Then, the Class Implementation
	string::string() {      str[0]=‘\0’;     len = 0; } int string::copy(char s []) [    if (strlen(s) < 20)        strcpy (str, s);    else {        for (int i = 0; i< 20; ++i)          str[i] = s[i];        str[20]=‘\0’;    len = strlen(str);   return len; }