Data Structures | Stack | Question 4

Consider the following pseudocode that uses a stack

   declare a stack of characters
   while ( there are more characters in the word to read )
   {
      read a character
      push the character on the stack
   }
   while ( the stack is not empty )
   {
      pop a character off the stack
      write the character to the screen
   }

What is output for input “geeksquiz”?

(A) geeksquizgeeksquiz
(B) ziuqskeeg
(C) geeksquiz
(D) ziuqskeegziuqskeeg


Answer: (B)

Explanation: Since the stack data structure follows LIFO order. When we pop() items from stack, they are popped in reverse order of their insertion (or push())






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