# Precision with Python’s round() Function

In Python, the round() function stands as a crucial tool for precise numerical rounding. This article endeavors to elucidate its usage, applications, and significance through comprehensive examples.

Understanding round() Function

The round() function in Python is employed for rounding floating-point numbers to a specified number of decimal places. Its syntax is as follows:

round(number, ndigits=None)


Here, number represents the floating-point number to be rounded, and ndigits denotes the number of decimal places (default is 0).

Example 1: Basic Rounding

num = 3.14159
rounded_num = round(num)
print("Rounded number:", rounded_num)


Output 1:

Rounded number: 3


Example 2: Rounding to Specific Decimal Places

num = 3.14159
rounded_num = round(num, 2)
print("Rounded number (2 decimal places):", rounded_num)


Output 2:

Rounded number (2 decimal places): 3.14


Example 3: Rounding Negative Numbers

num = -3.14159
rounded_num = round(num)
print("Rounded number:", rounded_num)


Output 3:

Rounded number: -3


Example 4: Rounding with Tie-breaking

num = 2.5
rounded_num = round(num)
print("Rounded number:", rounded_num)


Output 4:

Rounded number: 2


Points to Remember

• The round() function rounds floating-point numbers to the nearest integer by default.
• Specifying ndigits allows rounding to a specific number of decimal places.
• round() employs “round half to even” tie-breaking strategy for consistency.
Author: user