How to effectively fix a comment in code if it is missing or not filled?

If a comment in the code is missing or not filled, an effective way to fix the situation is to add a clear and concise description explaining the purpose and logic of the code.

Tips:

• Describe what the function or block of code does, not how it does it (this is visible from the code).
• Use simple and understandable wording.
• Avoid redundant comments that duplicate the code.
• If necessary, add usage examples or explanations of complex algorithms.

Example:

// Returns the sum of array elements
public int sum(int[] numbers) {
    int total = 0;
    for (int num : numbers) {
        total += num;
    }
    return total;
}

Thus, comments make the code more understandable for other developers and facilitate maintenance.