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

## C While Loop: Exercise-8 with Solution

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: **

**C Programming Code Editor:**

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