Answered: Which of the following program prints…

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

Problem 1PE

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Question

Which of the following program prints the index of every matching parenthesis?
a)

public void dispIndex(String exp) { Stack<Integer> stk = new Stack<Integer>(); for (int i = 0; i < len; i++) { char ch = exp.charAt(i); if (ch == '(') stk.push(i); else if (ch == ')') { try { int p = stk.pop() + 1; System.out.println("')' at index "+(i+1)+" matched with ')' at index "+p); } catch(Exception e) { System.out.println("')' at index "+(i+1)+" is unmatched"); } } } while (!stk.isEmpty() ) System.out.println("'(' at index "+(stk.pop() +1)+" is unmatched"); }

public void dispIndex(String exp) { Stack<Integer> stk = new Stack<Integer>(); for (int i = 0; i < len; i++) { char ch = exp.charAt(i); if (ch == '(') stk.push(i); else if (ch == ')') { try { int p = stk.pop() + 1; System.out.println("')' at index "+(i)+" matched with ')' at index "+p); } catch(Exception e) { System.out.println("')' at index "+(i)+" is unmatched"); } } } while (!stk.isEmpty() ) System.out.println("'(' at index "+(stk.pop() +1)+" is unmatched"); }

public void dispIndex(String exp) { Stack<Integer> stk = new Stack<Integer>(); for (int i = 0; i < len; i++) { char ch = exp.charAt(i); if (ch == ')') stk.push(i); else if (ch == '(') { try { int p = stk.pop() +1; System.out.println("')' at index "+(i+1)+" matched with ')' at index "+p); } catch(Exception e) { System.out.println("')' at index "+(i+1)+" is unmatched"); } } } while (!stk.isEmpty() ) System.out.println("'(' at index "+(stk.pop() +1)+" is unmatched"); }

public void dispIndex(String exp) { Stack<Integer> stk = new Stack<Integer>(); for (int i = 0; i < len; i++) { char ch = exp.charAt(i); if (ch == ')') stk.push(i); else if (ch == '(') { try { int p = stk.pop(); System.out.println("')' at index "+(i+1)+" matched with ')' at index "+p); } catch(Exception e) { System.out.println("')' at index "+(i+1)+" is unmatched"); } } } while (!stk.isEmpty() ) System.out.println("'(' at index "+(stk.pop() +1)+" is unmatched"); }

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