Overview: Introduction to overloading. Method overloading. Example program for method overloading.

1. PRESENTATION ON
OVERLOADING
Method Overloading 1tMyn

2. CONTENTS
Method Overloading 2tMyn
 Introduction to overloading
 Method overloading
 Example program for method overloading

3. Introduction to overloading
Method Overloading 3tMyn
 Overloading allows functions in computer
languages such as C++ and C# to have the same
function name but with different parameters.
 Overloading comes under static polymorphism.
 Static polymorphism can be achieved within the
class.

4.  The number of parameters and data type
of parameters must be different.It is showm
in the following example.
 Example:
Add()
Add(int i)
Add(int i,int j)
Add(int i,double j)
Add(double i,double j)
Method Overloading tMyn 4

5. Method overloading
 The process of creating more than one method in
a class with same name or creating a method in
derived class with same name as a method in
base class is called as method overloading.
In VB.net when you are overloading a method of
the base class in derived class, then you must use
the keyword “Overloads”.
But in C# no need to use any keyword while
overloading a method either in same class or in
derived class.
Method Overloading tMyn 5

6. While processing overloading methods, a
rule must be follow i.e, the overloaded
methods must differ either in number of
arguments they take or the data type of at
least one argument
Method overloading is commonly used to
create several methods with the same
name that perform the same or similar
tasks, but on different types or different
numbers of arguments.
6

7. EXAMPLE:
using System;
namespace ProgramCall
{
class Class1
{
public int Sum(int A, int B)
{
return A + B;
}
7

8. public float Sum(int A, float B)
{
return A + B;
}
}
class Class2 : Class1
{
public int Sum(int A, int B, int C)
{
return A + B + C;
}
}
l 8

9. class MainClass
{
static void Main()
{
Class2 obj = new Class2();
Console.WriteLine(obj.Sum(10, 20));
Console.WriteLine(obj.Sum(10,
15.70f));
Method Overloading tMyn 9

10. Console.WriteLine(obj.Sum(10, 20, 30));
Console.Read();
}
}
}
Output :
30
25.7
60
Method Overloading tMyn 10

11. The compiler distinguishes overloaded methods by their
signature :
 A combination of the method’s name ,data types and
order of its parameters.
 If the compiler looked only at method names during
compilation, the code in previous example would be
ambiguous.
 Overloaded method calls cannot be distinguished by
return type.
11