Task 5: Complete the following function: function CHECKCOLUMN (puzzle, j) end function This function will take the vector puzzle (as produced by MAKEVECTOR) as an input parameter and check that column j contains all numbers from 1 to 4: if it does contain all numbers from 1 to 4, it should return TRUE, otherwise it should return FALSE. The procedure you should use is the one outlined above. To get full marks you need to call SEARCHSTACK(stack, item).

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Task 5: Complete the following function:
function
CHECKCOLUMN(puzzle, j)
end function
This function will take the vector puzzle (as produced by MAKEVECTOR) as an input parameter and check that
column j contains all numbers from 1 to 4: if it does contain all numbers from 1 to 4, it should return TRUE,
otherwise it should return FALSE. The procedure you should use is the one outlined above. To get full marks you
need to call SEARCHSTACK(stack, item).
Transcribed Image Text:Task 5: Complete the following function: function CHECKCOLUMN(puzzle, j) end function This function will take the vector puzzle (as produced by MAKEVECTOR) as an input parameter and check that column j contains all numbers from 1 to 4: if it does contain all numbers from 1 to 4, it should return TRUE, otherwise it should return FALSE. The procedure you should use is the one outlined above. To get full marks you need to call SEARCHSTACK(stack, item).
Once we have a method for checking one column, we can use the following function to check all columns:
function
for 1 ≤ i ≤ 4 do
COLCHECKS(puzzle)
if CHECKCOLUMN(puzzle, j)
=
return FALSE
end if
end for
return TRUE
end function
This will be useful later on.
FALSE then
The next set of conditions to check is to see if all integers from 1 to 4 appear in the 2-by-2 sub-grids. In the
next task, the goal is to replicate the approach of the function CHECKCOLUMN but for these sub-grids. In the
function you should repeatedly call SEARCHSTACK for each element in a sub-grid, and then do this for all four
sub-grids.
Transcribed Image Text:Once we have a method for checking one column, we can use the following function to check all columns: function for 1 ≤ i ≤ 4 do COLCHECKS(puzzle) if CHECKCOLUMN(puzzle, j) = return FALSE end if end for return TRUE end function This will be useful later on. FALSE then The next set of conditions to check is to see if all integers from 1 to 4 appear in the 2-by-2 sub-grids. In the next task, the goal is to replicate the approach of the function CHECKCOLUMN but for these sub-grids. In the function you should repeatedly call SEARCHSTACK for each element in a sub-grid, and then do this for all four sub-grids.
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