Operators indicate the operation to be carried out on operands. There are two kinds of operators namely unary and binary . Unary operators require one operand to carry out the intended operation whereas binary operators requires two operands to carry out the intended operation.
Most operators are binary.
In infix notation , the operator is written in between the operands it operates on as in the case of binary operators. Our world is accustomed to infix notation. However, algorithmically, postfix notation are easier to evaluate than infix notation. Hence, what is of interest to us is the conversion from infix to postfix notation. The following illustrates the evaluation of a postfix notation.