#include <string.h>
#include <iostream>
        using namespace std;


int main(void)
{
  char s1[] = "This is a pen.     Hello-World...";
  char s2[] = " -.";  /* ??+?n?C?t??+?s???I?h */
  char *tok;

  tok = strtok( s1, s2 );
  cout<<"tok before="<<tok<<endl;
  tok = strtok( 0, s2 );
  cout<<"tok before="<<tok<<endl;
  tok = strtok( 0, s2 );
  cout<<"tok before="<<tok<<endl;
  tok = strtok( 0, s2 );
  cout<<"tok before="<<tok<<endl;
  tok = strtok( 0, s2 );
  cout<<"tok before="<<tok<<endl;
  tok = strtok( NULL, s2 );
  cout<<"tok before="<<tok<<endl;
  tok = strtok( NULL, s2 );
  cout<<"tok before="<<tok<<endl;

  return 0;
}

==============================================
$ ./a.exe
tok before=This
tok before=is
tok before=a
tok before=pen
tok before=Hello
tok before=World
tok before=