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Infix and Reverse Polish notation

Comparison of infix expression (A + B) * C and RPN expression A B + C *, showing the sub-expression A + B transformed before multiplication

Most expressions you already know are written in infix notation, where the operator sits between its operands, such as $A + B$ . Reverse Polish notation, also called postfix notation, moves the operator after the operands, so $A + B$ becomes $A B +$ .

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Infix and Reverse Polish notation

Comparison of infix expression (A + B) * C and RPN expression A B + C *, showing the sub-expression A + B transformed before multiplication

Most expressions you already know are written in infix notation, where the operator sits between its operands, such as $A + B$ . Reverse Polish notation, also called postfix notation, moves the operator after the operands, so $A + B$ becomes $A B +$ .

Reverse Polish Lesson

Reverse Polish Lesson