static void Main(string[] args)
{
ExtensionMethod1 ex = new ExtensionMethod1();
ex.Demo1();
ex.Demo2();
ex.Demo3("veerababu");
Console.WriteLine(Math.Sqrt(9));
int i = 7;
Console.WriteLine(i.prime());
string s = "veerababu rallabandi";
Console.WriteLine(s.reverse());
//structure purpose
structure st = new structure();
st.show1();
st.show2();
}
