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    Warning: count(): Parameter must be an array or an object that implements Countable in /home/customer/www/thegatebook.in/public_html/qa/qa-include/qa-theme-base.php on line 580

Warning: count(): Parameter must be an array or an object that implements Countable in /home/customer/www/thegatebook.in/public_html/qa/qa-include/qa-theme-base.php on line 177

Warning: count(): Parameter must be an array or an object that implements Countable in /home/customer/www/thegatebook.in/public_html/qa/qa-include/qa-theme-base.php on line 177

Warning: count(): Parameter must be an array or an object that implements Countable in /home/customer/www/thegatebook.in/public_html/qa/qa-include/qa-theme-base.php on line 177

Warning: count(): Parameter must be an array or an object that implements Countable in /home/customer/www/thegatebook.in/public_html/qa/qa-include/qa-theme-base.php on line 177

Warning: count(): Parameter must be an array or an object that implements Countable in /home/customer/www/thegatebook.in/public_html/qa/qa-include/qa-theme-base.php on line 177

Warning: count(): Parameter must be an array or an object that implements Countable in /home/customer/www/thegatebook.in/public_html/qa/qa-include/qa-theme-base.php on line 177

DSA - Grand Test -Q11


Warning: count(): Parameter must be an array or an object that implements Countable in /home/customer/www/thegatebook.in/public_html/qa/qa-include/qa-theme-base.php on line 177
+2 votes

A stack can be implemented with an array A[0,..,n-1],  and a variable pos. The push and pop operations are defined by the following code :

push (x)

  A[pos] \leftarrow  x

  pos \leftarrow pos - 1

end push

pop ()

  pos \leftarrow pos + 1

  return A[pos]

end pop

Which of the following will initialize an empty stack with capacity N for this implementation ?

(A). pos \leftarrow -1

(B). pos \leftarrow 0

(C). pos \leftarrow N-1

(D). pos \leftarrow N

asked Aug 29, 2020 by gbeditor-2 (72,840 points)
reshown Sep 10, 2020 by gbeditor-2

1 Answer

0 votes
 
Best answer

The push and pop operations are defined in a manner that stack grows downward. So, initially pos should N-1 when stack is empty because in push code, we first insert element at pos and then decreases pos.

answered Sep 26, 2020 by deepak-gatebook (226,240 points)
Answer:

Warning: count(): Parameter must be an array or an object that implements Countable in /home/customer/www/thegatebook.in/public_html/qa/qa-include/qa-theme-base.php on line 177

Warning: count(): Parameter must be an array or an object that implements Countable in /home/customer/www/thegatebook.in/public_html/qa/qa-include/qa-theme-base.php on line 177

Warning: count(): Parameter must be an array or an object that implements Countable in /home/customer/www/thegatebook.in/public_html/qa/qa-include/qa-theme-base.php on line 177
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