A revision question about Multi Dimensional arrays (2 Viewers)

[juventino]

As I was doing some revision questions from the execl, I stubbled across this one...and it doesn't explain it all that well.

ARRAY 1 2 3 4
----------------------------------
1 | 2 3 1 6
2 | 3 9 4 8
3 | 7 4 16 11

What is the value of : ARRAY[ARRAY[2,3],ARRAY[2,1]] ?

a)11
b)1
c)7
d)8

Ok...HOw does this work?!! (the answer given at the back is 11 by the way)


Thanks

 

[sunny]

As I was doing some revision questions from the execl, I stubbled across this one...and it doesn't explain it all that well.

ARRAY 1 2 3 4
----------------------------------
1 | 2 3 1 6
2 | 3 9 4 8
3 | 7 4 16 11

What is the value of : ARRAY[ARRAY[2,3],ARRAY[2,1]] ?

a)11
b)1
c)7
d)8

Ok...HOw does this work?!! (the answer given at the back is 11 by the way)


Thanks

Lets break down ARRAY[ARRAY[2,3],ARRAY[2,1]]

ARRAY[2,3] = 4 (across 2, then down 3, like coordinates; x then y)
ARRAY[2,1] = 3

Thus,
ARRAY[ARRAY[2,3],ARRAY[2,1]] = ARRAY[4, 3]

Go 4 across, then 3 down, and you have 11.

 

[Winston]

Heh easy dude, look at it logically basically it's saying obtain the real positions, so if you look for the numbers it's actually [4,3] which is essentially point to 11, because ARRAY[2,3] = 4, and ARRAY[2,1] = 3 right?

*EDIT damn, sunny beat me

 

[juventino]

Hahaha, Just after I posted I was talking to a friend and understood it, but thanks anyway guys.

 

[Wild Dan Hibiki]

hehehe i did that question a few days ago, good thing i got it wrong during class exercises so i was able to remember how to get the answer.