C++ Function or Method overloading Beginner Programming

Animated Gif of function overloading

C++ function overloading

A function is a set of different statements which is use to perform a specific task.If you want to pass any user value in function arguments then it must declare variables that accept the values of the arguments. These variables are known as parameters of the function.

In C++ we can declare more than one function having same name but  differ in parameters size and datatype and implementation, which is called function overloading.
when we call a function or pass an argument in an overloaded function on that spot compiler search for most appropriate definition by comparing the parameter types we use in overloaded function.
functions written by programmer In C++ program to perform a specific task depends on programmer requirements like addition between 2 or more numbers are known as User Define functions.

functions use to divide and organize our program in different functions which is helpful for finding errors if any appear during programming.
we declare a function using return type, function name and parameters.
Syntax of declaring function is very simple

returnType functionName (int para1,int para2)

{

  // function statements

}

returnType functionName (double para1,double para2)

{

  // function statements

}

ReturnType

return type of a function tells compiler that what kind of value this function is going to return for example if we use int as a return type of a function it'll return an integer value. void return nothing.

FunctionName

programmer define name of a function and parameters to make a function signature.

Parameter & Argument

while declaring a function we declare parameters in function signature and when we call function in to execute we'll pass argument in function calling.A parameter is a placeholder. When a function is called, we pass an argument to the function.

first we need to use function signature at the top and implement function body wherever u want in program

Syntax of function overloading is very simple

int Add(int para1,int para2); // signature with parameter
int main(){
   Add(10,20); // calling & passing argument
}
int Add(int para1,int para2){
 return (para1+para2);
}

Example

Functions having same Name

Parameter

1. #include <iostream>  
2. using namespace std;
3. class Addition{
4. public:
5.    int Add(int x,int y){
6.      return ( x + y );
7.    }
8.    double Add(double x,double y){
9.      return ( x + y );
10.    }
11.    string Add(string x,string y){
12.      return ( x + y );
13.    }
14. };
15. 
    
16. int main( ){
17.  Addition ad;
18.  cout<<"Integer Addition = "<<ad.Add(20,30)<<endl; //Arguments
19.  cout<<"Double Addition = "<<ad.Add(10.5,10.5)<<endl;
20.  cout<<"String Addition = "<<ad.Add("ITech","Taleem");
21.  return 0;
22. }

Console :

50

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