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An integer array refers to an array in which all elements are of integer type. It is also known as an array of integers.
As per the problem statement we have to create an Integer array and display the array elements where all the array elements are the product of other elements of the array.
In this article, we will see how to replace array elements by the product of other array elements by using Java programming language.
int arr[] = { 2, 3, 1, 4, 6 } At Index-0 value will be = 3 * 1 * 4 * 6 = 72 At Index-1 value will be = 2 * 1 * 4 * 6 = 48 At Index-2 value will be = 2 * 3 * 4 * 6 = 144 At Index-3 value will be = 2 * 3 * 1 * 6 = 36 At Index-4 value will be = 2 * 3 * 1 * 4 = 24 So, the updated array elements are {72, 48, 144, 36, 24}
int arr[] = { 1, 3, 2, 4 } At Index-0 value will be = 3 * 2 * 4 = 24 At Index-1 value will be = 1 * 2 * 4 = 8 At Index-2 value will be = 1 * 3 * 4 = 12 At Index-3 value will be = 1 * 3 * 2 = 6 So, the updated array elements are {24, 8, 12, 6}
Step-1 − Declare and initialize an integer array.
Step 2 - Find the product of all array elements.
Step-3 − Divide the product value with the value of the respective index and replace the result. Continue this step till you reach the last array element.
Step-4 − Print the updated array.
Step-1 − Declare and initialize an integer array.
Step-2 − Find the product of left sub array elements. The elements before the respective element to be replaced.
Step-3 − Find the product of the right subarray elements. The element after the element to be replaced.
Step-4 − Find the sum of the product values of the left subarray and the right subarray, and replace it with the result value.
Step-5 − Continue Step-2, 3 and 4 till you reach the last array element.
Step-6 − Print the updated array.
To get the length of an array (number of elements in that array), there is an inbuilt property of array i.e length.
Below refers to the syntax of it −
array.length
where, ‘array’ refers to the array reference.
To get the String representation of the respective array we can use the toString() method of Arrays class in Java.
Arrays.toString(A)
We have provided the solution in different approaches.
By dividing the respective index elements by the total product value
By finding the product value of the left subarray and the right subarray
Let's look at the program and its output one by one.
In this method we will replace the array elements by dividing the total product value by the corresponding element to be replaced.
import java.util.Arrays; public class Main { public static void main(String args[]) { //Declare and initialize the array elements int arr[] = { 2, 3, 1, 4, 6 }; // Print the array elements System.out.println("Array elements are: "+Arrays.toString(arr)); //Declare an int variable 'product' to hold the product value int product = 1; //iterate the array elements and find the product of all elements for(int i=0;i<arr.length;i++) { product*=arr[i]; } //Divide the total product value with the array element to be replaced for(int i=0;i<arr.length;i++) { arr[i] = product/arr[i]; } //print the new array System.out.println("Updated array: "+Arrays.toString(arr)); } }
Array elements are: [2, 3, 1, 4, 6] Updated array: [72, 48, 144, 36, 24]
In this approach, we will replace the array element finding the sum of product of left subarray elements and product of right sub array elements.
import java.util.Arrays; public class Main{ public static void main(String args[]) { int arr[] = {4,2,3,1}; int size=arr.length; int temp[]= new int[size]; int sum=1; System.out.println("Array elements are: "+Arrays.toString(arr)); for(int index=0; index<arr.length; index++) { int leftProduct=1; int rightProduct=1; int i=0; if(i<index) { for(i=0;i<index;i++) { leftProduct*=arr[i]; } } for(i=index+1;i<arr.length;i++){ rightProduct*=arr[i]; } sum=leftProduct*rightProduct; temp[index]=sum; } arr=temp; System.out.println("Updated array: "+Arrays.toString(arr)); } }
Array elements are: [4, 2, 3, 1] Updated array: [6, 12, 8, 24]
In this article, we explored how to replace array elements with the product of other array elements in Java using different methods.
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