Explain briefly Infix expression, Polish Notation and Reverse Polish Notation ?

==> Infix expression---

• The expression in which operator is placed in between operands
• Ex. a+b

==> Polish Notation---

•  - names after the Polish Mathematician Jan Lukasiewiez, refers to the expression in which the operator is placed before the operands also called prefix expression.
• Ex. +ab

==> Reverse Polish Notation---

• refers to the expression in which the operator is placed after the operands also called postfix expression or suffix Expression.
• Ex. ab+