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Onwards, the part two in the first video we went through, the first four operators and we saw a very

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cool pattern in operation between whole numbers will return a whole number and an operation between

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decimals always returns a decimal.

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Now you're going to see the very same pattern as we go through the remaining five operators.

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And the first one is the modulus operator, which is expressed by the percent sign and what the modulus

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does is it returns the remainder of a division.

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When you divide two numbers like ten divided by two, what remains is the modulus, in this case, the

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modulus from dividing ten by two is zero.

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And in Java, the modulus operation involves the dividend and the deviser, this operation will divide

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ten by two, but it won't return the result of the division, it returns the remainder.

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But why do we care about the remainder?

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It's very useful if you want to identify odd or even numbers when you divide an even number by two like

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10.

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The remainder is zero.

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When you divide an odd number by two, the remainder is not zero, which makes five an odd number.

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So we can prove this in our code.

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We're going to grab the last two strings from the article.

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Comment them out and we're going to put them in print statements.

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System, dot, dot, dot, print line.

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System out print line.

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And we'll just put in both string's.

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OK, so at the end of the first string, we're going to connect the modulus from dividing 10 by two.

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And in the second string will connect the modulus from dividing five by two.

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OK, compile the code and run it, and indeed the modulus from the Vining, ten by two is zero, which

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makes ten even and the modulus from dividing five by one is not zero, which makes five an odd number.

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All right, let's talk about the ad one operator whose symbol is represented by two plus signs and what

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this operator does is it increases the value by one.

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And this operation is very common for integer variables because suppose you had a counter variable of

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type event which starts at zero.

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And when you place plus plus next to the variable, it increases the counter value by one doing so three

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times.

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The counter value ends up being three.

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This is pretty straightforward and let's make it official by doing it in code.

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So I'll right int counter.

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Is equal to zero and will increase the value by one three times countered plus plus.

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Counter plus plus.

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Encounter plus plus.

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Then I'm going to print system.

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Dart out front line.

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And we'll connect the counter value.

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Compile your code.

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And sure enough, the counter equals three.

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Conversely, the subtract one operator is represented by two minus signs, and it's a role that's a

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decrease value by one.

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This operation is also common for integer variables because suppose you had a counter variable that

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starts at three and when you place minus minus next to the variable, it decreases the value by one.

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Do this three times in the counter ends up being zero.

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OK, we can try this in Java.

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We're going to write counter minus minus.

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Counter minus, minus and one more time, counter minus, minus.

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We're going to copy and paste the first print statements.

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Recompile the code.

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Subtracting one three times, as expected, return zero, because the counter starts at three in each

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decrement, removes one from the counter value.

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All right, let's talk about the ad buy operator, whose symbol is Express's plus equals the ad buy

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operator.

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What it does is it adds the value on the right and we already use it in the updating variables video.

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You saw an example where a bus started with zero passengers.

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The plus equals operator was used to update the value by adding nine the value on the right.

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And conversely, we also have a tracked by operator, which you've already seen as well, and this one

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subtracts the value on the rights.

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We also use this in the updating variables video.

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So from the same example, the bus dropped off five passengers, then four.

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And in both cases, the minus equals operator subtracts the value on the right.

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All right, let's recap, we just used every math operator in Java in every math operation follows a

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very nice pattern to study.

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Math operation between two whole numbers will always return a whole number and then operation between

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decimals will always preserve the decimal.

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And now I'm going to recap all the operations we looked at so far, and they are the plus operator to

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add values, subtraction, to subtract values, multiplication and division, to multiply and divide

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values.

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The modulus operator returns the remainder of a division.

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The add one operator increases the value by one e subtract one operator decreases a value by one, add

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by increases in value by adding the number on the right and subtract by decreases a value by subtracting

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the number on the rights.

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That is all.