I want to find the cube root ?

Question

1.00/5 (1 vote)

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If the number (unm1) is the number entered by the user.
I tried I did not find the solution.
I am a novice programmer.
An example of attempts
double f = Math.Sqrt(Math.Sqrt(num1));
thanks!!!!

Posted 28-Nov-14 3:10am

haloolal

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[no name] 28-Nov-14 9:13am

Cube root is defined as x^1/3 so you can use Math.Pow(unm1, 1.0/3.0)

haloolal 28-Nov-14 9:37am

Thank you very much

[no name] 28-Nov-14 11:16am

You're welcome.

2 solutions

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OriginalGriff · Accepted Answer · 2014-11-28T03:22:00

Solution 3

The square root of a square root isn't a cube root:
The Cube of x = y * y * y
or x = y³
But if:
Sqrt(Sqrt(x)) == y
Then
Sqrt(x) = y * y
And
x = (y * y) * (y * y)
or x = y⁴

So as Bruno says:

C#

private double CubeRoot(double x)
    {
    return Math.Pow(x, (1.0 / 3.0));
    }

Posted 28-Nov-14 3:22am

OriginalGriff

Comments

haloolal 28-Nov-14 9:35am

Thank you very much

OriginalGriff 28-Nov-14 9:49am

You're welcome!

[no name] 29-Nov-14 6:02am

My 5 also because you explain OP where/why he is wrong.

One small question: how you managed to show exponent that nice?

OriginalGriff 29-Nov-14 6:19am

"One small question: how you managed to show exponent that nice?"
HTML tag characters don't always work too well in comments, so...

less-than sup greater-than exponent value less-than /sup greater-than

x[sup]4[/sup]

[no name] 29-Nov-14 6:26am

Great, thank you very much! For answers it works perfect :)

let's see now in comment: x⁴

OriginalGriff 29-Nov-14 6:50am

Works fine - and in the email notification.

[no name] 29-Nov-14 10:53am

thank you so much for helping a noob.
Bruno

OriginalGriff 29-Nov-14 11:12am

No problem!

Mike Meinz · Accepted Answer · 2014-11-28T03:17:00

Solution 2

A simple way using the .NET Framework's System.Math.Pow method:

C#

public double CubeRoot(double d)
{
    return (System.Math.Pow(d, (1.0/3.0)));
}

Posted 28-Nov-14 3:17am

Mike Meinz

Updated 28-Nov-14 3:49am

v5

Comments

[no name] 28-Nov-14 9:23am

Ends unfortunately in 1 because 1/3 == 0. Better 1.0/3.0 ;)

haloolal 28-Nov-14 9:31am

hi,

The result is shown a number (1).

TheRealSteveJudge 28-Nov-14 9:33am

void methods do not return anything.

[no name] 28-Nov-14 9:36am

well recognized ;)

haloolal 28-Nov-14 9:36am

Thank you very much