Roots In Python

Question

Hi Guys,I'm Trying To Make A Function That Takes Two Parameters a And b,Then Returns The bth Root Of a,I Made It Like This:
def root(a,b):
.......return a**(1/b)
But When I Input Numbers Like 125 And 3,That Should Return 5,It Returns 4.999999 Instead,Can Anybody Tell Me Why Does This Happen And How Can I Fix This?
Note: I Tried To To Use gmpy2 Module,But When Installing It,IT Gives Me An Error,And I Didn't Find The Wheel Version Of It On Python 3.8

Answer 1

Float numbers sometimes come out slightly off.

Can you try to use the round function on your result?

Answer 2

This is problem of floating operations accuracy.
More even try to do 0.1+0.2 )))))))

So it is a small old trick)) use it.

https://code.sololearn.com/cW24N6z1tJVf/?ref=app

Answer 3

HonFu
This Will Round The Number Even If The Answer Is True

Answer 4

You mean, if the result is already as expected?

Well, there's no problem.

round(5) will still be 5.

So just apply it on all the numbers equally.

Answer 5

Have you tried using round?

Because I fail to see the problem.

When I run this...

print(round(5))
print(round(5.0))

... I get 5 both times.

Answer 6

HonFu
For Example:
root(6.25,2)
answer should be float
but round will return an integer

Answer 7

I searched but only found the same formula that you are using (some were coded slightly different)
I even found the same formula with the example of 125 and 3 and the one who answered said it should be 5. However, I tried it and it gave a fraction.

Answer 8

HonFu
No If The Result Is Float

Answer 9

george
Thanks❤️❤️