1. Write a Java application that asks the user to enter the scores in 3 differen

Question

1. Write a Java application that asks the user to enter the scores in 3 different tests (test1, test2, test3) for 5 students into a 2D array of doubles. The program should calculate the average score in the 3 tests for each student, as well as the average of all students for test1, test2 and test3.

2. Create a text file (you can name it sales.txt) that contains in each line the daily sales of a company for a whole month. Then write a Java application that: asks the user for the name of the file, reads the total amount of sales, calculates the average daily sales and displays the total and average sales. (Note: Use an ArrayList to store the data).

Please do the program separately and take your time

Explanation / Answer

Quesiton 1:

StudentTests.java

import java.util.Scanner;

public class StudentTests {

  
   public static void main(String[] args) {
       double tests[][] = new double[5][3];
       Scanner scan = new Scanner(System.in);
       for(int i=0;i<tests.length; i++){
           System.out.print("Enter student "+(i+1)+" scores: ");
           for(int j=0; j<tests[i].length; j++){
               tests[i][j]=scan.nextDouble();
           }
       }
       double totalSum = 0;
       for(int i=0;i<tests.length; i++){
           double eachSum = 0;
           for(int j=0; j<tests[i].length; j++){
               eachSum = eachSum+ tests[i][j];
           }
           totalSum= totalSum+eachSum;
           System.out.println("Student "+(i+1)+" Average: "+(eachSum/3));
       }
       System.out.println("The average of all students: "+(totalSum/5));
   }

}

Question 2:

SalesTest.java

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;

public class SalesTest {

  
   public static void main(String[] args) throws FileNotFoundException {
       ArrayList<Double> list = new ArrayList<Double>();
       Scanner scan = new Scanner(System.in);
       System.out.print("Enter the file name: ");
       String fileName = scan.next();
       File file = new File(fileName);
       if(file.exists()){
       Scanner scan1= new Scanner(file);
       while(scan1.hasNextDouble()){
           list.add(scan1.nextDouble());
       }
       double totalSales = 0;
       for(double sales: list){
           totalSales = totalSales+sales;
       }
       double averageSales = totalSales/list.size();
       System.out.println("Total Sales: "+totalSales);
       System.out.println("Average sales: "+averageSales);
       }
       else{
           System.out.println("File does not exist");
       }

   }

}

Output:

Enter the file name: D:\sales.txt
Total Sales: 450.0
Average sales: 50.0

sales.txt

10

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50

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80

90

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