Floating point puzzle: 5 * 0.1 == 0.5?

Code:

System.out.println(5 * 0.1 == 0.5); 

Answer: true

• 0.5 can be represented exactly in binary floating-point format (unlike many other decimals like 0.1 or 0.2).
• Therefore, in this specific case, the calculation results in exactly 0.5 and returns true.

Caution:

Never rely on == for floating-point comparisons in production logic (e.g., 0.1 + 0.2 == 0.3 is false). Use a small epsilon value or BigDecimal for monetary calculations.