Merge remote-tracking branch 'upstream/master'

Others/CountChar.java

@@ -14,7 +14,7 @@ public class CountChar {
   	  	Scanner input = new Scanner(System.in);
   	  	System.out.print("Enter your text: ");
       	String str = input.nextLine();
-
+        input.close();
         System.out.println("There are " + CountCharacters(str) + " characters.");
     }
 	
@@ -24,7 +24,7 @@ public class CountChar {
      * @return int: Number of characters in the passed string
      * */
 
-    public static int CountCharacters(String str) {
+    private static int CountCharacters(String str) {
 
     	int count = 0;
 

Others/PowerOfTwoOrNot.java

@@ -0,0 +1,33 @@
+import java.util.Scanner;
+
+/**
+*A utility to check if a given number is power of two or not.
+*For example 8,16 etc.
+*/
+public class PowerOfTwoOrNot {
+	
+	public static void main (String[] args) {
+	
+		Scanner sc = new Scanner(System.in);
+		System.out.println("Enter the number");
+		int num = sc.nextInt();
+		boolean isPowerOfTwo = checkIfPowerOfTwoOrNot(num);
+		if (isPowerOfTwo) {
+			System.out.println("Number is a power of two");
+		} else {
+			System.out.println("Number is not a power of two");
+		}
+	}
+
+
+/**
+* Checks whether given number is power of two or not.
+*
+* @param number
+* @return boolean
+*/
+public static boolean checkIfPowerOfTwoOrNot(int number) {
+		return number != 0 && ((number & (number-1)) == 0);
+	}
+
+}

Others/countwords.java

@@ -18,8 +18,8 @@ import java.util.Scanner;
 	  input.close();
         } 
 
-        public static int wordCount(String s){
-          if(s.isEmpty() || s == null) return -1;
+        private static int wordCount(String s){
+          if(s.isEmpty() || s == null) return 0;
           return s.trim().split("[\\s]+").length;
         }