# INFIX PREFIX POSTFIX CONVERSION PDF

Postfix : Prefix :. Note: Do not use spaces in expression. Postfix : Prefix : By Raj. Expression Stack Postfix.

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Postfix : Prefix :. Note: Do not use spaces in expression. Postfix : Prefix : By Raj. Expression Stack Postfix. Algorithm used Postfix Step 1: Add '' " to the end of the infix expression Step 2: Push o nto the stack Step 3: Repeat until each character in the infix notation is scanned IF a is encountered, push it on the stack IF an operand whetheradigit oracharacter is encountered, add it postfix expression. IF a " " is encountered, then a. Repeatedly pop from stack and add it to the postfix expression until a " " is encountered.

Discard the " ". That is, remove the from stack and do not add it to the postfix expression IF an operator O is encountered, then a. Repeatedly pop from stack and add each operator popped from the stack to the postfix expression which has the same precedence orahigher precedence than O b.

Note that while reversing the string you must interchange left and right parentheses. Step 2: Obtain the postfix expression of the infix expression Step 1. Step 3: Reverse the postfix expression to get the prefix expression.

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## Infix -> Postfix & Prefix

This type of notation is referred to as infix since the operator is in between the two operands that it is working on. Which operands do they work on? The expression seems ambiguous. In fact, you have been reading and writing these types of expressions for a long time and they do not cause you any problem. Each operator has a precedence level.

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## Convert Infix To Prefix Notation

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. 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.

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## Converting between these notations : Example

While we use infix expressions in our day to day lives. Computers have trouble understanding this format because they need to keep in mind rules of operator precedence and also brackets. Prefix and Postfix expressions are easier for a computer to understand and evaluate. Given two operands and and an operator , the infix notation implies that O will be placed in between a and b i. When the operator is placed after both operands i.