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14 May, 14:32

Let s be a stack. Consider the following program:

s. push (1);

s. push (2);

s. push (3);

s. pop ();

s. push (4);

s. pop ();

s. pop ();

int x = s. peek ();

What is the value of x after the assignment statement?

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Answers (1)
  1. 14 May, 16:13
    0
    Hi

    In the first scenario we have

    S = []

    then:

    S=[1],

    S=[2,1]

    S=[3,2,1]

    S=[2,1]

    S=[4,2,1]

    S=[2,1]

    S=[1]

    So when it's call the method peek to S, X will be assigned 1

    Explanation:

    Stack is a linear data structure which follows a particular order in which the operations are performed. The order may be LIFO (Last In First Out). There are many real-life examples of a stack. Consider an example of plates stacked over one another in the canteen. (Taken from wikipedia)

    - The method push is to put the element on the top of the stack

    - The method pop is take out the top element of the stack

    - The method peek is to see what is the top element of the stack
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