Added Binary to Decimal conversion.

Binary to Decimal.java

@@ -0,0 +1,19 @@
+#import java.util.*;
+class Binary_Decimal
+{
+  public static void main(String args[])
+  {
+    Scanner sc=new Scanner(System.in);
+    int n,k,d,s=0,c=0;
+    n=sc.nextInt();
+    k=n;
+    while(k!=0)
+    {
+      d=k%10;
+      s+=d*(int)Math.pow(2,c++);
+      k/=10;
+    }
+    System.out.println("Binary number:"+n);
+    System.out.println("Decimal equivalent:"+s);
+  }
+}