Answer / Hari Shankar Mehra

To convert postfix notation (RPN, Reverse Polish Notation) into prefix notation, you can use a stack-based algorithm. Here's an example algorithm based on Taha's method:
1. Initialize two empty stacks: output and operators.
2. Iterate through each token in the postfix expression.n - If the token is an operand (e.g., numbers or symbols like +, -, *, /), push it onto the output stack.n - If the token is an operator, pop two operands from the output stack and apply the operator on them. Then, push the result back onto the output stack.
3. The final result will be in the output stack.

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