 So this week we're going to continue our refresher from what we learned in Java one and Since we kind of only got to touch it a little bit in it on class I want to do it at least a quick little refresher again on the idea that Now that we're working with Java now that we're playing with Java One of the things that we want to do is we want to be able to store data for later use And that's where we get these different data types. We've got integers, booleans, characters. We use all of these now that we've Stored information in memory. We use these so that we have different degrees of what we can store and they range from our primitive types like we see here or our object types Such as strings, which we'll get into a little bit later on today. So Again, why was this important? Well, if you remember from the previous videos and the lectures The World of Warcraft example where we could actually run into a buffer overflow if we have too many numbers So we do have to plan ahead now in the case of the World of Warcraft video I think you know they planned ahead well enough But ten years down the line it happens so Some of the things that we can do is now that we've started to create these Variables one of the things we have to do is we have to look at all the different operators that we can use in conjunction with that and We start with the basic operators the ones that we've already talked about for example that equal sign Again, we have to think about the computer as a very dumb machine What does the equal sign mean? You know just think about that conceptually for a second You know why is it you know equals means equals? If you go back, it's way back in kindergarten You got taught somehow that that just that's what that does it Says that this is gonna equal this these two things are equal parties And then you learned in algebra. Well, that was where we could start to give that equal sign a little bit more Power we gave it something known as being able to do Assignments and that continues all in when we start to talk about programming now We start to look at things in the sense that if we look at something like this equal sign here if I put a variable an x on one side what I can do on the right side is now I can apply some Arbitrary value and now I've given x of value now I can do other things with that and that's where I can start to see my Arithmetic operators the plus sign the minus sign those again. Why are those? So important. Why do we know that the the crosshair? Means addition. Why do we know that the dash means subtraction? Why do we know that the asterisk mean means multiplication? We did not learn that when we learned basic multiplication. We learned the good old-fashioned X or if you started getting into algebra. We didn't learn the asterisk necessarily you learned a solid Sorry You learned a solid Dot that looked something like this And then again when we start looking at something like division. Well, we don't have This symbol on our keyboard. So what can we do? We start to use What we have available to us and if we look at that slash it looks eerily similar to our Fractions now this guy right here. This guy probably gave you a lot of trouble in Java one and this is known as the modules not actually the percent sign now What happens here is this provides us with what's known as the remainder? if you guys remember from your Division classes when you started to learn division in elementary school One of the things that you would run into is you would have something like a remainder so say for example We had the math equation 5 divided by 2 Well 5 divided by 2 2 is an even number 5 odd. What's going to happen is it would equal 2.5 But again, we hadn't learned death decimals just yet or how to use decimals in division so what happens is You would say that we had a 2 with a remainder of 1 The same thing actually comes into play when we start to look at Modulus we would say something like 5 Modulus 2 what we're saying is what is the remainder that would happen if I did 5 divided by 2 what is My remainder well in this case it would be a 1