Question

Valentine’s Day Question(JAVA)

Suppose you had a list with 30 valentines and you stored their names in an array (you hopeless romantic). Then if you had 5 people ask to be your valentine, you would need to make a new array of size 35 (30 + 5) and copy over the original valentines before being able to add the new valentines to the array. This question uses the same logic.

Write a program that has a method called doubleSize. The method takes in an array of integers called values. The method will create a new array of integers that will be double (two times) the size of the passed in array. It will copy all the integers contained in values to the new array and return the new array.

In the main method:

• Use a Scanner object to read in one int (n) that represents the size of an array of integers. Create an array of integers that uses this first number as the size.
• You will then read in (n) ints all on the same line and store them in the array.
• Call the method doubleSize and pass in the array of integers. This will return a new array with copied values.
• Print the elements of the new array in the main method.

The method header looks as follows:

public static int [] doubleSize (int[] values)

You must use a method.

Input

In integer (n), followed by a list of n integers.

Example Input: 5 12 34 12 9 -7

Output

A single double representing the smallest number.

Example Output: 12 34 12 9 -7 0 0 0 0 0

Answer 1

import java.util.Scanner;

public class ValentinesDay {

   public static int[] doubleSize(int[] values) {
       // reading the size of the values array
       int initialsize = values.length;
       // multiplying the values array size with 2 so that we get the
       // double size for creation of new array
       int upgradedsize = initialsize * 2;
       // declaring the new array by name "resizedvalues" with length as
       // upgradedsize
       int[] resizedvalues = new int[upgradedsize];
       // running the for loop to copy the "values" array elements and to
       // assign value 0 for the resized locations in the array
       for (int inc = 0; inc < upgradedsize; inc++) {
           if (inc < initialsize) {
               // copying the values array to resizedvalues array
               resizedvalues[inc] = values[inc];
           } else {
               // assigning value zero to the remaining locations
               resizedvalues[inc] = 0;
           }
       }

       return resizedvalues;

   }

   public static void main(String args[]) {
       // initializing the scanner to read the values from the console.
       Scanner in = new Scanner(System.in);
       System.out.println("input the intial size of the array : ");
       // reading the size from the console and assigning it to a size
       // variable.
       int size = Integer.parseInt(in.next());
       // declaring the int array by name "values" with the size given as input
       int[] values = new int[size];
       System.out.println("input the integers one by one ");
       // for loop to read the values into the int array "values" one by one.
       for (int counter = 0; counter < size; counter++) {
           values[counter] = in.nextInt();
       }
       // calling the doubleSize method by passing the values array as
       // parameter
       // and assigning the returned array from the doublesize method to
       // upgradedarray
       int[] upgradedarray = doubleSize(values);
       // running a for loop to print the values in the resized array by name
       // "upgradedarray"
       for (int inc = 0; inc < upgradedarray.length; inc++) {
           // using if condition for spacing the output
           if (inc != 0)
               System.out.print(" ");
           else
               System.out.println("The resized array is :");
           System.out.print(upgradedarray[inc]);
       }
       // closing the scanner
       in.close();
   }

}