Programming Example

Question 5: Write a program to input name and percentage of 35 students of class X in two separate one dimensional arrays. Arrange students details according to their percentage in the descending order using selection sort method. Display name and percentage of first ten toppers of the class.

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💻 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:

Expected Output:

Program Code

import java.util.Scanner;

public class RAnsariStudentPercentage
{
     public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        
        //Initialize the 2 SDA
        String names[] = new String[35];
        double percentage[] = new double[35];
        
        /*
         * Accept student details from user and store
         * in corresponding SDA
         */
        for (int i = 0; i < names.length; i++) {
            System.out.print("Enter name of student " 
                                    + (i + 1) + ": ");
            names[i] = in.nextLine();
            System.out.print("Enter percentage of student " 
                                    + (i + 1) + ": ");
            percentage[i] = in.nextDouble();
            in.nextLine();
        }
        
        //Selection Sort in Descending Order
        for (int i = 0; i < percentage.length - 1; i++) {
            int maxIdx = i;
            for (int j = i + 1; j < percentage.length; j++) {
                if (percentage[j] > percentage[maxIdx])
                    maxIdx = j;
            }
            
            double t = percentage[i];
            percentage[i] = percentage[maxIdx];
            percentage[maxIdx] = t;
            
            String name = names[i];
            names[i] = names[maxIdx];
            names[maxIdx] = name;
        }
        
        //Display first ten toppers
        System.out.println("Name\tPercentage");
        for (int  i = 0; i < 10; i++) {
            System.out.println(names[i] + '\t' + percentage[i]);
        }
    }
}

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.