You can work on this problem by yourself or with your group, but a solution must be submitted to the autograder for each individual. The fixity of an operator describes its position relative to its operands. A prefix operator precedes its operands and a postfix operator follows them. In the case of operators that operate on exactly two operands, we can also say that an infix operator appears between its operands. An example of each: $3$ The one$-$operand minus sign for negation is a prefix operator $4!$ The exclamation mark for factorial is a postfix operator $5+6$ The plus sign for addition is an infix operator Your task, however, is to evaluate expressions written in anyfix notation, meaning any operator can act as a prefix, postfix, or infix