# Calculate Series Summation Using the for Loop in C++

In this tutorial, we will learn how to calculate the sum of a series using a `for` loop in C++. But, let’s first discuss the concept of the `for` loop.

## the `for` Loop in C++

The `for` loop is a control flow statement in C++ that allows us to iterate over a series of values. The syntax of the `for` loop is as follows:

``````for (initializer; condition; incrementer) {
statement(s);
}
``````

There are three parts in the `for` loop syntax: `initializer`, `condition`, and `incrementer`. Semicolons separate all three parts.

The `initializer` is executed before the loop starts, and it usually sets up variables that will be used later on in the body of the loop. The `condition` is evaluated before each iteration and decides whether to continue or break out of the loop.

The `incrementer` can update a variable after each iteration.

## Steps to Calculate Series Summation Using the `for` Loop in C++

The following steps are needed to calculate the sum of a series using a `for` loop in C++:

• ##### Lastly, print out the final sum.

Let’s discuss an example of calculating the sum of the series using a `for` loop by applying the abovementioned steps.

``````#include<iostream>
using namespace std;
int main()
{
int sum = 0;
for (int i = 1; i < 10; i += 2) {
cout << i << '+';
sum += i;
}
cout << "\n sum of series using for loop: " << sum << endl;
return 0;
}
``````

Click here to check the working of the code as mentioned above.

Write for us
DelftStack articles are written by software geeks like you. If you also would like to contribute to DelftStack by writing paid articles, you can check the write for us page.

## Related Article - C++ Math

• Convert Radians to Degrees in C++
• Find the Square Root Without Using the SQRT Function in C++
• Recursive Fibonacci in C++