enemy = choose(1,2,3)
    switch(enemy)
    {
    //1 enemies randomize x
    case 1:instance_create(random_range (24,room_width - 24),0, obj_enemy);break;
    //2 enemuies randomized x and y
    case 2:instance_create(random_range (24,room_width - 24),random_range(-30, 0), obj_enemy);
           instance_create(random_range (24,room_width - 24),random_range(-30, 0), obj_enemy);break;
     //3 enemies randomized x and y
    case 3:instance_create(random_range (24,room_width - 24),random_range(-30, 0), obj_enemyattacker);
           instance_create(random_range (24,room_width - 24),random_range(-30, 0), obj_enemy);
           instance_create(random_range (24,room_width - 24),random_range(-30, 0), obj_enemyattacker);break;


    }