Programming Example

Define a class to accept values into an array of double data type of size 20. Accept a double value from user and search in the array using linear search method. If value is found display message "Found" with its position where it is present in the array. Otherwise display message "not found".

👁 94 Views

💻 Practical Program

📘 Step by Step Learning

Study this program carefully to understand the logic, output, and explanation in a structured way.

Information & Algorithm

Given Input:

Enter array elements:
1.5 2.3 3.9 4.1 5.6 6.7 7.8 8.0 9.2 10.5 11.3 12.6 13.7 14.8 15.9 16.4 17.5 18.3 19.0 20.1
Enter the number to search: 15.9

Expected Output:

15.9 found at index 14

Program Code

import java.util.Scanner;

public class RansariLinearSearch {

    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);  // Create Scanner object for input
        
        double arr[] = new double[20];  // Declare an array of double data type with size 20
        int l = arr.length;  // Get the length of the array (which is 20)
        int i = 0;
        
        // Accept values for the array from the user
        System.out.println("Enter array elements: ");
        for (i = 0; i < l; i++) {
            arr[i] = in.nextDouble();  // Accept each double value from the user and store it in the array
        }
        
        // Ask user for the number to search in the array
        System.out.print("Enter the number to search: ");
        double n = in.nextDouble();  // Accept the number to search for
        
        // Linear search algorithm
        for (i = 0; i < l; i++) {
            if (arr[i] == n) {  // If the current element is equal to the number being searched
                break;  // Exit the loop when the value is found
            }
        }
        
        // Check if the number was found or not
        if (i == l) {
            System.out.println("Not found");  // If the loop goes through all elements and doesn't find the number
        } else {
            System.out.println(n + " found at index " + i);  // If the number was found, display the index
        }

        in.close();  // Close the Scanner object
    }
}

Output

15.9 found at index 14

If the search value is not found in the array:

Not found


Output:
mathematica
Copy
Edit

Explanation

Array Creation: A double[] array of size 20 is created to store the user's input values.
User Input: The program prompts the user to enter 20 double values to populate the array.
Search Input: After filling the array, the program asks the user to enter a value to search for in the array.
Linear Search: It iterates through the array elements one by one and compares each element with the search value.
Result: If the value is found, it displays the index where the value is located. If not, it prints "Not found".

How to learn from this program

First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.

Practice suggestion

After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.