Question

Java deleting from an array

// arrayDelete

       //

       // delete the value in the array at position k

       // positions are numbered starting with 0

       // elements k+1 through N-1 are moved 'down' one position

       // to close the space left by deleting element k

       // set element N-1 to -99

       // preconditions: 0 <= k <= N-1

       //

   public static void arrayDelete( double[] arr, int k) {

      

       // To do 5. Complete this method

   }

Answer 1

public class ArrayDelete {
   /*Array is initialized as static so that it can be accessed by both the main method and delete method*/
   static double[] array = new double[] {1.0,1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8,1.9};
   public static void main(String[] args) {
       // TODO Auto-generated method stub
       //Printing the initial Array elements
       System.out.println("Initial array: ");
       for(double i:array){
           System.out.print(i+", ");
       }
       System.out.println();
       //Deleting the element which is in position 2 i.e., 0,1,2
       int k= 2;
       //Callint the araayDelete function to delete the element in positin k
       arrayDelete(array, k);
       //Printing the array after removing the elements
       System.out.println("Array After deleting an element: ");
       for(int i=0; i<array.length-1; i++){
           System.out.print(array[i]+", ");
       }
   }

   public static void arrayDelete(double[] array, int k) {
       // TODO Auto-generated method stub
       /* The following loop also works fine just in case if predefined function is not supposed to be used*/
       /*for(int i=0; i<array.length; i++){
           if (k==i){
               for(int j= i+1; j<array.length; j++){
                   array[i]= array[j];
                   i++;
               }
           }
       }*/
       System.arraycopy(array,k+1,array,k,array.length-1-k);
       //N-1 element is initialized to -99 as per the question
       array[array.length-1]=-99;
   }
}

Output: