C Program: Sum of Cubes of Even Numbers up to 20 using While loop

Last update on July 29 2025 12:58:14 (UTC/GMT +8 hours)

8. Sum of Cubes of Even Numbers Up to a Limit

Write a C program that calculates and prints the sum of cubes of even numbers up to a specified limit (e.g., 20) using a while loop.

Sample Solution:

C Code:

#include <stdio.h>

int main() {
    int limit = 20;  // Specify the limit for even numbers
    int num = 2;     // Start with the first even number
    int sum = 0;     // Variable to store the sum of cubes

    // Start a while loop to iterate through even numbers up to the limit
    while (num <= limit) {
        // Calculate the cube of the current even number
        int cube = num * num * num;
        
        // Add the cube to the sum
        sum += cube;

        // Move to the next even number
        num += 2;
    }

    // Print the sum of cubes of even numbers
    printf("Sum of cubes of even numbers up to %d: %d\n", limit, sum);

    return 0;  // Indicate successful program execution
}

Sample Output:

Sum of cubes of even numbers up to 20: 24200

Explanation:

Here are key parts of the above code step by step:

#include <stdio.h>: Include the standard input-output library for functions like "printf()".
int main() {: Start the main function.
int limit = 20;: Specify the limit for even numbers.
int num = 2;: Start with the first even number.
int sum = 0;: Initialize a variable to store the sum of cubes.
while (num <= limit) {: Start a while loop to iterate through even numbers up to the limit.
int cube = num num num;: Calculate the cube of the current even number.
sum += cube;: Add the cube to the sum.
num += 2;: Move to the next even number.
}: Close the while loop.
printf("Sum of cubes of even numbers up to %d: %d\n", limit, sum);: Print the sum of cubes of even numbers.
return 0;: Indicate successful program execution.
}: Close the main function.

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to calculate the sum of cubes of even numbers up to a given limit using a while loop, skipping cubes divisible by 10.
Write a C program to compute the sum of cubes of even numbers up to a specified limit and then subtract the sum of cubes of odd numbers.
Write a C program to calculate the sum of cubes of even numbers up to a given limit using a while loop and then determine the average cube value.
Write a C program to sum the cubes of even numbers up to a given limit using a while loop and output the result in scientific notation.

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