

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Since we're using for it let me use for all the time.

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So I'm just going to copy this down here and show you that these two lines are seeing the same thing

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X plus equals four is the same thing as saying X is equal to x plus four and the same applies for any

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other operation that would be carrying out.

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So if I wanted to see X should be equal to x times five.

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All right so X is new value should be itself whatever value it has at the time.

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Times five whatever this use should be assigned to X.

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That's the same thing as seeing another right.

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The longer we in comments initially the shorter we x star equals five.

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All right.

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So any time we want to do that kind of operation where we're assigning the variable a new value based

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on what its value is already then we can rewrite it either way.

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We can write it as X is equal to x times five.

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Or we can see the variable which is x in this case that operates all equal.

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I notice there's no space there's no gap here.

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If you put that space there you might get an arrow.

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So it is operator assignment operator.

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And then the value and then that would imply to C sharp that you're doing this operation.

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All right.

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So I just wrote out some examples of assignment operators who can take some time and write these off.

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But what I'll be doing here is changing the value of X with each operation just showing you that whatever

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the operation is with the arithmetic symbols can be used for the compound assignment.

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And as long as you just have that operator and then the equals sign.

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So let's try it again.

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All right so we have our first block where we did our assignment.

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It is the value was 11 and then we did the operations eleven and the three I believe.

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Yeah.

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And then we did the operations with the three and eleven and then we changed the value of the x variable

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to 15.

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And then we did new operations and then by the time we got down there the value was still 15 because

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we didn't change a value again until I said X plus equals five.

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So 15 plus five is 20.

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Then I said X minus equals three which means whatever value I have no which is 20 I want it to be equal

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to that value minus three.

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So by variables value got set no to 17 because it was 20 minus three.

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And that's the new value of X then we go on to say whatever the value of x is I want to multiply it

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by two.

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So I am saying 17 times two is no thirty four.

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Then I say okay whatever value that has make it make x no equal to that divided by three and thirty

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four divided by three is pretty much eleven.

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And then we went on to say give me the modulus of three into eleven and then that gave us the two.

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So that's just how we handle compound assignments and arithmetic operations.

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So like I said these are not all of the operators that are available to us in C sharp.

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And by extension any other programming language but this is a good place to start.

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And as we go along look at if statements and for losers start seeing other operators use for other things.