Question

USING JAVA ONLY

Merge two 1D arrays into a single array. take one value from each array at a time.

Sample:

array 1: 1,2,3,4,5

array 2: 2,4

new array: 1,2,2,4,3,4,5

Answer 1

import java.util.Scanner;

public class MergeArrays {

    public static int[] merge(int[] a, int[] b) {
        int[] result = new int[a.length + b.length];
        int maxLength = a.length, index = 0;
        if (b.length > maxLength) maxLength = b.length;
        for (int i = 0; i < maxLength; i++) {
            if (i < a.length) {
                result[index++] = a[i];
            }
            if (i < b.length) {
                result[index++] = b[i];
            }
        }
        return result;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter size of first array: ");
        int n1 = in.nextInt();
        int[] arr1 = new int[n1];
        System.out.print("Enter " + n1 + " numbers: ");
        for (int i = 0; i < n1; ++i) {
            arr1[i] = in.nextInt();
        }
        System.out.print("Enter size of second array: ");
        int n2 = in.nextInt();
        int[] arr2 = new int[n2];
        System.out.print("Enter " + n2 + " numbers: ");
        for (int i = 0; i < n2; ++i) {
            arr2[i] = in.nextInt();
        }

        int[] arr = merge(arr1, arr2);
        System.out.print("new array: ");
        for (int i = 0; i < arr.length; ++i) {
            System.out.print(arr[i] + " ");
        }
        System.out.println();
    }
}