![]() If the token equals “ )”, pop out all the operators from the stack and append them to the postfix expression till an opening bracket i.e “ (” is found. If the token equals “ (”, push it onto the top of the stack. For each element ( operator / operand / parentheses ) of the tokenized infix expression stored in the list/queue repeat steps 3 up to 6. Push “ (” onto a stack and append “ )” to the tokenized infix expression list / queue. i.e Store each element i.e ( operator / operand / parentheses ) of an infix expression into a list / queue. Example: 2, 5, ^, 3, 4, -, *Īlgorithm to convert an Infix expression to a Postfix expression. ![]() Example: 2 ^ 5 * ( 3 - 4 )Ī postfix notation a.k.a reverse polish notation does not have precedence rules or the parentheses and the operator is positioned after the operands it needs to apply to. In an infix notation an operator is present between the operands, also the parentheses specify the sequence of operations. We refer standard or the conventional notation as the infix notation.
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