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Infix to Postfix program in java

Posted on December 1, 2021December 1, 2021 By christo No Comments on Infix to Postfix program in java

Complete program of Infix to Postfix program in java

import java.util.Stack;

public class InfixToPostfix {

    public static void main(String[] args) throws Exception {
        assert "32+".equals(infix2PostFix("3+2"));
        assert "123++".equals(infix2PostFix("1+(2+3)"));
        assert "34+5*6-".equals(infix2PostFix("(3+4)*5-6"));
    }

    public static String infix2PostFix(String infixExpression) throws Exception {
        if (!BalancedBrackets.isBalanced(infixExpression)) {
            throw new Exception("invalid expression");
        }
        StringBuilder output = new StringBuilder();
        Stack<Character> stack = new Stack<>();
        for (char element : infixExpression.toCharArray()) {
            if (Character.isLetterOrDigit(element)) {
                output.append(element);
            } else if (element == '(') {
                stack.push(element);
            } else if (element == ')') {
                while (!stack.isEmpty() && stack.peek() != '(') {
                    output.append(stack.pop());
                }
                stack.pop();
            } else {
                while (!stack.isEmpty() && precedence(element) <= precedence(stack.peek())) {
                    output.append(stack.pop());
                }
                stack.push(element);
            }
        }
        while (!stack.isEmpty()) {
            output.append(stack.pop());
        }
        return output.toString();
    }

    private static int precedence(char operator) {
        switch (operator) {
            case '+':
            case '-':
                return 0;
            case '*':
            case '/':
                return 1;
            case '^':
                return 2;
            default:
                return -1;
        }
    }
}
java Tags:Infix to Postfix, java

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