Programs

Python Program for Floor Function

The math.floor function Python is one of the math functions contained in the math library of Python. The math.floor function in Python returns the smallest integer value less than or identical to the defined expression or value.

Syntax of the Floor Function

The floor Function in the Python math library has the following syntax:

math.FLOOR(Expression)

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Floor Function Number Theory

math.floor(x)

The x’s floor which is the greatest integer but less than or same as x is returned.

Syntax:

import math

math.floor(x)

Parameter:

x-numeric expression.

Returns:

An integer that is largest but not more than x.

The Python’s floor function returns an integer value close to the given numeric value. However, the returned integer value should be  equal to or less than the given numeric value. Let me show you a straightforward example of a floor function that returns the closet value of three numbers given below. 

The floor() method in Python is implemented as follows

# prints the ceil using floor() method

print “math.floor(-23.11) : “, math.floor(-23.11)

print “math.floor(300.16) : “, math.floor(300.16)

print “math.floor(300.72) : “, math.floor(300.72)

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Output 

math.floor(-23.11) : -24.0

math.floor(300.16) : 300.0

math.floor(300.72) : 300.0

Difference between int and floor Function in Python

Python’s floor() function returns a float value. Int() returns an integer (and in some cases, an overflow error). There may be a few explanations why having floor() might be helpful.

  • floor() is the mathematical floor function and int() is equivalent to sgn(x)|x| in math
  • When negative numbers are used the distinction is clear.

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Example:

bring in math

math.floor(-3.5)

-4 

int (-3.5)

-3

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Negative numbers are rounded down to get closer to 0 while truncating them gets them closer to 0.

To look at it another way, the floor() would still be less than or identical to the original. Int() will return a value that is closer to zero or equal.

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