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Commit25b3ff4

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Merge pull requestTheAlgorithms#1964 from TheAlgorithms/infix2posfix
Infix2posfix
2 parents2e6c7b4 +6015137 commit25b3ff4

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‎.github/workflows/checkstyle.yml‎

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-name:Commit Format changes
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if:failure()
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run:|
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git diff
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git config --global user.name github-actions
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git config --global user.email '${GITHUB_ACTOR}@users.noreply.github.com'
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git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/$GITHUB_REPOSITORY

‎DIRECTORY.md‎

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* Stacks
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*[BalancedBrackets](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/BalancedBrackets.java)
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*[DecimalToAnyUsingStack](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/DecimalToAnyUsingStack.java)
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*[InfixToPostfix](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/InfixToPostfix.java)
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*[NodeStack](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/NodeStack.java)
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*[StackArray](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/StackArray.java)
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*[StackArrayList](https://github.com/TheAlgorithms/Java/blob/master/DataStructures/Stacks/StackArrayList.java)
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packageDataStructures.Stacks;
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importjava.util.Stack;
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publicclassInfixToPostfix {
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publicstaticvoidmain(String[]args)throwsException {
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assert"32+".equals(infix2PostFix("3+2"));
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assert"123++".equals(infix2PostFix("1+(2+3)"));
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assert"34+5*6-".equals(infix2PostFix("(3+4)*5-6"));
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}
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publicstaticStringinfix2PostFix(StringinfixExpression)throwsException {
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if (!BalancedBrackets.isBalanced(infixExpression)) {
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thrownewException("invalid expression");
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}
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StringBuilderoutput =newStringBuilder();
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Stack<Character>stack =newStack<>();
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for (charelement :infixExpression.toCharArray()) {
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if (Character.isLetterOrDigit(element)) {
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output.append(element);
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}elseif (element =='(') {
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stack.push(element);
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}elseif (element ==')') {
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while (!stack.isEmpty() &&stack.peek() !='(') {
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output.append(stack.pop());
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}
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stack.pop();
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}else {
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while (!stack.isEmpty() &&precedence(element) <=precedence(stack.peek())) {
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output.append(stack.pop());
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}
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stack.push(element);
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}
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}
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while (!stack.isEmpty()) {
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output.append(stack.pop());
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}
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returnoutput.toString();
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}
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privatestaticintprecedence(charoperator) {
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switch (operator) {
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case'+':
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case'-':
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return0;
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case'*':
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case'/':
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return1;
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case'^':
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return2;
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default:
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return -1;
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}
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}
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}

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