Rounding Decimals

🔢 Rounding Decimals in Python

Python provides several ways to round numbers to a specific number of decimal places. You can use built-in functions, string formatting, or NumPy for arrays.

 1. Using round() Function

• Syntax: round(number, digits)

• digits is optional; default is 0

2. Using String Formatting

• .2f → 2 decimal places

• .3f → 3 decimal places

 3. Using math.floor() and math.ceil()

• floor() → largest integer ≤ number

• ceil() → smallest integer ≥ number

4. Using NumPy for Arrays

• np.round() → rounds to specified decimals

• np.floor() → element-wise floor

• np.ceil() → element-wise ceiling

✅ 5. Using decimal Module for Precision Control

• Provides precise decimal rounding

• Useful in financial calculations

🎯 Practice Exercises

1. Round 5.6789 to 0, 1, 2, 3 decimal places.

2. Create a NumPy array [2.345, 6.789, 1.234] and round it to 2 decimals.

3. Use the decimal module to round 7.555 to 2 decimal places using ROUND_HALF_UP.