C++ I/O Tip 1: How to skip comments

#include <limits> // for std::numeric_limits
#include <string> // for std::string
#include <iostream> // I/O
#include <fstream>// file I/O

// Remove C/C++ comments
ifstream& SkipComment(ifstream &strm)
{
   char c;
   const int c_MAX_LINESIZE=std::numeric_limits<int>::max();

   if(!strm) return strm;

   while(isspace(c=strm.get())||c==','||c==';');

   if(c=='#'||c=='%'||(c=='/' && strm.peek()=='/'))
   {
     //skip the rest of the line
     strm.ignore(c_MAX_LINESIZE, '\n');
     return strm;
 
   }
   else if (c=='/' && strm.peek()=='*')
   {
     //skip everything in the comment block
     c=strm.get();          //skip the first '*'
     char last='\0';
     while(!(strm.eof())&&strm.good())
     {
       c=strm.get();
       if(c=='/'&&last=='*')break;
       else last=c;
     }
      return strm;
 
 }
 else if(c!=EOF)
 {
     strm.putback(c);
 }

 return strm;
}

//main program
int main(int argc,char **argv)
{
      string IFile="test.dat";
      ifstream ifs( IFile.c_str() );
      if ( ! ifs ){cerr << "Unable to open " << IFile << " for reading\n";}
      SkipComment(ifs)>>x;
      SkipComment(ifs)>>y;
      ifs.close();
      return 0;
}