30 lines
1.2 KiB
C#
30 lines
1.2 KiB
C#
//-- ex-nullable-bool
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using System;
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class MyTest {
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public static void Main(String[] args) {
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Console.WriteLine("Note that null prints as blank or []\n");
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bool? b1 = null, b2 = false, b3 = true;
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bool? b4 = b1^b2, b5 = b1&b2, b6 = b1|b2; // null false null
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Console.WriteLine("[{0}] [{1}] [{2}]", b4, b5, b6);
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bool? b7 = b1^b3, b8 = b1&b3, b9 = b1|b3; // null null true
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Console.WriteLine("[{0}] [{1}] [{2}]", b7, b8, b9);
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Console.WriteLine(b1 != null ? "null is true" : "null is false"); // null is false
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Console.WriteLine(b1 == null ? "!null is true" : "!null is false"); // !null is false
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Console.WriteLine();
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bool?[] bvals = new bool?[] { null, false, true };
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Console.WriteLine("{0,-6} {1,-6} {2,-6} {3,-6} {4,-6}",
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"x", "y", "x&y", "x|y", "x^y");
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foreach (bool? x in bvals)
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foreach (bool? y in bvals)
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Console.WriteLine("{0,-6} {1,-6} {2,-6} {3,-6} {4,-6}",
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x, y, x&y, x|y, x^y);
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Console.WriteLine();
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Console.WriteLine("{0,-6} {1,-6}", "x", "!x");
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foreach (bool? x in bvals)
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Console.WriteLine("{0,-6} {1,-6}", x, !x);
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}
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}
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