C program to find sum of even numbers from 1 to n

Overview

In this post, we will develop a C program to find the sum of even numbers from 1 to n. To find the sum of even numbers we need to iterate the numbers from 1 to n.

C Program

#include 
int main()
{
    int n;
    //initialize sum variable
    int sum = 0;
    int i = 2;
    printf("Please input the number n:");
    scanf("%d",&n);
    while (i <= n)
    {
        sum = sum + i;
        i =i + 2;
    }
    printf("Sum of even numbers from 1 to n is:= %d\n", sum);
    return 0;
}

–

 

To find the sum we have initialized a variable sum to 0. We accumulate the sum of the even numbers from the range 1 to n.

To get the even number we will start with the 2 and in each iteration
we will increment the i variable with 2.

i = i + 2;

Sample Output

Please input the number n:15
Sum of even numbers from 1 to n is:= 56

 

 

The IDE used in the tutorial is Code:: Blocks.

To download and install Code Blocks follow the link:
https://www.testingdocs.com/download-and-install-codeblocks/

For more information on Code Blocks IDE, visit the official website of Code blocks IDE: http://www.codeblocks.org/