81 lines
2.3 KiB
Java
81 lines
2.3 KiB
Java
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/*This is a Java Program to Check for balanced parenthesis by using Stacks. Parenthesis matching is commonly used for evaluating arithmetic expressions and in editors for validating syntax.*/
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/*
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* Java Program to Check for balanced paranthesis by using Stacks
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*/
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import java.util.*;
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public class ParenthesisMatching
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{
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public static void main(String[] args)
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{
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Scanner scan = new Scanner(System.in);
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/* Creating Stack */
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Stack<Integer> stk = new Stack<Integer>();
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System.out.println("Parenthesis Matching Test\n");
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/* Accepting expression */
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System.out.println("Enter expression");
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String exp = scan.next();
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int len = exp.length();
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System.out.println("\nMatches and Mismatches:\n");
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for (int i = 0; i < len; i++)
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{
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char ch = exp.charAt(i);
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if (ch == '(')
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stk.push(i);
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else if (ch == ')')
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{
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try
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{
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int p = stk.pop() + 1;
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System.out.println("')' at index "+(i+1)+" matched with ')' at index "+p);
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}
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catch(Exception e)
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{
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System.out.println("')' at index "+(i+1)+" is unmatched");
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}
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}
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}
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while (!stk.isEmpty() )
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System.out.println("'(' at index "+(stk.pop() +1)+" is unmatched");
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}
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}
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/*
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Enter expression
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(a+(b*c)-d)
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Matches and Mismatches:
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')' at index 8 matched with ')' at index 4
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')' at index 11 matched with ')' at index 1
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Parenthesis Matching Test
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Enter expression
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((x+y/(z-w))
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Matches and Mismatches:
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')' at index 11 matched with ')' at index 7
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')' at index 12 matched with ')' at index 2
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'(' at index 1 is unmatched
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Parenthesis Matching Test
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Enter expression
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(a+b*(c-d)-(e-f/(g+h*(k-i)/(l-j+k
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Matches and Mismatches:
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')' at index 10 matched with ')' at index 6
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')' at index 26 matched with ')' at index 22
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'(' at index 28 is unmatched
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'(' at index 17 is unmatched
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'(' at index 12 is unmatched
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'(' at index 1 is unmatched
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