Question

In: Computer Science

I wrote a code snippet to draw a bit of 'abstract art': yertle.penDown(); yertle.forward(10); yertle.right(Math.PI/2); yertle.forward(10);...

I wrote a code snippet to draw a bit of 'abstract art':

yertle.penDown();
yertle.forward(10);
yertle.right(Math.PI/2);
yertle.forward(10);
yertle.right(Math.PI/2);
yertle.forward(10);
yertle.right(Math.PI/2);
yertle.forward(10);
yertle.right(Math.PI/2);
yertle.left(Math.PI/2);
yertle.forward(20);
yertle.right(Math.PI/2);
yertle.forward(20);
yertle.right(Math.PI/2);
yertle.forward(20);
yertle.right(Math.PI/2);
yertle.forward(20);
yertle.right(Math.PI/2);
yertle.left(Math.PI/2);
yertle.forward(30);
yertle.right(Math.PI/2);
yertle.forward(30);
yertle.right(Math.PI/2);
yertle.forward(30);
yertle.right(Math.PI/2);
yertle.forward(30);
yertle.right(Math.PI/2);
yertle.left(Math.PI/2);
yertle.forward(40);
yertle.right(Math.PI/2);
yertle.forward(40);
yertle.right(Math.PI/2);
yertle.forward(40);
yertle.right(Math.PI/2);
yertle.forward(40);
yertle.right(Math.PI/2);
yertle.left(Math.PI/2);
yertle.penUp();

My instructor suggested I could get the same result from a much shorter program, but I don't see how.
What should I write instead?
(Keep it concise, and don't include anything outside the scope of the question)

Expert Solution

yes,

this seems a pretty long code. the thing you want to do can be done with much lesser steps.

i can see from the code that you are running similar lines of code many times.

like all your code is full of 'yertle.right(Math.PI/2);' and 'yertle.forward(i);'.

now you have done this 15-16 times. but suppose if we get a similar question where we need to do it a 1000 times. in that case we can't write these instructions a 1000 times manually. right?

for purposes like these we use the concept of 'loop'. loop is something which helps us to write multiple lines of code in just 3 lines.

this does nothing but saves our time.

just to give you an example,

see the following code

instead of writing the same stuff 4 times, what we can do is to run a loop.

we use 'for' function to run a loop.

in the above example, we need to run the loop 4 times. so we will use the 'for' loop as

more precisely, it can be written as:

for(int i = 0;i<4;i++)

{

yertle.forward(40);

yertle.right(PI/2);

}

this will work same as

so you see, we can save so much of time if we run a loop.

your instructor might be talking about this.

hope it helps

venereology answered 5 months ago

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