Question

Write a complete JAVA program, including comments (worth 2 pts -- include a good comment at the top and at least one more good comment later in the program), to process data for the registrar as follows: NOTE: Include prompts. Send all output to the screen. 1. Read in the id number of a student, the number of credits the student has, and the student’s grade point average (this is a number like 3.25). Print the original data right after you read it in. A typical set of values could be: 1234 21 2.25 Print something like this: student 1234 has 21 credits and has a grade point average of 2.25 2. If the student has 60 credits or less print this is a lowerclassman, otherwise print this is an upperclassman. Keep a count of how many upperclassmen there are. 3. Compute an adjusted gpa as follows: divide the number of credits by the gpa. Print this value. 4. If the adjusted gpa is 20 or greater, print a message saying this student is above average. Otherwise, print a message saying the student is not above average. 5. a.Compute how many credits the student needs to graduate with 120 credits. Print this message. b. Determine how many semesters it will take the student to graduate assuming the student takes 15 credits per semester. Print this value as an integer. For example, if the student has 80 credits, print “Student needs 40 credits to graduate. It will take 3 semesters to graduate.” (40/15 +1) But if student has 75 credits, there are 45 remaining to graduate, and that will also take 3 semesters. (45/15) So you many need to determine if the number of credits remaining is divisible by 15. 6. Repeat the entire series of calculations for the next student, and the next, until every student has been processed. You must decide how to tell when every student has been processed. Make sure that this method is described in a comment. 7. Print the following values with appropriate message: the total number of students. how many of the students are upperclassmen (#2 above). the percent (with 3 decimal places) of students who are upperclassmen. Suggestion: You will need two separate counters for these tasks.

Answer 1

JAVA CODE:

import java.util.*;
public class Registrar{
    public static int upperClassCounter;
    public static int studentCounter;
    public Registrar(){
        upperClassCounter = 0;
        studentCounter = 0;
    }
    // This program has all the functions from 1 to 5
    public void program(){
        Scanner sc = new Scanner(System.in);
        // Gets ID input
        System.out.println("Input the ID of the student: ");
        int id = sc.nextInt();
        // Gets the number of credits
        System.out.println("Input number of credits: ");
        int numcredits = sc.nextInt();
        // Gets GPA
        System.out.println("Input student's grade point average: ");
        double gpa = sc.nextDouble();
        // sstudentCounter is incremented by 1 everytime this function is called
        studentCounter += 1;
        // Prints the user input
        System.out.println("");
        System.out.println("Student's ID: " + id);
        System.out.println("Number of credits the student has: " + numcredits);
        System.out.println("Student's GPA: " + gpa);
        // Checks if the student is upperclassman or lowerclassman
        if (numcredits < 60){
            System.out.println("This is a lowerclassman.");
        }
        else{
            System.out.println("This is an upperclassman.");
            upperClassCounter += 1;
        }
        // Adjusted GPA is calculated
        double adjustedGPA = Math.round(numcredits*100 / gpa)/100;
        System.out.println("Adjusted GPA: " + adjustedGPA);
        // Checks if the student is above average or not
        if (adjustedGPA >= 20){
            System.out.println("The student is above average.");
        }
        else{
            System.out.println("The student is not above average.");
        }
        // Calculates the credits needed to graduate
        int creditsToGraduate = 120 - numcredits;
        System.out.println("Student needs " + creditsToGraduate + " credits to graduate.");
        // Calculates the semester needed to complete 
        double semesterNeeded;
        if(creditsToGraduate % 15 == 0){
            semesterNeeded = creditsToGraduate / 15;
        }
        else{
            semesterNeeded = (creditsToGraduate/15 + 1);
        }
        System.out.println(semesterNeeded);
    }
    public static void main(String[] args){
        Registrar r1 = new Registrar();
        // Gets number of students from the user
        System.out.println("Enter the number of students to process: ");
        Scanner sc = new Scanner(System.in);
        int numStudents = sc.nextInt();
        // This loop will keep running for all the students
        while(numStudents > studentCounter){
            r1.program();
        }
        System.out.println("");
        // Final information is printed
        System.out.println("Every Student has been processed.");
        System.out.println("Total number of students: " + studentCounter);
        System.out.println("Number of students who are upperclassmen: " + 
                upperClassCounter);
        double percentUpper = (double) Math.round((double) upperClassCounter * 100000 /(double) studentCounter) / 1000;
        System.out.printf("Percentage of students who are upperclassmen: " +  percentUpper);
    
    }
}

OUTPUT:

Enter the number of students to process: 5 Input the ID of the student: 1234 Input number of credits: 21 Input student's grade point average: 2.25 Student's ID: 1234 Number of credits the student has: 21 Student's GPA: 2.25 This is a lowerclassman. Adjusted GPA: 9.0 The student is not above average. Student needs 99 credits to graduate. 7.0 Input the ID of the student: 3256 Input number of credits: 65 Input student's grade point average: 3.0 Student's ID: 3256 Number of credits the student has: 65 Student's GPA: 3.0 This is an upperclassman. Adjusted GPA: 21.0 The student is above average. Student needs 55 credits to graduate. 4.0

Input the ID of the student: 5698 Input number of credits: 60 Input student's grade point average: 3 Student's ID: 5698 Number of credits the student has: 60 Student's GPA: 3.0 This is an upperclassman. Adjusted GPA: 20.0 The student is above average. Student needs 60 credits to graduate. 4.0 Input the ID of the student: 6589 Input number of credits: 80 Input student's grade point average: 3 Student's ID: 6589 Number of credits the student has: 80 Student's GPA: 3.0 This is an upperclassman. Adjusted GPA: 26.0 The student is above average. Student needs 40 credits to graduate. 3.0