1 Write a function that replace vowels within the string sta

1. Write a function that replace vowels within the string star(*).
For example vowels are \'a\',\'e\',\'i\',\'o\',\'u\' so if my string is \"red is awesome!\" the expected output should be \"s*r* *s *ws*m*\"

2. Write a function that takes an array and reverse the array elements.
For example if array[4] = {2, 5, 1, 6} expected output should be {6, 1, 5, 2}

3. Write a function that swaps the value of two variables WITHOUT the temporary variable.

4. Write a function that takes a large integer and add it\'s digit and returns the sum of digits.
For example int num = 12345 and the sum of the digits in num is 15

Solution

ArrayOperation.java

import java.util.Arrays;

public class ArrayOperation {

  
   public static void main(String[] args) {
       String s = \"red is awesome!\";
       System.out.println(replaceVowel(s));
       int array[] = {2, 5, 1, 6} ;
       reverseArray(array);
       System.out.println(Arrays.toString(array));
       swap(5, 4);
       System.out.println(\"Sum of digits: \"+sumDigits(12345));
   }
   public static int sumDigits(int n) {
         
       int sum = 0;
       do {
       sum += n % 10;
         
       } while ((n = n / 10) != 0);
         
       return sum;
         
       }
   public static void reverseArray(int a[]){
       for(int i = 0; i < a.length / 2; i++)
       {
       int temp = a[i];
       a[i] = a[a.length - i - 1];
       a[a.length - i - 1] = temp;
       }
   }
   public static void swap(int a, int b){
       a = a+b;
       b = a-b;
       a = a-b;
       System.out.println(\"A = \"+a+\" B = \"+b);
   }
   public static String replaceVowel(String s){
       String newStr = \"\";
       for(int i=0; i<s.length(); i++){
           char ch = s.charAt(i);
           if(ch==\'a\' ||ch==\'e\' ||ch==\'i\' ||ch==\'o\' ||ch==\'a\' ){
               newStr = newStr + \"*\";
           }
           else{
               newStr = newStr + ch;
           }
       }
       return newStr;
   }
}

Output:

r*d *s *w*s*m*!
[6, 1, 5, 2]
A = 4 B = 5
Sum of digits: 15