Ruby | Numeric round() function

The round() is an inbuilt method in Ruby returns a number rounded to a number nearest to the given number with a precision of the given number of digits after the decimal point. In case the number of digits is not given, the default value is taken to be zero.

Syntax: num.round(ndigits)

Parameters: The function needs a number and ndigits which specifies the number of digits to be rounded off. If ndigits is not given then, default value is taken to be zero.

Return Value: It returns the rounded value.

Example 1:

# Ruby program for round()
# method in Numeric

# Initialize a number
num1 = -16.7834
num2 = -16.78324
num3 = 16.873

# Prints round
puts num1.round(1)
puts num2.round()
puts num3.round()

Output:

-16.8
-17
17

Example 2:

# Ruby program for round()
# method in Numeric

# Initialize a number
num1 = 12.32
num2 = -1321.998321
num3 = -12.2321

# Prints round
puts num1.round(1)
puts num2.round(2)
puts num3.round(3)

Output:

12.3
-1322.0
-12.232