Hola Kurt!
 KT>        Does Visual C++ have a similar function?  If so, in what header
 KT> file is it located and what is the name of the function?  If not,
 KT> would someone please show me a function to determine the sign of a
 KT> number which would return 1 if positive, 0 if zero, and -1 if
 KT> negative...?
   I think you are a little lazy Ļaren't you? The program is very easy.
try something like this (I haven't tested it and I have written it in here as 
I'm thinking on it)
template
int sign(tipo x)
    {
    if (x>0) return(1);
    if (x<0) return(-1);
    if (x=0) return(0);
    }
Using a Template you can use any type for the number to compare  Ej:
    char a;
    int  b;
    float c;
    sign(a);
    sign(b);
    sign(c);
  You can call the function with any type of parameter.
 KT>        Thanks,
   Not at all.  ;)
 KT>        kjt
   What do you mean "kjt"?  :-?  :-P
Un saludo
     Rafa
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