Java Program to Find the Elements from an Array which are Smaller than a Given Number

In the previous article, we have seen Java Program to Find the Elements from an Array which are Greater than a Given Number

In this article we are going to see how to Find the Elements from an Array which are Smaller than a Given Number.

Java Program to Find the Elements from an Array which are Smaller than a Given Number

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 Find the Elements from an Array which are Smaller than a Given Number.

Method-1: Java Program to Find the Elements from an Array which are Smaller than a Given Number By Static Initialization of Array Elements

Approach:

  1. Iterate over the array.
  2. Check if any element is smaller than the given number then print.

Program:

public class Main
{
    public static void main(String[] args) 
    {
        // initialize the array
        int[] arr = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
        int num = 5;

        // call the method
        System.out.print("Elements smaller than " + num + " are: ");
        findGreater(arr, num);
    }

    public static void findGreater(int[] arr, int num) 
    {
        for (int i : arr) 
        {
            if (i < num) 
            {
                System.out.print(i + " ");
            }

        }
    }
}

Output:

Elements smaller than 5 are: 1 2 3 4

Method-2: Java Program to Find the Elements from an Array which are Smaller than a Given Number By Dynamic Initialization of Array Elements

Approach:

  1. Create scanner class object.
  2. Ask use length of the array.
  3. Initialize the array with given size.
  4. Ask the user for array elements.
  5. Iterate over the array.
  6. Check if any element is smaller than the given number then print.

Program:

import java.util.Scanner;

public class Main
{
    public static void main(String[] args) 
    {
        // initialize the array
        // 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 element to be searched
        System.out.print("Enter the number: ");
        int num = sc.nextInt();

        // call the method
        System.out.print("Elements smaller than " + num + " are: ");
        findGreater(arr, num);
    }

    public static void findGreater(int[] arr, int num) 
    {
        // compare each element of array with num
        for (int i : arr) 
        {
            if (i < num) 
            {
                System.out.print(i + " ");
            }

        }
    }
}

Output:

Enter the size of array: 5
Enter array elements: 1 5 3 2 4
Enter the number: 3
Elements smaller than 3 are: 1 2

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