In JAVA!

public static boolean isOperand(char x) ( 2 pt)

takes a symbol as argument and returns true if the symbol is an operand otherwise it returns false ( 2 pts)

public static int operPrecedence(char oper) (2 pts)takes an operator as argument and returns a precedence value for the operator ( 3 pts)

precedence value is 1 for + or -

precedence value is 2 for * or /

precedence value is 3 for $

public static boolean precedence(char top, char symb) ( 6 pts)Takes two arguments, the symbol at the top of the operator stack and the symb read from the infix string and determines the precedence based on the following rules:

When a ( is scanned, no operator is popped off and the ( is pushed on the stack. The consequence is that the operators prior to this ( will not be compared with the operators after this (. E.g. precedence(op,()=false;

The first operator after the ( must be pushed on the stack on top of the (. precedence((,+)=false.

When ) is scanned, all the operators within the parentheses on the stack must be popped off. precedence(op,))=true, except op=( because precedence((,+)=false

When ) is scanned, the corresponding ( should be popped off

This method uses the operPrecedence method