2022-04-22 08:11:18 +00:00
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using Microsoft.VisualStudio.TestTools.UnitTesting;
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using X10D.Linq;
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namespace X10D.Tests.Linq;
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[TestClass]
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public class Int32Tests
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{
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[TestMethod]
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public void ProductShouldBeCorrect()
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{
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Assert.AreEqual(0, Enumerable.Range(0, 10).Product());
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Assert.AreEqual(1, Enumerable.Range(1, 1).Product());
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Assert.AreEqual(2, Enumerable.Range(1, 2).Product());
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Assert.AreEqual(6, Enumerable.Range(1, 3).Product());
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Assert.AreEqual(24, Enumerable.Range(1, 4).Product());
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Assert.AreEqual(120, Enumerable.Range(1, 5).Product());
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Assert.AreEqual(720, Enumerable.Range(1, 6).Product());
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Assert.AreEqual(5040, Enumerable.Range(1, 7).Product());
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Assert.AreEqual(40320, Enumerable.Range(1, 8).Product());
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Assert.AreEqual(362880, Enumerable.Range(1, 9).Product());
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Assert.AreEqual(3628800, Enumerable.Range(1, 10).Product());
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}
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[TestMethod]
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public void ProductOfDoublesShouldBeCorrect()
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{
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int Double(int i) => i * 2;
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Assert.AreEqual(0, Enumerable.Range(0, 10).Product(Double));
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Assert.AreEqual(2, Enumerable.Range(1, 1).Product(Double));
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Assert.AreEqual(8, Enumerable.Range(1, 2).Product(Double));
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Assert.AreEqual(48, Enumerable.Range(1, 3).Product(Double));
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Assert.AreEqual(384, Enumerable.Range(1, 4).Product(Double));
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Assert.AreEqual(3840, Enumerable.Range(1, 5).Product(Double));
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Assert.AreEqual(46080, Enumerable.Range(1, 6).Product(Double));
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Assert.AreEqual(645120, Enumerable.Range(1, 7).Product(Double));
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Assert.AreEqual(10321920, Enumerable.Range(1, 8).Product(Double));
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Assert.AreEqual(185794560, Enumerable.Range(1, 9).Product(Double));
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2022-04-22 08:12:35 +00:00
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// Π_(i=1)^n (2i) will overflow at i=10 for int
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2022-04-22 08:11:18 +00:00
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}
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}
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