👉 In computer science, a postfix notation is a way of writing down mathematical expressions in which operations are performed from left to right. In other words, an expression written in postfix notation has its operands (numbers) placed first and their operators (addition, subtraction, multiplication, division) placed after them.
For example, the postfix expression "3 + 2
4 / 5" would be written as: `3 + 2
4 / 5`.
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