O'Halloran numbers: Difference between revisions
Add C# implementation
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(Add C# implementation) |
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[8, 12, 20, 36, 44, 60, 84, 116, 140, 156, 204, 260, 380, 420, 660, 924]
</pre>
=={{header|C#}}==
<syntaxhighlight lang="C#">
using System;
using System.Linq;
class OHalloranNumbers
{
static void Main(string[] args)
{
int maximumArea = 1000;
int halfMaximumArea = maximumArea / 2;
bool[] ohalloranNumbers = Enumerable.Repeat(true, halfMaximumArea).ToArray();
for (int length = 1; length < maximumArea; length++)
{
for (int width = 1; width < halfMaximumArea; width++)
{
for (int height = 1; height < halfMaximumArea; height++)
{
int halfArea = length * width + length * height + width * height;
if (halfArea < halfMaximumArea)
{
ohalloranNumbers[halfArea] = false;
}
}
}
}
Console.WriteLine("Values larger than 6 and less than 1,000 which cannot be the surface area of a cuboid:");
for (int i = 3; i < halfMaximumArea; i++)
{
if (ohalloranNumbers[i])
{
Console.Write(i * 2 + " ");
}
}
Console.WriteLine();
}
}
</syntaxhighlight>
{{out}}
<pre>
Values larger than 6 and less than 1,000 which cannot be the surface area of a cuboid:
8 12 20 36 44 60 84 116 140 156 204 260 380 420 660 924
</pre>
=={{header|C++}}==
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