WEBVTT

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Now let's talk about functions that can return values.

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So let's see an example.

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We're going to make a function called Square and all of this will do is square the number that we pass

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into it.

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And notice here that we have it at the start of the signature and it is the return type of the square

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function.

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So it's going to return an integer to the color of the square function.

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So it's defined square here.

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X and all this will do is return back to the caller.

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The number that they passed in multiplied by itself.

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And to do this we use this return keyword so return once it's executed then it will return the control

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flow back to the caller.

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So for example if we had more lines of code here K

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these would never be executed because we already returned the control flow and this value right.

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This this will evaluate to an integer and we'll return back to the caller.

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So let's say here say

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Square let's say 5 is

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can we call it rate here and we can do this because Square really just evaluates to an integer.

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So this whole thing will evaluate to basically this down here k.

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And since square returns an integer you can just print out at integer just by calling the square function.

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So it's just reminiscence the square 5 is 25.

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It's not very surprising.

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So we're talking about here with that return key word so say we had C out after the return.

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If we run that.

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So you will never actually see that because return returns the control flow of the program back up to

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its caller.

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So the caller is Main in this case and after this line it will go back up to here.

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Ill print out this whole whole thing.

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This square of five is twenty five.

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And meanwhile continue on its merry way.

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Kay so it will never do this.

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So keep that in mind if you return something and you don't have some kind of condition or something

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associated with it.

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Nothing else after that will execute

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an really return the return type can be any type we want so it is not limited to any type that we looked

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at.

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Right.

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So and we'll see this a bit later as well.

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So for now the return values will be limited to our basic types that we can over but later on you'll

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see that all get into some more complicated types so in the next lecture I'm going to talk about some

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more interesting things.