C Exercises: Calculate n terms of even natural number and their sum

Last update on March 18 2025 13:35:43 (UTC/GMT +8 hours)

16. Sum of Even Natural Numbers

Write a C program to display the sum of n terms of even natural numbers.

This C program calculates and displays the sum of the first n even natural numbers. By iterating through even numbers up to the specified limit, the program accumulates their sum, demonstrating the use of loops and arithmetic operations in C. This task highlights the ability to handle sequences and perform basic summation tasks programmatically.

Visual Presentation:

Calculate n terms of even natural number and their sum

Sample Solution:

C Code:

#include <stdio.h>  // Include the standard input/output header file.

void main()
{
   int i, n, sum = 0;  // Declare variables 'i' for loop counter, 'n' for user input, 'sum' to store the sum.

   printf("Input number of terms : ");  // Prompt the user to input the number of terms.
   scanf("%d", &n);  // Read the value of 'n' from the user.

   printf("\nThe even numbers are :");  // Print a message.

   for(i = 1; i <= n; i++)  // Start a loop to generate even numbers.
   {
     printf("%d ", 2 * i);  // Print the even number.
     sum += 2 * i;  // Add the even number to the sum.
   }

   printf("\nThe Sum of even Natural Number upto %d terms : %d \n", n, sum);  // Print the sum of even numbers.
}

Output:

Input number of terms : 5                                                                                     
                                                                                                              
The even numbers are :2 4 6 8 10                                                                              
The Sum of even Natural Number upto 5 terms : 30

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to display even natural numbers up to n and compute their product instead of sum.
Write a C program to calculate the sum of even natural numbers up to n and then determine their average.
Write a C program to compute the sum of even natural numbers recursively.
Write a C program to sum even natural numbers up to n while skipping numbers that are multiples of 4.

C Programming Code Editor:

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