mcs/tests/gtest-130.cs

   1 //-- ex-nullable-bool
   2
   3 using System;
   4
   5 class MyTest {
   6   public static void Main(String[] args) {
   7     Console.WriteLine("Note that null prints as blank or []\n");
   8     bool? b1 = null, b2 = false, b3 = true;
   9     bool? b4 = b1^b2, b5 = b1&b2, b6 = b1|b2;                     // null false null
  10     Console.WriteLine("[{0}] [{1}] [{2}]", b4, b5, b6);
  11     bool? b7 = b1^b3, b8 = b1&b3, b9 = b1|b3;                     // null null true
  12     Console.WriteLine("[{0}] [{1}] [{2}]", b7, b8, b9);
  13     Console.WriteLine(b1 != null ? "null is true" : "null is false");     // null is false
  14     Console.WriteLine(b1 == null ? "!null is true" : "!null is false");  // !null is false
  15
  16     Console.WriteLine();
  17     bool?[] bvals = new bool?[] { null, false, true };
  18     Console.WriteLine("{0,-6} {1,-6} {2,-6} {3,-6} {4,-6}",
  19                       "x", "y", "x&y", "x|y", "x^y");
  20     foreach (bool? x in bvals)
  21       foreach (bool? y in bvals)
  22         Console.WriteLine("{0,-6} {1,-6} {2,-6} {3,-6} {4,-6}",
  23                           x, y, x&y, x|y, x^y);
  24     Console.WriteLine();
  25     Console.WriteLine("{0,-6} {1,-6}", "x", "!x");
  26     foreach (bool? x in bvals)
  27       Console.WriteLine("{0,-6} {1,-6}", x, !x);
  28   }
  29 }