Method overloading

Methods can have the name but different parameter types.

The following code defines a class, Math.

Math has two methods with the same name. It is legal since the signatures are different.


using System;

class Math
{
    public static int add(int i, int j)
    {
        return i + j;
    }
    public static float add(float f, float f2)
    {
        return f + f2;
    }
}


class Program
{

    static void Main(string[] args)
    {
        Console.WriteLine(Math.add(1, 2));
        Console.WriteLine(Math.add(1.1F, 2.2F));

    }
}

params is not part of the signature.


class Math{
   static void sum(int[] anArray){
      
   }
   static void sum(params int[] anArray){
   
   }
}

Compile-time error


C:\g>csc Program.cs
Microsoft (R) Visual C# 2010 Compiler version 4.0.30319.1
Copyright (C) Microsoft Corporation. All rights reserved.

Program.cs(9,17): error CS0111: Type 'Math' already defines a member called
        'sum' with the same parameter types
Program.cs(5,17): (Location of symbol related to previous error)

The return type is not part of the signature.


class Math{
   int add(int i, int j){
      return i+j;
   }
   float add(int i, int j){
     return (float)(i+j);
   }

}

Compile-time error.


C:\g>csc Program.cs
Microsoft (R) Visual C# 2010 Compiler version 4.0.30319.1
Copyright (C) Microsoft Corporation. All rights reserved.

Program.cs(9,11): error CS0111: Type 'Math' already defines a member called
        'add' with the same parameter types
Program.cs(5,9): (Location of symbol related to previous error)

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