C++ Program using Infix Notation, HELP!

I need to write a program to evaluate
arithmetic expressions (using infix notation). The
easiest way to accomplish this is a two-step process:

· 
Convert the infix notation expression to the
equivalent expression in postfix notation.

· 
Evaluate the postfix notation.

The program needs to do the following:

· 
Prompt the user to submit an arithmetic expression.

o 
I may assume that the expression is entered with
spaces between all numbers and operators. 
That is, it will look like this:

 ( ( 7 + 6 ) * ( 16 – 2 ) ) / 2

Rather
than like this:

  ((7+6)*(6-2))/2

This
will make the reading in of the expression much easier.

· 
Evaluate the expression (using the two step process
above).

· 
Print the value of the expression for the user.

For example, running the program
might look like this:

Please enter an arithmetic expression: ( ( 7 + 6 ) * ( 16 – 2 ) ) / 2

The value of that expression is: 91

For this, I need one code
file: the file defining the program (called “main.cpp”).  I need to use the STL version of the stack
class. 

Please HELP ME!!!