Question

DESCRIPTION

Complete the program using Java to read in values from a text file. The values will be the scores on several assignments by the students in a class. Each row of values represents a specific student's scores. Each column represents the scores of all students on a specific assignment. So a specific value is a specific student's score on a specific assignment. The first two values in the text file will give the number of students (number of rows) and the number of assignments (number of columns), respectively.

For example, if the file contains:

3
4
9 6 10 5
2 2 0 0
10 10 9 10

then it represents the scores for 3 students on 4 assignments as follows:

	Assignment 1	Assignment 2	Assignment 3	Assignment 4
Student 1	9	6	10	5
Student 2	2	2	0	0
Student 3	10	10	9	10

The program should:

1) Read in the first two values to get the number of students and number of assignments. Create a two-dimensional array of integers to store all the scores using these dimensions.

2) Read in all the scores into the 2-D array.

3) Print the whole array, row by row on separate lines, using Arrays.toString() on each row of the array

3) Print the average of the scores on each assignment. For example, if the data is given in the above example, the output would be:

Array of scores:
[9, 6, 10, 5]
[2, 2, 0, 0]
[10, 10, 9, 10]

Average score of each assignment:
Assignment #1 Average = 7.0
Assignment #2 Average = 6.0
Assignment #3 Average = 6.333333333333333
Assignment #4 Average = 5.0

Answer 1

Code:

import java.util.*;
import java.io.*;
class ya{
   public static void main(String args[]) throws FileNotFoundException{
       Scanner s=new Scanner(new File("input.txt")); //file name or location
       int a,b;
       a=s.nextInt();
       b=s.nextInt();
       int c[][]=new int[a][b];
       int i,j;
       for(i=0;i<a;i++){
           for(j=0;j<b;j++){
               c[i][j]=s.nextInt();
           }
       }
       System.out.println("Array of scores:");
       for(i=0;i<a;i++){
           System.out.println(Arrays.toString(c[i]));
       }
       System.out.println("\n\nAverage score of each assignment:");
       for(i=0;i<b;i++){
           double sum=0;
           for(j=0;j<a;j++){
               sum=c[j][i]+sum;
           }
           System.out.println("Assignment #"+(i+1)+" Average ="+(sum/a));
       }
   }
}

input.txt:

input.txt - Noter File Edit Format 9 6 10 5 2 200 10 10 9 10

Output:

Array of scores: [9, 6, 10, 5] [2, 2, 0, 0] [10, 10, 9, 10] Average score of each assignment: Assignment #1 Average =7.0 Assignment #2 Average =6.0 Assignment #3 Average =6.333333333333333 Assignment #4 Average =5.0