利用fgets代替gets

fgets (pn->first, SLEN, stdin);
 i = 0;
 while (pn->first[i] != '/n' && pn->first[i] != '/0')
  i++;
 if (pn->first[i] == '/n')
  pn->first[i] = '/0';
 else
  while (getchar () != '/n')
   continue;