Pass references to methods : Parameter Reference « Language Basics « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Language Basics
3. Parameter Reference

using System; 
 
class MyClass {  
  int a, b; 
  
  public MyClass(int i, int j) {  
    a = i;  
    b = j;  
  }  
  
  /* Return true if ob contains the same values as the invoking object. */ 
  public bool sameAs(MyClass ob) {  
    if((ob.a == a) & (ob.b == b)) 
       return true;  
    else return false;  
  }  
 
  public void copy(MyClass ob) { 
    a = ob.a; 
    b  = ob.b; 
  } 
 
  public void show() { 
    Console.WriteLine("a: {0}, b: {1}", 
                      a, b); 
  } 
}  
  
class MainClass {  
  public static void Main() { 
    MyClass ob1 = new MyClass(4, 5);  
    MyClass ob2 = new MyClass(6, 7);  
  
    Console.Write("ob1: "); 
    ob1.show(); 
 
    Console.Write("ob2: "); 
    ob2.show(); 
 
    if(ob1.sameAs(ob2))  
      Console.WriteLine("ob1 and ob2 have the same values."); 
    else 
      Console.WriteLine("ob1 and ob2 have different values."); 
 
    Console.WriteLine(); 
 
    // now, make ob1 a copy of ob2 
    ob1.copy(ob2); 
 
    Console.Write("ob1 after copy: "); 
    ob1.show(); 
 
    if(ob1.sameAs(ob2))  
      Console.WriteLine("ob1 and ob2 have the same values."); 
    else 
      Console.WriteLine("ob1 and ob2 have different values."); 
 
  }  
}

ob1: a: 4, b: 5
ob2: a: 6, b: 7
ob1 and ob2 have different values.

ob1 after copy: a: 6, b: 7
ob1 and ob2 have the same values.