$/*$ Starter project for Assignment $13$ File I$/$O for Grade Average

Your job is to write a program to read the grades.txt file

in this project, to produce output like shown here.

"grades.txt$"$ is the file your program should read.$$ "badformat.txt$"$ is an example of a file that your program can't read, so a clear error message should be generated, as shown in the sample output.

$*/$

import java.io$.*$;

import java.util.Scanner;

class Main

$\{$

private static final int NUM$\_$SCORES $=4$;

$//$ named constant for the number of scores per student in file

public static void main$($String$[]$ args$)$

$\{$

$\}$

$\}$

$/******$ Sample Output on Repl, hills, or other Linux

$($specifying an invalid path will throw an exception$)$: $*****$

Remember that "cat" is a Linux command to display the

contents of a text file on the screen.

Welcome to the Grade Average Calculator.

Please enter the name of a file to input:

trash

Unable to open file: trash

Please enter the name of a file to input:

grades.txt

Enter name of output file to create:

trash$/$trash

Unable to open file: trash$/$trash

Enter name of output file to create:

gradeAvg.txt

Average grades saved to gradeAvg.txt

$>$ cat grades.txt

Biden $85909598$

Trump $50707580$

Obama $90959897$

Bush $80707585$

Clinton $90958599$

Bush $85959094$

$>$ cat gradeAvg.txt

Here are the average grades:

Biden $92\mathrm{.}0$

Trump $68\mathrm{.}8$

Obama $95\mathrm{.}0$

Bush $77\mathrm{.}5$

Clinton $92\mathrm{.}3$

Bush $91\mathrm{.}0$

$>$ java Main

Welcome to the Grade Average Calculator.

Please enter the name of a file to input:

badformat.txt

Enter name of output file to create:

gradeAvg.txt

The file badformat.txt isn't in the right format:

it should have $1$ name followed by $4$ numbers on each line,

separated by spaces. The following error was generated:

$4$ scores should follow each name, with spaces in between.

Grades could not be averaged.

$>$ cat badformat.txt

Biden $8590$

Trump $507075$

Obama $90959897$

Bush $80707585$

Clinton $90958599$Bush $85959094$

$*/$

badformat.txt $-$ Biden $8590$

Trump $507075$

Obama $90959897$

Bush $80707585$

Clinton $90958599$Bush $85959094$

grades.txt $-$ Biden $85909598$

Trump $50707580$

Obama $90959897$

Bush $80707585$

Clinton $90958599$

Bush $85959094$