# What is postfix with example?

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## What is postfix with example?

For example, the infix expression (2+3)*(4+5) in postfix notation is 23+45+* and the infix expression 2+3*4+5 in postfix notation is 234*+5+. Also, since our four operators are left associative, 2 + 3 + 4 translates to 23+4+ and not 234++.

## What is meant by postfix expression?

A postfix expression is a collection of operators and operands in which the operator is placed after the operands. That means, in a postfix expression the operator follows the operands.

## What is postfix and infix Java?

Infix expressions are the expression where operators are written in between every pair of operands. It is the usual way to write an expression. For Ex: An expression like A + B is Infix. Postfix expressions are the expressions where operands precede operators. Here operators are written after operands.

## Where is postfix used?

The Postfix notation is used to represent algebraic expressions. The expressions written in postfix form are evaluated faster compared to infix notation as parenthesis are not required in postfix.

## How does postfix work?

Prefix expression notation requires that all operators precede the two operands that they work on. Postfix, on the other hand, requires that its operators come after the corresponding operands. The multiplication operator comes immediately before the operands B and C, denoting that * has precedence over +.

## Is postfix an expression?

Postfix: An expression is called the postfix expression if the operator appears in the expression after the operands. Simply of the form (operand1 operand2 operator). Given a Prefix expression, convert it into a Postfix expression.

## What is a postfix in Java?

Postfix notation represents algebraic expressions. As postfix is an operation of stack it does not need parenthesis. Most of thee complex algebraic expression can be easily solved with the help of postfix notation. So let’s start learning postfix evaluation in Java.

## What is postfix and infix?

Infix expressions are those expressions in which the operator is written in-between the two or more operands. Usually, we use infix expression. For example, consider the following expression. Postfix expressions are those expressions in which the operator is written after their operands.

## How to evaluate expression in Java?

Create a stack to store operands (or values).

• Scan the given expression and do following for every scanned element.
• the number in the stack is the final answer

## What is the prefix for expression?

Prefix : An expression is called the prefix expression if the operator appears in the expression before the operands. Simply of the form (operator operand1 operand2). Example : *+AB-CD ( Infix : (A+B) * (C-D) )