Function overloading

• A Function overloading can be compared with person overloading
• If a person has already some work to do and we are assigning additional work to the person then person will be overloaded
• In the same way, a function will have already some work to do and if we assign a different work to the same function, then we say function is overloaded
• A function will be overloaded in two situations
• When data types of the argument are changed
• When numbers of arguments are changed      

Definition

• Providing new implementation to a function with different signature is known as function overloading
• In general function overloading is implemented within the same class

When data types of the argument are changed

• Consider a function like

Sum(int a, int b)

             {

             }

• We can call the above functions by using two arguments like Add (1, 9)

• But if we want to call the above function by passing different data type value like Add (99.9, 8), we cannot use the above function and we overload the function like

             Sum (double a, int b)

            {

                    ….

                    ….

          }

When numbers of arguments are changed

• Consider a function like

           Sum (int a, int b)

           {

              ….

               ….

           }

• We can call the above function by passing two arguments like Add(1,9)

• If we want to call the above function with different number of argument like Add(1, 9, 44)

• We cannot use the above function and we overload our function and we overload the function like

         Add(int a, int b, int c)

        {

              ….

              ….

        }

Example:-

ClsFOExample

public  int Sum(int a,int b) public int Sum(int a, int b, int c) public double Sum(double a, int b)

using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace CAFOvedrloading {     class ClsFOExample     {         public  int Sum(int a,int b)         {             return a + b;         }         public int Sum(int a, int b, int c)         {             return a + b + c;         }         public double Sum(double a, int b)         {             return a + b;         }     }     class ClsFOverloading     {         static void Main(string[] args)         {             ClsFOExample obj1 = new ClsFOExample();             Console.WriteLine("sum of the two integer values is         :-  "+obj1.Sum(1,9));             Console.WriteLine("Sum of the three integer values is      :-  "+obj1.Sum(99.9,8));             Console.WriteLine("Sum of the one float value and one integer value is:-"+obj1.Sum(1,9,44));             Console.ReadLine();         }     } }

Output :-