key.cpp

数据结构与程序设计教材源码 数据结构与程序设计教材源码

 
void Key::make_blank()
{
   if (entries != NULL) delete []entries;
   length = 0;
   entries = new char[length + 1];
   strcpy(entries, "");
}
 
Key::Key()
{
   make_blank();
}
 
char Key::key_letter(int position) const
{
   if (position >= 0 && position < length) return entries[position];
   else return ' ';
}
 
Key::Key(const char *copy): String(copy)
{
}