What is a postfix expression?

• Postfix also known as Reverse Polish Notation (or RPN), is a notational system where the operation/function follows the arguments.
  Infix notation is:
  (((1 + 2) * 3) + 6) / (2 + 3)
  Postfix notation will be:
  1 2 + 3 * 6 + 2 3 + /
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• postfix expression means expression in which operators are lies at end of expression.
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• Postfix notation is a notation for writing arithmetic expressions in which the operands appear before their operators.
  Let the arithmetic expression be a+b ,where a and b are operands and + is an operator .
  the postfix expression for the above is : ab+
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