Write a program that calculates the grades for a course. Your program should pro

Question

Write a program that calculates the grades for a course. Your program should prompt the user for the name of a file that stores exam scores. Each line of the file has the following format: LastName:FirstName:Exam1:Exam2:Exam3

The exams are to be weighted 25% for the first exam, 30% for the second exam, and 45% for the third exam. Based on that, a final grade is to be assigned: A if the total is at least 90, B if it is at last 80, C if it is at least 70, D if it is at least 60, and F otherwise. The highest grade based on the total points is always assigned, so a 75 gets a C.

Your program should output to the terminal a list of students with the letter grade, as follows:

LastName FirstName LetterGrade

It should also output to a file, whose name is provided by the user, lines of the form

LastName FirstName Exam1 Exam2 Exam3 TotalPoints LetterGrade

After it is done, it will output the grade distribution. If the input is:

Doe:John:100:100:100

Pantz:Smartee:80:90:80

Then the terminal output is:

Doe John A

Pantz Smartee B

And the output file will contain:

Doe John 100 100 100 100 A

Pantz Smartee 80 90 80 83 B

A 1

B 1

C 0

D 0

F 0

Explanation / Answer

MarkReader.java

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

public class MarkReader {

public static void main(String[] args) {

BufferedReader bReader = null;

FileReader fReader = null;

BufferedWriter bwriter = null;

FileWriter fWriter= null;

String [] names= new String[2];

int [] mark1 =new int[2];

int [] mark2 =new int[2];

int [] mark3 =new int[2];

String [] grades= new String[2];

//Reading the data from marksInput.txt

try {

fReader = new FileReader("marksInput.txt");

bReader = new BufferedReader(fReader);

String [] strArray =new String[5];

int counter =0;

String cLineStr;

while ((cLineStr = bReader.readLine()) != null) {

strArray = cLineStr.split(":");

names[counter] = strArray[0]+" "+strArray[1];

mark1[counter] = Integer.valueOf(strArray[2]);

mark2[counter] = Integer.valueOf(strArray[3]);

mark3[counter] = Integer.valueOf(strArray[4]);

counter ++;

}

} catch (IOException e) {

System.out.println("Exception");

}

//Finding the grade

double gradeMark = 0;

String grade = "F";

int Acount =0;

int Bcount =0;

int Ccount =0;

int Dcount =0;

int Fcount =0;

String out = "";

for(int i=0;i<names.length;i++){

grade = "F";

gradeMark = (.25 * mark1[i]) +(.3 *mark2[i]) + (.45 * mark3[i]);

if(gradeMark >= 90){

grade = "A";

Acount++;

}

else if( gradeMark >=80)

{

grade = "B";

Bcount++;

}

else if( gradeMark >=70)

{

grade = "C";

Ccount++;

}

else if( gradeMark >=60)

{

grade = "D";

Dcount++;

}

else if( gradeMark < 60){

grade = "F";

Fcount++;

}

grades[i]=grade;

String outTerminal = names[i]+" "+grades[i];

out = out+ names[i]+" "+mark1[i]+" "+mark2[i]+" "+mark3[i]+" "+Double.valueOf(gradeMark).intValue()+" "+grades[i]+" ";

System.out.println(outTerminal);

}

out = out +"A "+Acount+" ";

out = out +"B "+Bcount+" ";

out = out +"C "+Ccount+" ";

out = out +"D "+Dcount+" ";

out = out +"F "+Fcount+" ";

//Writing the output to gradeOutput.txt

try {

fWriter = new FileWriter("gradeOutput.txt");

bwriter = new BufferedWriter(fWriter);

bwriter.write(out);

bwriter.flush();

} catch (IOException e) {

e.printStackTrace();

}

}

}

marksInput.txt

Doe:John:100:100:100
Pantz:Smartee:80:90:80

Console output:

Doe John A
Pantz Smartee B

gradeOutput.txt

Doe John 100 100 100 100 A
Pantz Smartee 80 90 80 83 B
A 1
B 1
C 0
D 0
F 0

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