2D-array

Question

A is a 2D-array with the range [-5....5,3......13] of elements.The starting location is 100. each element accupies 2 memeory cells.
Calculate the location of A[0][8] using column major order and row major order.Does indexing matter??Why C follow $0$ indexing??

Comments

from column major 220    Row major  220

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there is any formula??

Does indexing matter?? Why $C$ follow $0$ indexing??

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The basic concept is

range [-5....5,3......13] 

Now make it normal so that execution is easy

-5 to 5 {contains 11 rows }

3 to 13 {contains 11 col}

size of an array A _{11 x 11}

ranges [0 ....10 , 0 ... 10]

shift from -5 to  0 we add 5 

shift from +3 to 0 subtract  3 

therefore  A[0+5][8-3] 

A[5][5] = 100 + (11*5+5)*2

            = 100 + 60*2

            = 220

similarly we do for col major oder

 

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I understand thank you so much

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@Magma @Lakshman Patel RJIT

i did not understand your solution from the line shift onwards.

Please suggest why did you do like that.

thanks

Answer 1

Row major  220 same col major 220