to_string
Description:
[ CCode ( cname = "g_strdup_printf" ,  instance_pos = -1 ) ]
public string to_string (string format = "%" + FORMAT)
  public string to_string (string format = "%" + FORMAT)
Converts the value to its equivalent string representation
Example: Uint64 to string:
public static int main () {
	uint64 num = 1000;
	print ("%s\n", num.to_string ());
	return 0;
}valac --pkg glib-2.0 uint64.to_string.vala