Round a floating-point number down to the nearest integer

Question

I want to take a floating-point number and round it down to the nearest integer  However  if it s not a whole  I always want to round down the variable  regardless of how close it is to the next integer up  Is there a way to do this

User · Answer

To get floating point result simply use   round x-0 5    It works for negative numbers as well

User · Answer

Simple  print int x    will work as well

User · Answer

a lot of people say to use int x   and this works ok for most cases  but there is a little problem  If OP s result is   x   1 9999999999999999   it will round to  x   2   after the 16th 9 it will round  This is not a big deal if you are sure you will never come across such thing  But it s something to keep in mind

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If you working with numpy  you can use the following solution which also works with negative numbers  it s also working on arrays   import numpy as np def round down num       if num  lt  0          return -np ceil abs num       else          return np int32 num  round down   np vectorize round down      round down  -1 1  -1 5  -1 6  0  1 1  1 5  1 6    gt  array  -2   -2   -2    0    1    1    1      I think it will also work if you just use the math module instead of numpy module

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I used this code where you subtract 0 5 from the number and when you round it  it is the original number rounded down      round a-0 5

User · Answer

I think you need a floor function    math floor x

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It may be very simple  but couldn t you just round it up then minus 1  For example   number 1 5 round number -1  gt  1

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If you don t want to import math  you could use   int round x    Here s a piece of documentation    gt  gt  gt  help round  Help on built-in function round in module   builtin     round          round number   ndigits   - gt  floating point number      Round a number to a given precision in decimal digits  default 0 digits       This always returns a floating point number   Precision may be negative

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Don t know if you solved this  but I just stumble upon this question  If you want to get rid of decimal points  you could use int x  and it will eliminate all decimal digits  Theres no need to use round x

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One of these should work   import math math trunc 1 5   gt  1 math trunc -1 5   gt  -1 math floor 1 5   gt  1 math floor -1 5   gt  -2

User · Answer

Just make round x-0 5  this will always return the next rounded down Integer value of your Float  You can also easily round up by do round x 0 5

User · Answer

x  1   The    operator returns the floor of the division  Since dividing by 1 doesn t change your number  this is equivalent to floor but no import is needed   Notes    This returns a float This rounds towards -8

[python] Round a floating-point number down to the nearest integer?

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