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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.

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

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

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