public Parent() {
this.c1 = new child1();
this.c2 = new child2();
this.c3 = new child3();
this.c4 = new child4();
this.c5 = new child5();
}
static void Main(string[] args)
{
childclass ch = new childclass();
ch.sum();
child2 ch2 = new child2();
ch2.message();
child3 ch3 = new child3();
ch3.message();
}
