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Replace heuristic sqrt with integer algorithm

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Marek Lemańczyk committed 2025-10-29 01:02:31 +01:00
1 parent b54f4b6bd6
commit eeeff42be6
3 files changed
+95 -26
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PerfectNumbers.Core.Tests/HeuristicCombinedPrimeTesterTests.cs
+47
View File
@@ -1,4 +1,5 @@
using System;
using System.Numerics;
using System.Collections.Generic;
using PerfectNumbers.Core;
using FluentAssertions;
@@ -193,4 +194,50 @@ public class HeuristicCombinedPrimeTesterTests
(groupBValue % 10U).Should().NotBe(3U);
}
}
[Theory]
[Trait("Category", "Fast")]
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[InlineData(18_446_744_073_709_551_614UL)]
[InlineData(18_446_744_073_709_551_613UL)]
public void ComputeHeuristicSqrt_returns_floor_square_root(ulong value)
{
ulong sqrt = HeuristicCombinedPrimeTester.ComputeHeuristicSqrt(value);
bool squareBelowOrEqual = (UInt128)sqrt * sqrt <= (UInt128)value;
bool nextSquareAbove = (UInt128)(sqrt + 1UL) * (UInt128)(sqrt + 1UL) > (UInt128)value;
squareBelowOrEqual.Should().BeTrue();
nextSquareAbove.Should().BeTrue();
}
}