For loops, Shift Registers and Auto-Indexing #2

[SercoSteveB]

What is Numeric Value Out after the following has executed?

 

a)    A 1D Array with contents {0,2,12}

b)    A 1D Array with contents {0,2,24}

c)    A 1D Array with contents {0,2,48}

d)    A 1D Array with contents {0,2,96}

[SercoSteveB]

Answer: C

For each of the four iterations of the outer loop (defined by the constant value wired to the Count (N) terminal) the inner loop will iterate three times (defined by the size of the auto-indexed array).

At run-time:

The following tables show the contents of the three element array (in the shift register) before and after execution of the inner loop, for each of the outer loop iterations.

NOTE:  Modifications made to the array within the inner loop are passed to the next iteration of the outer loop via the shift register.

Outer loop iteration #1

Array Element	Array contents before inner loop	Array contents before after loop
0	1	1×0=0
1	2	2×1=2
2	3	3×2=6

Outer loop iteration #2

Array Element	Array contents before inner loop	Array contents before after loop
0	0	0×0=0
1	2	2×1=2
2	6	6×2=12

Outer loop iteration #3

Array Element	Array contents before inner loop	Array contents before after loop
0	0	0×0=0
1	2	2×1=2
2	12	12×2=24

Outer loop iteration #4

Array Element	Array contents before inner loop	Array contents before after loop
0	0	0×0=0
1	2	2×1=2
2	24	24×2=48

Following four iterations the outer loop completes and the value in the shift register, a 1D array containing {0, 2, 48}, is passed to Numeric Array Out.

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