# Postfix to Prefix notation Algorithm and Flowchart

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Prefix notation is a type of notation in which arithmetic expressions are written in a manner such that the operands appear after their operators.

Postfix notation is a type of notation in which arithmetic expressions are written in a manner such that the operands appear before their operators.

Let's see how to convert Postfix Notation to Prefix Notation.

### Algorithm for Postfix to Prefix Conversion:

Step 1: Start Step 2: Read the Postfix expression from left to right. Step 3: If the scanned character is an operand, then push it onto the Stack. Step 4: If the scanned character is an operator, pop two operands from the stack and concatenate them in order of 'operator, operand2, operand1'. Push the result into the stack. Step 5: Repeat steps 2-4 until the postfix expression ends. Step 6: Pop all the rest elements of the stack if any. Step 7: Stop

Let's take an example to understand cb+a*,

1. Reading from left to right, we scan the operands 'c' 'b' respectively and push it into the the stack.
2. '+' is scanned and operands 'c', 'b' are popped and concatenated in form of +bc
3. 'a' is then pushed into the stack.
4. '*', is encountered and 'a' and string '+bc' is popped and concatenated to give a string *a+bc
5. Postfix form is obtained: *a+bc

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