🚀 go-pugleaf

In <1430.1034.uupcb@idcbbs.com> Claudio Fahey writes:
> I'm trying to write a program with the IBM C Set/2.  Every
> once in a while, the program just terminates when I perform
> a specific action.  IPMD ( the debugger ) tells me that it
> gets a floating point underflow on a line such as this:
>     LONG rc; float Temp;
>         rc = Temp * NUMCOLORS/MAXTEMP;
>         When I trace into it, Temp is around 1e-40 and NUMCOLORS/MAXTEMP is
>         around 0.93.  Why is it giving me this error?  Why doesn't it just
>         set rc to 0?  How can I avoid this problem?  Thanks.

Underflow trapping is set on by default.  To turn it off, add the
following line to your program:

  _control87( EM_UNDERFLOW, EM_UNDERFLOW );

dave

-------------------------------------------------------------------------
Dave Mooney                                              dmm@vnet.ibm.com
 C Set/2 Development, IBM Canada Lab, 844 Don Mills Rd, Toronto, Ontario
          "Now we can talk to cheese anywhere in the world!!!"