Merge pull request #380 from petersonddb/dec2bin-bitwise

Add a bitwise conversion for DecimalToBinary. 

@petersonddb Thanks for the commit

Conversions/DecimalToBinary.java

@@ -6,27 +6,52 @@ import java.util.Scanner;
  * @author Unknown
  *
  */
-class DecimalToBinary
+class DecimalToBinary {
-{
+
     /**
      * Main Method
      * 
      * @param args Command Line Arguments
      */
-  public static void main(String args[])
+    public static void main(String args[]) {
-  {
+        conventionalConversion();
-    Scanner sc=new Scanner(System.in);
+        bitwiseConversion();
-    int n,k,s=0,c=0,d;
-    System.out.print("Decimal number: ");
-    n=sc.nextInt();
-    k=n;
-    while(k!=0)
-    {
-      d=k%2;
-      s=s+d*(int)Math.pow(10,c++);
-      k/=2;
-    }//converting decimal to binary
-    System.out.println("Binary equivalent:"+s);
-    sc.close();
     }
+
+    /**
+     * This method converts a decimal number 
+     * to a binary number using a conventional
+     * algorithm.
+     */
+    public static void conventionalConversion() {
+        int n, b = 0, c = 0, d;
+        Scanner input = new Scanner(System.in);
+        System.out.printf("Conventional conversion.\n\tEnter the decimal number: ");
+        n = input.nextInt();
+        while (n != 0) {
+            d = n % 2;
+            b = b + d * (int) Math.pow(10, c++);
+            n /= 2;
+        } //converting decimal to binary
+        System.out.println("\tBinary number: " + b);
+    }
+
+    /**
+     * This method converts a decimal number 
+     * to a binary number using a bitwise
+     * algorithm
+     */
+    public static void bitwiseConversion() {
+        int n, b = 0, c = 0, d;
+        Scanner input = new Scanner(System.in);
+        System.out.printf("Bitwise conversion.\n\tEnter the decimal number: ");
+        n = input.nextInt();
+        while (n != 0) {
+            d = (n & 1);
+            b += d * (int) Math.pow(10, c++);
+            n >>= 1;
+        }
+        System.out.println("\tBinary number: " + b);
+    }
+
 }