Question

The annual examination results of 50 students in a class is tabulated as follows :

Write a program to read the data, calculate and display the following : 

(a) Average marks obtained by each student. 

(b) Print the roll number and average marks of the students whose average mark is above 80. 

(c) Print the roll number and average marks of the students whose average mark is below 40.

Answer 1

import java. io.*;

Comments

import java.util.Scanner;

public class ExamResult
{
    public static void main(String args[]) {
        final int TOTAL_STUDENTS = 50;
        Scanner in = new Scanner(System.in);
        
        int rollNo[] = new int[TOTAL_STUDENTS];
        int sA[] = new int[TOTAL_STUDENTS];
        int sB[] = new int[TOTAL_STUDENTS];
        int sC[] = new int[TOTAL_STUDENTS];
        double avg[] = new double[TOTAL_STUDENTS];
        
        for (int i = 0; i < TOTAL_STUDENTS; i++) {
            System.out.println("Enter student " + (i+1) + " details:");
            System.out.print("Roll No: ");
            rollNo[i] = in.nextInt();
            System.out.print("Subject A Marks: ");
            sA[i] = in.nextInt();
            System.out.print("Subject B Marks: ");
            sB[i] = in.nextInt();
            System.out.print("Subject C Marks: ");
            sC[i] = in.nextInt();
            avg[i] = (sA[i] + sB[i] + sC[i]) / 3.0;
        }
        
        System.out.println("\nRoll No\tAverage Marks");
        for (int i = 0; i < TOTAL_STUDENTS; i++) {
            System.out.println(rollNo[i] + "\t" + avg[i]);
        }
        
        System.out.println("\nStudents with Average above 80:");
        for (int i = 0; i < TOTAL_STUDENTS; i++) {
            if (avg[i] > 80)
                System.out.println(rollNo[i] + "\t" + avg[i]);
        }
        
        System.out.println("\nStudents with Average below 40:");
        for (int i = 0; i < TOTAL_STUDENTS; i++) {
            if (avg[i] < 40)
                System.out.println(rollNo[i] + "\t" + avg[i]);
        }
    }
}