Java Program to Decrement Each Element of Array by a Specified Number

Java Program to Decrement Each Element of Array by a Specified Number

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In the previous article, we have seen Java Program to Decrement Each Element of Array by 1 and Print the Decremented Array

In this article we are going to see how decrement array element by a specified number using Java programming language.

Java Program to Decrement Each Element of Array by a Specified Number and Print the Decremented 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 decrement each element of array by a specified number and print the incremented array.

Method-1: Java Program to Decrement Each Element of Array by 1 and Print the Decremented Array By Static Initialization of Array Elements

Approach:

  • Declare and initialize an array.
  • Iterate over the array.
  • Decrement each element by a specified number.
  • Print the array.

Program:

import java.util.Arrays;
import java.util.Scanner;

public class Main
{
    public static void main(String[] args) 
    {
        int arr[]={10,20,30,40,50};
        int n=5;
        System.out.println("Original array: " + Arrays.toString(arr));
        Decrement(arr,n);
    }

    private static void Decrement(int[] arr, int n) 
    {
        for (int i=0; i<arr.length; i++) 
        {
            arr[i]=arr[i]-n;
        }
        System.out.println("Decremented array: " + Arrays.toString(arr));
    }

}
Output:

Original array: [10, 20, 30, 40, 50]
Decremented array: [5, 15, 25, 35, 45]

Method-2: Java Program to Decrement Each Element of Array by a Specified Number and Print the Decremented Array By Dynamic Initialization of Array Elements

Approach:

  • Take the array size from user.
  • Take input of array elements as user input.
  • Iterate over the array.
  • Decrement each element by a specified number.
  • Print the array.

Program:

import java.util.Arrays;
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];
        // take input from user for array elements
        System.out.print("Enter array elements: ");
        for (int i = 0; i < n; i++) 
        {
            arr[i] = sc.nextInt();
        }
        // take input from user for array size 
        System.out.print("Enter the specified number : "); 
        int num = sc.nextInt();
        System.out.println("Original array: " + Arrays.toString(arr));
        Decrement(arr,num);
    }

    private static void Decrement(int[] arr,int num) 
    {
        for (int i = 0; i < arr.length; i++) 
        {
            arr[i]=arr[i]-num;
        }
        System.out.println("Decremented array: " + Arrays.toString(arr));
    }

}
Output:

Enter the size of array: 5
Enter array elements: 10 20 30 40 50
Enter the specified number : 5
Original array: [10, 20, 30, 40, 50]
Decremented array: [5, 15, 25, 35, 45]

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