In the previous article, we have seen Java Program to Print nth Element of the Array
In this article we are going to see how we can multiply an element to every other elements of the array except itself by using Java Language.
Java Program to Multiply an Element to Every Element of the Array
Array is a data structure which stores a fixed size sequential collection of values of single type. Where with every array elements/values memory location is associated. Each array elements have it’s own index where array index starts from 0.
In Array set of variables referenced by a single variable name and it’s array index position. It is also called as a container object which contains elements of similar type.
Declaration of an array:
dataType[] arrayName; (or) //Declaring an array dataType []arrayName; (or) dataType arr[];
Instantiation of an Array:
arrayName = new datatype[size]; //Allocating memory to array
Combining both Statements in One:
dataType[] arrayName = new dataType[size] //Declaring and Instantiating array
Initialization of an Array:
arrayName[index-0]= arrayElement1 //Initializing the array ... arrayName[index-s]= arrayElementS
Combining all Statements in One:
dataType arrayName[ ]={e1,e2,e3}; //declaration, instantiation and initialization
Let’s see different ways to multiply an element to every other elements of the array except itself.
Method-1: Java Program to Multiply an Element to Every Element of the Array By Static Initialization of Array Elements
Approach:
- Declare and initialize an array.
- Enter the index of array element to find that specific element.
- This array element will be multiplied with other array elements.
- Iterate each element of the array and multiply that specific array element with others elements except self.
Program:
public class Main
{
public static void main(String[] args)
{
//array initialized
int arr[] = {10,20,30,40,50,60};
// creating new array with size of actual array
int result[]= new int[arr.length];
System.out.println("Array length is : "+arr.length);
//declaring array index of the specified number
//which will be multiplied withother array elelments
int num = 2;
//if the entered index(means specified number) exists in the array
//then only the specified array element can be multiplied with other array elements
if(num<arr.length)
{
//iterating the array
for(int i=0;i<arr.length;i++)
{
// checking condition
// if array element is not the specified number
// then it will enter into the if block
// and the number will be multiplied with other elements except itself
if(arr[i]!=arr[num])
{
// multiplying the specified array element with other array elements
result[i] = arr[i]*arr[num];
}
}
}
//assigning the specified number to the same index of result array
//as the specified number will be same
result[num]=arr[num];
//printing the result array after multiplication
System.out.println("New array after multiplication of array with a specific array element : ");
for(int i=0;i<result.length;i++)
{
System.out.print(result[i]+" ");
}
}
}
Output: Array length is : 6 New array after multiplication of array with a specific array element : 300 600 30 1200 1500 1800
Method-2: Java Program to Multiply an Element to Every Element of the Array By Dynamic Initialization of Array Elements
Approach:
- Take the array size as user input.
- Then take array elements as user input.
- Enter the index of array element to find that specific element.
- This array element will be multiplied with other array elements.
- Iterate each element of the array and multiply that specific array element with others elements except self.
Program:
import java.util.Scanner;
public class Main
{
public static void main(String[] args)
{
// create scanner class object
Scanner sc = new Scanner(System.in);
// take input from user for array size
System.out.print("Enter the size of array: ");
int n = sc.nextInt();
// initialize array with size n
int arr[] = new int[n];
// creating new array with size of actual array
int result[]= new int[arr.length];
// take input from user for array elements
System.out.print("Enter array elements: ");
for (int i = 0; i < n; i++)
{
arr[i] = sc.nextInt();
}
System.out.println("Array length is : "+arr.length);
//talking input of array index
System.out.print("Enter index of the element to be multiplied : ");
int num = sc.nextInt();
//if the entered index(means specified number) exists in the array
//then only the specified array element can be multiplied with other array elements
if(num<arr.length)
{
//iterating the array
for(int i=0;i<arr.length;i++)
{
// checking condition
// if array element is not the specified number
// then it will enter into the if block
// and the number will be multiplied with other elements except itself
if(arr[i]!=arr[num])
{
// multiplying the speciifed array element with other array elements
result[i] = arr[i]*arr[num];
}
}
}
//assigning the specified number to the same index of result array
//as the specified number will be same
result[num]=arr[num];
//printing the result array after multiplication
System.out.println("New array after multiplication of array with a specific array element : ");
for(int i=0;i<result.length;i++)
{
System.out.print(result[i]+" ");
}
}
}
Output: 'Enter the size of array: 5 Enter array elements: 1 2 3 4 5 Array length is : 5 Enter index of the element to be multiplied : 2 New array after multiplication of array with a specific array element : 3 6 3 12 15
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