Question

Write a program that will calculate your letter grade at the end of the semester for CSIS130.

Your program will read an input file that shall contain all the tests scores and lab scores for the semester, and the input file data should be in the following format:

full name of student

Test1 Score (0…100),

Test2 Score (0..100) ,

Final Exam Score (0..100),

Total Number of Labs: N

NLab Scores (0=Fail, 1=Pass) [You will have N lab scores each separated by a blank

The program will then calculate 1:your average lab grade  from 100, 2: your final class numeric grade from 100 and the final class letter grade. The output will look like:

Student:  Full Name

Lab Numeric Grade: 0,…,100*

Course Numeric Grade: 0,..,100*

Course  Letter Grade: A,…,F*

Grades are distributed as follows:

LabsPercentage: 20%

Test1Percentage: 20%

Test2Percentage: 20%

FinalExamPercentage: 40%

Letter Grade Distribution is as follows:

A:94-100       A-:90-93

B+:87-89            B:84-86          B-:80-83

C+:77-79            C:74-76         C-:70-73

D+:67-69            D:64-66         D-:60-63

F:0-59                 FN:0-59

*To calculate Lab numeric grade: sum all lab scores then divide by total number of labs, then multiply by 100.

* To calculate Course Numeric grade:

NumericScore=

Test1* Test1Percentage  + Test2*Test2Percentage  + FinalExam* FinalExamPercentage + LabNumericGrade* LabsPercentage

Note, While reading the data from the input file the program must not crash, rather your program must catch the following exceptions

If  FileNotFoundException, incase user enters a wrong file name to read from

Program display message wrong file and loops back to ask for the proper filename

If InputMismatchException, incase you where expecting a certain type o finput but read a different type then Print a message wrong data type read , then Print program will terminate, then end the program with System.exit(0);

Example:  Input to file:

Enter file Name: my130grades.txt

[my130grades.txt  data ]

Mariam Aron

70

85

90

4

1

1

1

0

Output of program, for the above input:

Student: Mariam Aron

Lab Numeric Grade: 75

Course Numeric Grade: 82.80

Course Letter Grade: B-

Answer 1

Program:

//importing required classes
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

//defining class
public class LetterGrade {
    //defining main method
    public static void main(String[] args) throws IOException {
        //variables
        int test1=0,test2=0,finalExam=0,lab[],labsum=0;
        double labNumericGrade=0,numericScore,labsPercentage=0.2,test1Percentage=0.2,test2Percentage=0.2,finalExamPercentage=0.4;
        String name="",file,val,letterGrade="";
        BufferedReader br;
        FileReader fr;
        boolean error;
        //asking for user input
        Scanner input=new Scanner(System.in);
        do{
            error=false;
        System.out.print("Enter the file name: ");
        file=input.nextLine();
        try{
            fr=new FileReader(file);
            br=new BufferedReader(fr);
        //reading data from file
        while((val=br.readLine())!=null){
            name=val;
            test1=Integer.parseInt(br.readLine());
            test2=Integer.parseInt(br.readLine());
            finalExam=Integer.parseInt(br.readLine());
            lab=new int[Integer.parseInt(br.readLine())];
            for(int i=0;i<lab.length;i++){
                lab[i]=Integer.parseInt(br.readLine());
                labsum=labsum+lab[i];
            }
            //calculating the grrades
            labNumericGrade=(labsum*100/lab.length);
            numericScore=test1* test1Percentage + test2*test2Percentage + finalExam* finalExamPercentage + labNumericGrade* labsPercentage;
            if(numericScore>=94){
                letterGrade="A";
            }
            else if(numericScore<94 && numericScore>=90){
                letterGrade="A-";
            }
            else if(numericScore<90 && numericScore>=87){
                letterGrade="B+";
            }
            else if(numericScore<87 && numericScore>=84){
                letterGrade="B";
            }
            else if(numericScore<84 && numericScore>=80){
                letterGrade="B-";
            }
            else if(numericScore<80 && numericScore>=77){
                letterGrade="C+";
            }
            else if(numericScore<77 && numericScore>=74){
                letterGrade="C";
            }
            else if(numericScore<74 && numericScore>=70){
                letterGrade="C-";
            }
            else if(numericScore<70 && numericScore>=67){
                letterGrade="D+";
            }
            else if(numericScore<67 && numericScore>=64){
                letterGrade="D";
            }
            else if(numericScore<64 && numericScore>=60){
                letterGrade="D-";
            }
            else if(numericScore<60 && numericScore>=50){
                letterGrade="F";
            }
            else {
                letterGrade="FN";
            }
            //printing the details
            System.out.println("Student: "+name);
            System.out.println("Lab Numeric Grade: "+labNumericGrade);
            System.out.println("Course Numeric Grade: "+numericScore);
            System.out.println("Course Letter Grade: "+letterGrade);
        }
        }
        catch(FileNotFoundException fn){
            error=true;
        }
        //repeating for wrong user input
        }while(error=true);
    }
}

Output: