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Data Structures | Stack | Question 1

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  • Difficulty Level : Easy
  • Last Updated : 08 Jan, 2013

Following is C like pseudo code of a function that takes a number as an argument, and uses a stack S to do processing.

void fun(int n)
    Stack S;  // Say it creates an empty stack S
    while (n > 0)
      // This line pushes the value of n%2 to stack S
      push(&S, n%2);
      n = n/2;
    // Run while Stack S is not empty
    while (!isEmpty(&S))
      printf("%d ", pop(&S)); // pop an element from S and print it

What does the above function do in general?
(A) Prints binary representation of n in reverse order
(B) Prints binary representation of n
(C) Prints the value of Logn
(D) Prints the value of Logn in reverse order

Answer: (B) Explanation: See method 2 of for explanation.

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