FAQ: 2D Arrays: Java - Traversing 2D Arrays: Row-Major Order

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This community-built FAQ covers the “Traversing 2D Arrays: Row-Major Order” exercise from the lesson “2D Arrays: Java”.

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FAQs on the exercise Traversing 2D Arrays: Row-Major Order

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[core2508138877]

I don’t quite understand the purpose of this lesson. I had no trouble actually doing the exercises, but the way row-major order is introduced makes it sound like it’s something new, but it seems like this is just what we’ve done before. Am I missing something?

[logicdictates]

I would say the same thing especially with that last task… why is it when u put in outer.length it prints 6 numbers when in reality there should be 3 because there are 3 rows and 6 should be for the inner??

[jeanasong]

Here’s an image of the solutions to the questions.

[ruby8188801477]

Hi all,

I am confused about how is runnerTime += times[outer][inner] calculating the row sum. I looked up more information online, someone said that if you want the sum of the column only, then you will need to do this: int colSum =new int[times[0].length]; then inside the for loop, add colSum[inner]+=times[outer][inner].

Now I am even more confused.

About the row sum: My understanding for “times[outer][inner]” is that “times[outer][inner]” represent each element of the inner array, so how is “runnerTime += times[outer][inner]” calculating the row sum not the sum of every element in the array? Is it because I reset the runnerTime to “0” after the outer loop?

About the column sum: I understand int colSum =new int[times[0].length]. But “colSum[inner]+=times[outer][inner]” does not make sense to me…

Can someone explain to me? Thanks in advance!

[josephjones581810738]

Hi I’m a bit confused by that myself perhaps the more we practice the more calling certain variables within arrays will make sense
Best of luck Friend!

Joseph