Determine if a string consists entirely of digits

Declared in file: hzTextproc.h
Defined in file : hzTypes.cpp

Function Logic:

Function body:

bool IsAllDigits (const char* tok)
{
   //  Category: Text Processing
   //  
   //  Determine if a string consists entirely of digits
   //  
   //  Arguments: 1) tok The token
   //  
   //  Returns: True If token is alphanemeric
   //     False If string of zero length or contains non digit chars
   const char* i ;     //  Input string iterator
   if (!tok || !tok[0])
       return false ;
   for (i = tok ; *i && *i >&eq; ''0''&&*i <&eq; ''9'';i++) ;
   return *i ? false : true ;
}