C++ program to Find Sum of n Natural Numbers using Recursion

What are Functions ?

Function is a block of statements that performs some operations. All C++ programs have at least one function – function called “main()”. This function is entry-point of your program.

A function declaration tells the compiler about a function’s name, return type, and parameters. A function definition provides the actual body of the function.

Defining a Function : :

The general form of a C++ function definition is as follows:

return_type Function_Name( list of parameters )
{
//function’s body
}

• return_type : suggests what the function will return. It can be void, int, char, some pointer or even a class object.
• Function_Name : is the name of the function, using the function name it is called.
• Parameters : are variables to hold values of arguments passed while function is called. A function may or may not contain parameter list.
• Function body : is he part where the code statements are written.

Below is the source code for C++ program to Find Sum of n Natural Numbers using Recursion which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

/* C++ program to Find Sum of n Natural Numbers using Recursion  */

#include<iostream>
using namespace std;

int add(int n);

int main()
{
    int n;

    cout << "\nEnter any positive integer :: ";
    cin >> n;

    cout << "\nThe Sum of natural numbers upto [ "<<n<<" ]  =  " << add(n)<<"\n";

    return 0;
}

int add(int n)
{
    if(n != 0)
        return n + add(n - 1);
    return 0;
}

OUTPUT : :

/* C++ program to Find Sum of n Natural Numbers using Recursion  */

Enter any positive integer :: 10

The Sum of natural numbers upto [ 10 ]  =  55

Process returned 0

Above is the source code for C++ program to Find Sum of n Natural Numbers using Recursion which is successfully compiled and run on Windows System.The Output of the program is shown above .