Write a Java test program that reads a String from the user and then prints the

Question

Write a Java test program that reads a String from the user and then prints the following: Only the uppercase letters in the string. Every second letter in the string. The string with all the vowels replaced with an underscore. The number of vowels in the string. The positions of all the vowels in the string. This program should be contained in a single main method. Each of the print requirements above should be implemented in a separate loop. At least two of the loops must use while, the remainder may use for.

Explanation / Answer

Hi, Please find my implementation.

Please let me know in case of any issue.

import java.util.Scanner;

public class StringOperation {

  

   public static void main(String[] args) {

      

       // Scanner Object to read user inout

       Scanner sc =new Scanner(System.in);

      

       // taking user input

       System.out.println("Enter a string: ");

       String input = sc.nextLine();

      

       //1. printing Upper Case letter

       for(int i=0; i<input.length(); i++){

           char c = input.charAt(i); // current letter

          

           if(Character.isLetter(c)){ // if current character is letter

               if(Character.isUpperCase(c))

                   System.out.print(c);

           }

       }

      

       System.out.println();

      

       //2. printing every second letter in the string

       int i=0;

       int count = 0;

       while(i < input.length()){

           char c = input.charAt(i); // current letter

           if(Character.isLetter(c)){ // if current character is letter

               count++; // increase count

               if(count == 2){ // if it is second letter

                   System.out.print(c);

                   count = 0; // set count to zero

               }

           }

           i++;

       }

       System.out.println();

      

       //3.replace vowel with upper case

       String replace = "";

       i = 0;

       while(i < input.length()){

           char c = input.charAt(i); // current letter

           if(Character.isLetter(c)){ // if current character is letter

               c= Character.toLowerCase(c); // converting to lower case

               if(c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u')

                   c = '_';

           }

           replace = replace + c;

           i++;

       }

       System.out.println(replace);

       System.out.println();

      

       // 4. number of vowels in the string

       i = 0;

       int vowelCount = 0;

       while(i < input.length()){

           char c = input.charAt(i); // current letter

           if(Character.isLetter(c)){ // if current character is letter

               c= Character.toLowerCase(c); // converting to lower case

               if(c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u')

                   vowelCount++; // increasing vowel count

           }

           i++;

       }

       System.out.println("Number of vowel: "+vowelCount);

       System.out.println();

      

       //5. position of vowel

       i = 0;

       while(i < input.length()){

           char c = input.charAt(i); // current letter

           if(Character.isLetter(c)){ // if current character is letter

               c= Character.toLowerCase(c); // converting to lower case

               if(c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u')

                   System.out.print(i+" ");

           }

           i++;

       }

       System.out.println();

   }

}

/*

Sample run:

Enter a string:

This is the test program by the way!!!.

T

hsshtspormyhwy

th_s _s th_ t_st pr_gr_m by th_ w_y!!!.

Number of vowel: 8

2 5 10 13 19 22 30 33

*/

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