A code smell is a symptom in code that indicates potential design flaws or bad practices.

Explanation:

• Code smells don’t break the system but reduce maintainability.
• Examples:
  • Duplicate code – Same logic repeated in multiple places.
  • Long methods – Methods that do too much and become unreadable.
  • Magic numbers – Hardcoded values with no explanation.

Example (Bad Code – Code Smell)

java int calc(int a, int b) {
    return a * b * 3.14;  // Magic number (3.14 should be a constant)
}

Fix (Refactored Code):

javafinal double PI = 3.14;
int calc(int a, int b) {
    return a * b * PI;
}

• The PI value is now readable and reusable.