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