Question

Write a grading program in Java for a class with the following grading policies: There are three quizzes, each graded on the basis of 10 points. There is one midterm exam, graded on the basis of 100 points. There is one final exam, graded on the basis of 100 points. The final exam counts for 40% of the grade. The midterm counts for 35% of the grade. The three quizzes together count for a total of 25% of the grade. (Do not forget to convert the quiz scores to percentages before they are averaged in.) Any grade of 90 or more is an A, any grade of 80 or more (but less than 90) is a B, any grade of 70 or more (but less than 80) is a C, any grade of 60 or more (but less than 70) is a D, and any grade below 60 is an F. The program should read in the student’s scores and output the student’s record, which consists of three quiz scores and two exam scores, as well as the student’s overall numeric score for the entire course and final letter grade. Define and use a class for the student record. The class should have instance variables for the quizzes, midterm, final, overall numeric score for the course, and final letter grade. The overall numeric score is a number in the range 0 to 100, which represents the weighted average of the student’s work. The class should have methods to compute the overall numeric grade and the final letter grade. These last methods should be void methods that set the appropriate instance variables. Your class should have a reasonable set of accessor and mutator methods, an equals method, and a toString method, whether or not your program uses them. You may add other methods if you wish.

Answer 1

// StudentRecords.java

import java.util.Scanner;
class StudentRecords {
   float quiz1,quiz2,quiz3,midterm,finalexam;
   //calculating quiz percent for 25%
   float quizPercent(float quiz1,float quiz2,float quiz3){
       this.quiz1=quiz1;
       this.quiz2=quiz2;
       this.quiz3=quiz3;
       float quizPer = (quiz1*10+quiz2*10+quiz3*10)/3;
       float quizavg = (quizPer/100)*25;
       return quizavg;
   }
   //claculating mid term percent for 35%
   float midtermPercent(float midterm){
       this.midterm = midterm;
       float midtermAvg = (midterm/100)*35;
       return midtermAvg;
   }
   //calculating final exam percent for 40%
   float finalexamPercent(float finalexam){
       this.finalexam = finalexam;
       float finalexamavg = (finalexam/100)*40;
       return finalexamavg;
      
   }
   //calculating overall numeric grade
   float overallNumericScore(float quiz,float mid,float Final){
       float numericGrade = (quiz+mid+Final);
       return numericGrade;
   }
   //calculaing final letter grade
   String letterGradeScore(float numericGrade){
       if(numericGrade>=90 && numericGrade<=100)
           return "A";
       else if(numericGrade>=80 && numericGrade<90)
           return "B";
       else if(numericGrade>=70 && numericGrade<80)
           return "C";
       else if(numericGrade>=60 && numericGrade<70)
           return "D";
       else if(numericGrade>=0 && numericGrade<60)
           return "F";
       else
           return null;
   }

   public static void main(String[] args) {
       Scanner read = new Scanner(System.in);   //for reading input from user
       float quiz1,quiz2,quiz3,midterm,finalexam;
       //taking marks points from user
       System.out.print("Enter quiz 1 points : ");
       quiz1 = read.nextInt();
       System.out.print("Enter quiz 2 points : ");
       quiz2 = read.nextInt();
       System.out.print("Enter quiz 3 points : ");
       quiz3 = read.nextInt();
       System.out.print("Enter mid term points : ");
       midterm = read.nextInt();
       System.out.print("Enter final exam points : ");
       finalexam = read.nextInt();
       //object creation
       StudentRecords obj = new StudentRecords();
       float quiz = obj. quizPercent(quiz1,quiz2,quiz3);
       float mid = obj.midtermPercent(midterm);
       float Final = obj.finalexamPercent(finalexam);
       float numericGarde=obj.overallNumericScore(quiz,mid,Final);
       String letterGrade =obj.letterGradeScore(numericGarde);
       //displaying results
       System.out.println("numeric Grade : " + (int)numericGarde );
       System.out.println("Letter Grade : " + letterGrade );
   }
}