lmarkov

Extract Bit From Number

Nov 29th, 2012
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C# 1.51 KB | None | 0 0
  1. /*
  2.  * Write an expression that extracts from a given integer i the value of a given bit number b. Example: i=5; b=2  value=1.
  3. */
  4.  
  5. using System;
  6.  
  7. class ExtractBitFromNumber
  8. {
  9.     static void Main()
  10.     {
  11.         int numberI, bitNumberB, numberMask, numberToCheck, bitCheckResult;
  12.         string error1 = "Invalid input! Please enter a number between " + int.MinValue + " and " + int.MaxValue + ".\n";
  13.  
  14.         Console.WriteLine("Enter a number:");
  15.         if (int.TryParse(Console.ReadLine(), out numberI) && numberI >= int.MinValue && numberI <= int.MaxValue)
  16.         {
  17.             Console.WriteLine("Enter bit position which you want to check (count from 0): ");
  18.             if (int.TryParse(Console.ReadLine(), out bitNumberB) && bitNumberB >= int.MinValue && bitNumberB <= int.MaxValue)
  19.             {
  20.                 numberMask = 1 << bitNumberB;
  21.                 numberToCheck = numberI & numberMask;
  22.                 if (numberToCheck == 0)
  23.                 {
  24.                     bitCheckResult = 0;
  25.                 }
  26.                 else
  27.                 {
  28.                     bitCheckResult = 1;
  29.                 }
  30.                 Console.WriteLine("Value of bit number {0} for number {1} is: {2}\n", bitNumberB, numberI, bitCheckResult);
  31.                 Main();
  32.             }
  33.             else
  34.             {
  35.                 Console.WriteLine(error1);
  36.                 Main();
  37.             }
  38.         }
  39.         else
  40.         {
  41.             Console.WriteLine(error1);
  42.             Main();
  43.         }
  44.     }
  45. }
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