Problem 133. Volume of this donut

Created by AMITAVA BISWAS

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Given hole diameter a, and outermost diameter b, determine the volume y of the resulting donut.

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Solution Stats

Last solution submitted on Oct 05, 2019

Last 200 Solutions

Problem Comments

9 Comments

9 Comments

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the cyclist on 28 Jan 2012

I think the input are the radii, not the diameters, but I'm too lazy to check for sure.

Daniel on 28 Jan 2012

not really, the test sequence is simply wrong.

... on 25 Feb 2012

I spend 20mn to understand that the data are inverted, thanks :|

... on 25 Feb 2012

and also five minus it is not diameter but radii, a is outer radii and b the radii of the hole

Bart Vandewoestyne on 20 Apr 2012

It should be specified more clear what the input parameters mean exactly geometrically.

Peter Wittenberg on 3 Jun 2012

What a waste! Calling a radius a diameter. I got numbers that were off by a factor of 8, which turned out to be that I had used the information that a and b were diameters, whereas Bistwas used them as radii. Please correct the problem definition.

CC on 3 Jun 2012

If a is the hole diameter and b is the outermost diameter, how can a>b in the test cases?

Matthew Eicholtz on 21 Jul 2012

Problem is written incorrectly.

bainhome on 23 Aug 2014

test suite'answer is wrong if a and b is diameter instead of radius.

Solution Comments

Solution 1265983

1 Comment

1 Comment

Nishant Kumar on 11 Sep 2017

Volume should be y = pi^2/32*(a+b)i*(b-a)^2

Solution 840072

1 Comment

1 Comment

eggart on 29 Feb 2016

I wonder whether it it adequate to test correctness of double answers by equality. To do so discounts rounding errors and the fact that IEEE 754 does not guarantee the laws of arithmetic.

Solution 812950

1 Comment

1 Comment

William on 24 Jan 2016

So, when you say "diameter" you mean "radius"? And when you say "outer" you mean "inner"?

Solution 95031

1 Comment

1 Comment

CC on 3 Jun 2012

If a is the hole diameter and b is the outermost diameter, how can a>b in the test cases?

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Problem 133. Volume of this donut

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Last 200 Solutions

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Problem Recent Solvers136

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Problem 133. Volume of this donut

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Last 200 Solutions

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