using System; class RefTest { /* This method changes its argument. Notice the use of ref. */ public void sqr(ref int i) { i = i * i; } } class MainClass { public static void Main() { RefTest ob = new RefTest(); int a = 10; Console.WriteLine("a before call: " + a); ob.sqr(ref a); // notice the use of ref Console.WriteLine("a after call: " + a); } }
a before call: 10 a after call: 100