Rounding is a pretty important skill in Python. In this article, I will show you how to round a number to the nearest 100 in Python. I would use ways like customizing a function using Python’s built-in functions and using two functions, round up and round down, in the math module.
Round a number to the nearest 100 in Python
Customize a function that returns the nearest 100 divisible values
I will customize a divisible function by the nearest 100 using the round() function.
Syntax:
round(number[, ndigits])
Parameters:
- number: Number you want to round.
- ndigits: The number of digits you want after the decimal point.
Return value from the round() function:
- If there are no ndigits, the function returns the nearest integer.
- If two arguments are provided, the function returns a number with ndigits decimal places after the decimal point.
Example:
# Use the round() function to round
def myRound(x):
return round(x / 100) * 100
print("The nearest rounded number is divisible by 100:", myRound(255))
print("The nearest rounded number is divisible by 100:", myRound(311))
print("The nearest rounded number is divisible by 100:", myRound(51))Output:
The nearest rounded number is divisible by 100: 200
The nearest rounded number is divisible by 100: 300
The nearest rounded number is divisible by 100: 100In the above example, I instantiate a function that I named ‘myRound’ that returns the nearest divisible by 100 as follows: I use integer division (the / operator) as the round() parameter, and round() I don’t take any extra digits after the decimal point, so I always get an integer as a result. Multiply that result by 100 to get the nearest number that is divisible by 100.
The second way to use the round() function to round a number to the nearest 100 is setting the ndigits parameter to -2, which has the effect of rounding to the nearest multiple of 100.
Example:
def myRound(value):
return round(value, -2)
print("The nearest rounded number is divisible by 100:", myRound(243))
print("The nearest rounded number is divisible by 100:", myRound(311))
print("The nearest rounded number is divisible by 100:", myRound(134))Output:
The nearest rounded number is divisible by 100: 200
The nearest rounded number is divisible by 100: 300
The nearest rounded number is divisible by 100: 100Use the math.ceil() and math.floor() functions
Syntax:
math.ceil( x )
Parameters:
- x: A numeric expression.
The ceil() function returns the smallest integer that is not less than x.
Example:
- Import math module to call ceil() function.
- The ceil() function rounds the value from the function’s integer division. The result returned is an integer not less than the value of the division.
- Multiply that result by 100 to get the nearest number that is divisible by 100.
import math
# Use the math.ceil() to round up nearest 100
def myRound(number, n = 100):
return math.ceil(number / 100) * 100
print("Number rounded up to the nearest divisible by 100:", myRound(243))
print("Number rounded up to the nearest divisible by 100:", myRound(311))
print("Number rounded up to the nearest divisible by 100:", myRound(134))Output:
Number rounded up to the nearest divisible by 100: 300
Number rounded up to the nearest divisible by 100: 400
Number rounded up to the nearest divisible by 100: 200To round down some of the best way using the math.floor() function.
Syntax:
math.floor(x)
Parameters:
- x: The number you need to round down.
The math.floor() function will round down a number to the nearest integer.
Example:
import math
# Use the math.ceil() to round down nearest 100
def myRound(number, n = 100):
return math.floor(number / 100) * 100
print('Number rounded up to the nearest divisible by 100:', myRound(243))
print('Number rounded up to the nearest divisible by 100:', myRound(311))
print('Number rounded up to the nearest divisible by 100:', myRound(134))Output:
Number rounded down to the nearest divisible by 100: 200
Number rounded down to the nearest divisible by 100: 300
Number rounded đown to the nearest divisible by 100: 100Summary
So the article is over. I hope you understand how to round a number to the nearest 100 in Python. You can use the round() function and set the 2nd parameter to – 2 for short. Thank you for taking the time to read this article.
Maybe you are interested:
- Round a float to the nearest 0.5 in Python
- Round a number to the nearest 1000 in Python
- Round a number to the nearest 5 in Python
My name is Jason Wilson, you can call me Jason. My major is information technology, and I am proficient in C++, Python, and Java. I hope my writings are useful to you while you study programming languages.
Name of the university: HHAU
Major: IT
Programming Languages: C++, Python, Java
