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

C For Loop: Exercise-16 with Solution

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

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Sample Solution:

C Code:

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

int 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.

    if (n <= 0) {
        printf("Number of terms should be a positive integer.\n");
        return 1;  // Exit the program with an error code.
    }

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

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

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

    return 0;  // Return 0 to indicate successful execution.
}

Sample 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 

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