Vani online test series

Question

how the answer is 23699?

For column major order I get answer as 80039.

Even if i go by row major order the answer I get is 23599

Comments

Yup then for column major the formula is

Base+(i3*d2*d1+i2*d1+i1)

Right?

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I'm sorry, but i follow a different notation and calculation procedure. If this formula gets you the result then probably yes this is it.

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No the result I got is 80039.. if I go by column major order..  can you explain me how you came with that result?

Answer 1

I'm not into formulas.
first I changed the base address from A[1,1,1] to A[0,0,0] for ease of calculation so now I need to calculate A[19,19,29]
Then I go into the required 2D Matrix which is the 19th matrix where each matrix is of size 30x40 hence 19x30x40
Then I check if its col major or row major, since column major I go to reqd col which is 29th column crossing 30 elements of each row ie 29x30
Now i'll proceed to the 19th row ie 19
19x30x40 + 29x30 + 19

Comments

The same can be verified by the following code:

int main()
{
int a[90][40][30];
printf("req addr is %d + 10 = %d",(int)(&a[19][29][19])/4-(int)a/(int)sizeof(int),(int)(&a[19][29][19])/4-(int)a/(int)sizeof(int)+10);
}