CIS 400  Assignment 1 
 
     For your first assignment you are to write an 
interpreter for the calculator language defined below. You 
may assume that there are no operator precedence rules if 
you wish. 
 
 
   ::=  |    
        ::=  |   
       ::=  |  .  
     ::=  |   
        ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 
         ::= + | - 
     ::= + | - | * | /  
 
 
     You may use any language you wish to do this 
assignment. You will need to devise a set of test strings to 
demonstrate the correctness of your work. You will need to 
turn in a clearly commented source listing of your program, 
listings of your test data files, and all relevant computer 
output. You will also need to write a 2 page memo describing 
your program and the results of your program testing.