PA0465 Console Scientific Calculator Program

                                                         
   These are the special functions currently supported by
   the free form expression evaluator:                   
                                                         
          1) SIN(X)             11) SIGN(X)              
          2) COS(X)             12) INT(X)               
          3) TAN(X)             13) NINT(X)              
          4) ASIN(X)            14) ABS(X)               
          5) ACOS(X)            15) SINH(X)              
          6) ATAN(X)            16) COSH(X)              
          7) LOG(X)             17) TANH(X)              
          8) LOG10(X)                                    
          9) EXP(X)                                      
         10) SQRT(X)                                     
                                                         
   Arguments for trigonometric functions are interpreted 
   based on the degree/radian flag on line 16.