Question

In Java Programming:

Create a flow chart for a program that prompts for an integer N (number of students) and M (number of test scores for each students), and allows the user to N*M real numbers.

The program then calculates the average for each student and class average.

(1) Prompt the user to input N students and M test scores, then display the inputs.

Enter number of students:

You entered: 2

Enter number of test scores:

You entered: 3

Enter 6 real numbers:


You entered:
85.3    73.4    98.5 
92.1    86.4    88.9

(2) Calculate the averages of each student.

There are 2 students.
The averages for each student are
85.63
89.13

(3) Calculate the class average.

The class average is 87.43.

Answer 1

import java.util.Scanner;

public class ClassAverage {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter number of students: ");
        int N = in.nextInt();
        System.out.println("You entered: " + N);
        System.out.print("Enter number of test scores: ");
        int M = in.nextInt();
        System.out.println("You entered: " + M);
        double[][] scores = new double[N][M];
        System.out.println("Enter " + (M*N) + " real numbers:");
        for(int i = 0; i < scores.length; ++i) {
            for(int j = 0; j < scores[i].length; ++j) {
                scores[i][j] = in.nextDouble();
            }
        }
        System.out.println("You entered:");
        for(int i = 0; i < scores.length; ++i) {
            for(int j = 0; j < scores[i].length; ++j) {
                System.out.print(scores[i][j] + " ");
            }
            System.out.println();
        }
        System.out.println("There are " + N + " students.");
        System.out.println("The averages for each student are");
        double totalSum = 0;
        for(int i = 0; i < scores.length; ++i) {
            double sum = 0;
            for(int j = 0; j < scores[i].length; ++j) {
                sum += scores[i][j];
            }
            totalSum += sum;
            System.out.printf("%.2f\n", sum / scores[i].length);
        }
        System.out.printf("The class average is %.2f.\n", totalSum / (N*M));
    }

}