The round()
function in Python is a built-in function used to round a floating-point number to a specified number of decimal places. It is a commonly used function when you need to limit the precision of a floating-point number, whether for display purposes, to avoid floating-point arithmetic errors, or to adhere to specific formatting requirements. The round()
function is versatile, allowing you to round numbers to the nearest whole number or to a specific number of decimal places.
The round()
function rounds a floating-point number to the nearest multiple of 10^-ndigits
. If ndigits
is not specified, it defaults to 0, meaning the function will round the number to the nearest integer. If ndigits
is negative, the function rounds the number to the nearest multiple of 10, 100, etc.
round()
In this example, the number 4.567
is rounded to the nearest integer, which is 5
.
Here, the number 4.567
is rounded to two decimal places, resulting in 4.57
.
In this example, the negative number -4.567
is rounded to one decimal place, resulting in -4.6
.
Here, the number 456
is rounded to the nearest multiple of 10, resulting in 460
.
When working with currency, you often need to round values to two decimal places to represent cents.
In this function, the price is rounded to two decimal places, making it suitable for display as currency.
In scientific calculations, you may need to limit the precision of a result to avoid displaying too many decimal places.
Here, the area of a circle is calculated and then rounded to four decimal places for precision.
In this example, the average of two numbers is rounded to the nearest whole number.
The round()
function in Python is a straightforward yet powerful tool for rounding floating-point numbers to a specified level of precision. Whether you're working with financial data, scientific measurements, or simply need to control the number of decimal places in your results, round()
offers a simple and effective solution.