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Converting floating point numbers to integers in Python is relatively easy thanks to built-in functions and libraries. When converting floating point numbers to integers, there are two possibilities. Although it is easy to write your own function to accomplish this task, in this article we will only discuss how to use built-in functions and libraries.

Suppose we have a number, for example 1.52. If we wish to convert that number to an integer, we can use 2or 1. The former is the highest value and the latter is the lowest value. Since there are multiple functions to accomplish this task, they all perform the above task in different ways and return different values. So, choose the appropriate function based on your use case.

int()Convert floating point numbers to integers in Python using the

number = 25.49
print(int(number))

Output:

25

int()The function accepts an argument representing a number and converts it to an integer. This argument can be a string, a floating point value, or an integer itself. The function considers the integer value or the part before the decimal point in the number and returns it.

However, the behavior is slightly different when integer.9999999999999999passed as an argument in the form of an integer int(). If there are more than sixteen 9digits after the decimal point, the function will return in case of a positive number 整数+1and in case of a negative number 整数-1as the answer.

Refer to the following code snippet to understand the concept better.

print(int(1.5))
print(int(1.51))
print(int(1.49))
print(int(-1.5))
print(int(-1.51))
print(int(-1.49))
print(int(1.9999999999999999))
print(int(-1.9999999999999999))

Output:

0
1
1
1
1
-1
-1
-1
2
-2

mathConvert floating point numbers to integers using the Python module

We can use the built-in Python library mathto accomplish the same task. This library has various mathematical functions required for mathematical calculations.

We will discuss only maththree math functions in the library.

As the name suggests, trunc()the function truncates or cuts off the decimal part of the number passed as an argument and only considers the integer part. It int()behaves exactly like the built-in function, except for the exceptions we talked about above.

import math

print(math.trunc(0))
print(math.trunc(1))
print(math.trunc(1.5))
print(math.trunc(1.51))
print(math.trunc(1.49))
print(math.trunc(-1.5))
print(math.trunc(-1.51))
print(math.trunc(-1.49))
print(math.trunc(1.9999999999999999))
print(math.trunc(-1.9999999999999999))

Output:

0
1
1
1
1
-1
-1
-1
2
-2

See the official documentation to learn more about this function, here

Next, we have ceil()the function. This function returns the ceiling value of a number or the smallest integer greater than or equal to the number passed as an argument.

import math

print(math.ceil(0))
print(math.ceil(1))
print(math.ceil(1.5))
print(math.ceil(1.51))
print(math.ceil(1.49))
print(math.ceil(-1.5))
print(math.ceil(-1.51))
print(math.ceil(-1.49))
print(math.ceil(1.9999999999999999))
print(math.ceil(-1.9999999999999999))

Output:

0
1
2
2
2
-1
-1
-1
2
-2

See the official documentation to learn more about this function, here

Finally, we have floor()the function. This function returns the floor value of a number or the largest integer that is less than or equal to the number passed as an argument.

import math

print(math.floor(0))
print(math.floor(1))
print(math.floor(1.5))
print(math.floor(1.51))
print(math.floor(1.49))
print(math.floor(-1.5))
print(math.floor(-1.51))
print(math.floor(-1.49))
print(math.floor(1.9999999999999999))
print(math.floor(-1.9999999999999999))

Output:

0
1
1
1
1
-2
-2
-2
2
-2

See the official documentation to learn more about this function, here