In this post, you will learn ** how to Display Factors of a Number in C++** programming language.

This lesson will teach you how to Display Factors of a Number, with a recursion statement, mathematical operations and if statement using the C++ Language. Let’s look at the below source code.

## How to Display Factors of a Number?

RUN CODE SNIPPET## Source Code

#include <iostream> using namespace std; int recurSum(int n) { if (n <= 1) return n; return n + recurSum(n - 1); } int main() { int n; cin>>n; cout<<"Enter a positive number: "<<n<<endl; cout << "\nThe sum of first "<<n<<" numbers is: "<<recurSum(n); return 0; }

## Input

6

## Output

Enter a positive number: 6 The sum of first 6 numbers is: 21

The statements **#include<iostream>, using namespace std, int main** are the main factors that **support** the function of the source code. Now we can look into the working and layout of the code’s function.

**When function is called within the same function**, it is known as recursion. In this program we find out the sum of the first n numbers, using recursion.- In this code we have two sections, in the first one we declare the function
`int recurSum(int n)`

to initiate the recursive function, where we declare the variable**n**as an**integer.** - Using the
**if statement**assign the condition to verify if the value of n is greater than or equal to 1. Then return the value of**n**and perform the function`return n + recurSum(n - 1)`

. - Here the value of
**recursum**holds the range of the numbers used in the execution. The execution starts by default with**1**(n). The value is verified with the**if condition,**when the condition is true the value is returned using the**return function**and is used in the mathematical function`return n + recurSum(n - 1)`

. - The function is repeated with the recursion function till the condition is not true.
- The function then moves to the output section of the code, where we use output statements to display the answer stored in
`recurSum(n).`

**Note:** The **‘ << endl ‘ **in the code is used to **end the current line **and move to the next line and **‘\n’ **is also a **new line function,** to understand how both the functions work exclude it from the code, move it around and work with it.