Question

You are expected to write a program from scratch. In the program, an array will be initialized with 23 random integers between 1000 and 1999 (inclusive). The output of the program is 4 lines on the screen, specifically,

• All elements in the array (line 1)
• All elements in reverse order (line 2)
• Every element that is less than 1500 and also at an odd index (line 3)
• Every odd element that is larger than 1500 (line 4)

Note that you have to use the method Math.random() we covered previously to generate the random numbers. Other ways like using Random class we haven't covered or just reading in 23 numbers from keyboards are NOT accepted.

Please explain/comment on what each line means and what the process is. Thank you, I appreciate it.

Answer 1

Please find the code below::

RandomArray.java

package classes10;

public class RandomArray {
   public static void main(String[] args) {
       //declare array of size 23
       int myArray[] = new int[23];

       //populate array with random data
       for(int i=0;i<23;i++){
           myArray[i] = (int) (Math.random()*1000+999);
       }

       //printing array in right order
       for(int i=0;i<23;i++){
           System.out.print(myArray[i]+" ");
       }

       System.out.println();
       //printing array in reverse order
       for(int i=22;i>=0;i--){
           System.out.print(myArray[i]+" ");
       }

       System.out.println();
       //printing odd index number less than 1500
       for(int i=0;i<23;i++){
           if(i%2==0 && myArray[i]<1500)
               System.out.print(myArray[i]+" ");
       }

       System.out.println();
       //printing odd index number less than 1500
       for(int i=0;i<23;i++){
           if(myArray[i]>1500 && myArray[i]%2!=0)
               System.out.print(myArray[i]+" ");
       }

   }
}

output: