example problem

[mheidt]

I am trying to learn how to use BISON.  I have the manual for BISON Version 
1.25, have installed BISON-1.28, and am running on a SUN workstation.  I am 
trying to run the first example, Reverse Polish Notation Calculator, in the 
manual.

When I run a session with rpcalc, I get incorrect output.  For example, the 
following happens

4 9 +
      1.07394953e-314
      
I have checked every line of code for and error and believe I have typed the 
code just as it is in the manual.

I would appreciate it if someone could give me an idea of where to look for my 
error.

Thank you very much.

Mary Heidt