1. Write a program that reads a string and counts the number of words in it. Wor

Question

1. Write a program that reads a string and counts the number of words in it.
Words are dened as substrings separated by spaces. For instance, whenthe user enters “Call me Ishmael” the program should output 3.

2. A palindrome is a word, phrase, number, or other sequence of characterswhich reads the same backward or forward. Write a program that reads astring and outputs it in reverse. For instance if the user enters “abcdef”,your program should output “fedcba”. Now, add the code to print to thescreen whether the original string is a palindrome.

Explanation / Answer

1)

/**The java program that promtps user enter the stirng
* from user and prints the number of words in the string*/
//WordCount.java
import java.util.Scanner;
public class WordCount
{
   public static void main(String[] args)
   {
       //Create a Scanner class object
       Scanner scanner=new Scanner(System.in);
      
       //delcare string variable
       String sentence;
      
       System.out.println("Enter a string");
       //read string
       sentence=scanner.nextLine();
      
       //calling countWords
       int count=countWords(sentence);
      
       //print sentence
       System.out.println("Input String : "+sentence);
       //print count
       System.out.println("Number of words : "+count);
      
   }

   /**Method countWords that takes string as input
   * and returns the number of words in the string sentence*/
   private static int countWords(String sentence)
   {
       int count=1;
       //run for loop
       for (int i = 0; i < sentence.length(); i++)
       {
           //Check if character at i is space
           if(sentence.charAt(i)==' ')
               //increment the count by one
               count++;
       }
       //return count vaoue
       return count;
   }
}

Sample output:

Enter a string
Call me Ishmael
Input String : Call me Ishmael
Number of words : 3

------------------------------------------------------------------------------------------------------------------------

2)

/**The java program Palindrome that prompts user to enter
* string value and calls reverse method.
* Then checks if the string and its reverse are equal
* then print palindrome otherwise print not palindrome*/
//Palindrome.java
import java.util.Scanner;
public class Palindrome
{
   public static void main(String[] args)
   {
       //Create a Scanner class object
       Scanner scanner=new Scanner(System.in);
       //delcare string variable
       String str="";

       System.out.println("Enter a string ");
       //read string from user
       str=scanner.nextLine();

       //Call reverse method with string value, str
       String rev=reverse(str);

       //Check if str is equal to rev string
       if(str.equals(rev))
           //print palindrome
           System.out.println("Palindrome");
       else
           //otherwise print not palindrome
           System.out.println("Not palindrome");
   }

   /**The method reverse takes string, str that reverse the
   * string and returns reverse of a string*/
   private static String reverse(String str)
   {
       String reverse="";      
       for (int i = str.length()-1; i>=0 ; i--)       
           reverse+=str.charAt(i);
       //returns reverse of string
       return reverse;
   }
}//end of class

sample output:

Enter a string
madam
Palindrome

output2:

Enter a string
jasmine
Not palindrome

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