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tight vortex Mar 6, 2023, 4:41 AM

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Hey all, I have a question from a homework assignment and I don't really understand what the question is fundamentally asking

hazy merlinBOT Mar 6, 2023, 4:41 AM

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tight vortex Mar 6, 2023, 4:42 AM

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I understand arrays and everything I just don't get how this would look if I were to write the code and execute it, for example

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Or how to approach an answer if that makes sense

quick crescent Mar 6, 2023, 4:44 AM

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from the question, you'd basically have int[][] m = ...; the the code that it states, all in the main method of an arbitrary main class

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you're supposed to basically run the code manually though

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like, in your head

tight vortex Mar 6, 2023, 4:44 AM

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right

quick crescent Mar 6, 2023, 4:45 AM

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you do understand the code itself, right?

tight vortex Mar 6, 2023, 4:45 AM

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yes

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i believe so

quick crescent Mar 6, 2023, 4:45 AM

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try going through step-by-step then

tight vortex Mar 6, 2023, 4:46 AM

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okay lemme think this through

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im definitely not 100% on my java right now though lmao

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so then

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would your answer be 10

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or am i buggin

quick crescent Mar 6, 2023, 4:47 AM

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yeah

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wait no

tight vortex Mar 6, 2023, 4:48 AM

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?

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because wouldn't you

quick crescent Mar 6, 2023, 4:48 AM

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i brainfarted too 💀

tight vortex Mar 6, 2023, 4:48 AM

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holup

quick crescent Mar 6, 2023, 4:48 AM

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i think you made the same mistake as me lol

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spoilered in case you want to retry yourself
||the first indexing is rows, not columns||

tight vortex Mar 6, 2023, 4:49 AM

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yeah lemme

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try again

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no i got 10 again

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maybe im missing something

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ohhhhhhhhhhhhhhh

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okay

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so then

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nah i still don't get it

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@quick crescent so

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if the first indexing is rows would it be 9

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or am i still tripping

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im not super great at the mental coding stuff

quick crescent Mar 6, 2023, 4:51 AM

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yeah it'd be 9

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the table format is a bit confusing to transform into an array

tight vortex Mar 6, 2023, 4:51 AM

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that was like 30% a guess tbh

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okay i got like 2 more i think i can work through them on my own these are a bit easier but im still kinda confused

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would you mind helping me?

quick crescent Mar 6, 2023, 4:52 AM

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but if you were to translate that into code you'd get

int[][] m = {
  { 1, 1, 1, 1 },
  { 1, 2, 3, 4 },
  { 2, 2, 2, 2 },
  { 2, 4, 6, 8 }
};

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so doing [1] on the second indexing gets the second column rather than the second row

tight vortex Mar 6, 2023, 4:53 AM

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ok

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i see that makes more sense

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thank you again

hazy merlinBOT Mar 6, 2023, 4:53 AM

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tight vortex thank you again

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quick crescent Mar 6, 2023, 4:53 AM

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tight vortex would you mind helping me?

yeah go ahead

tight vortex Mar 6, 2023, 4:53 AM

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okay this one i don't get because

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the swaps and stuff

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i think it would be "5 4" but i really don't know

quick crescent Mar 6, 2023, 4:54 AM

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it would be that yeah

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be a bit more confident lol

tight vortex Mar 6, 2023, 4:54 AM

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hahahahah

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i should lmao

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i understand magic squares and i understand the code but i don't really know how they would relate in terms of the missing code

quick crescent Mar 6, 2023, 4:56 AM

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have you ever heard of "let the units guide you" in physics

tight vortex Mar 6, 2023, 4:56 AM

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no, sorry

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oh wait i think my teacher has a similar saying though

quick crescent Mar 6, 2023, 4:57 AM

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like if you remember all the units then it's not too bad to derive the equation

tight vortex Mar 6, 2023, 4:57 AM

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okay yeah my teacher says "follow the units" when we do stuff like that in physics

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especially w thermo which is what we r doing now

quick crescent Mar 6, 2023, 4:58 AM

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force is in Newtons, which is kg m/s^2
and from that it's obvious what the equation could be
mass is in kg
acceleration is m/s^2
F = ma

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so yeah you can use something similar here with the types

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also, consider:

hazy merlinBOT Mar 6, 2023, 4:59 AM

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A single equal sign is used for assignments. int value = 5;. For comparing primitves you use two equal signs if (value == 5) and for Objects .equals() if (string.equals(otherString).

tight vortex Mar 6, 2023, 4:59 AM

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right

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ohhh shit

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i think

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would that mean its option 2?

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because

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the sums and the square would be the same?

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like the sums of the rows/columns/diagonals would be the sum of the magic square?

quick crescent Mar 6, 2023, 5:03 AM

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no, anything with = is wrong

tight vortex Mar 6, 2023, 5:03 AM

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oh

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then 3, right?

quick crescent Mar 6, 2023, 5:04 AM

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about the types thing
consider the return types and params of the methods
figure out how they fit together
you have a int[][] square to start and you want a boolean output

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yep

tight vortex Mar 6, 2023, 5:04 AM

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i see

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okay i understand

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thanks so much man

hazy merlinBOT Mar 6, 2023, 5:04 AM

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tight vortex thanks so much man

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tight vortex Mar 6, 2023, 5:05 AM

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i was struggling fr

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@quick crescent really appreciate the help, im gonna close this thread now 🤞

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