Question

(7) Student grade point statistics [Problem description] There is a need to make statistics of the grade points of the students in the first semester of 2018. It is assumed that there are n (can be set as 6) classes in this grade, and there are 20 students in each class, the total number of courses with exam is m (can be set as 10), and the percentage system is adopted for each course. The gpa is 4, 3, 2,1, (4: 90 100, 3: 80 90, 2: 70 80, 1: 60 70), the credit of Advanced Mathematics, Physics and English are 6, 5, 4 respectively, and the credit of other courses is 2. The calculation method of each student's GPA is: GPA Grade points of each course multiplied by credits, and then divided by the total credits. Write a program to generate the GPA sheet and related statistical tables. [Basic requirements] 1) generate the GPA sheet of each class according to the student number 2) generate a ranking of the top 30% in terms of GPA of the grade by student number (from high to low) 3) calculate the total GPA of each class, 4) the GPA of a student can be inquired according to the student number. If the GPA is among the top 30%, the ranking will be displayed; otherwise only display "the GPA is not among the top 70%" 5) data is stored in files and can be inquired at any time 6) input data form and scope: self-designed course name, student number 1801XX, class number 01, and student number XX Display requirements: there shall a menu to give reasonable prompt. Storage structure: can be designed according to the functional requirements, and the data concerning the scores should be stored in a data file. [Test data] To ensure the robustness of the program, test which are (lega (2) illegal: 3) partially illegal should be used. data [Implementation hint] The name and student id can be written in one data file. For example, the name takes up 10 characters and the student id takes up 6 characters.

Answer 1

Sol:

  CODE IN JAVA:

package javaapplication1;

import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Scanner;

/**
*
* @author pc
*/
//clas student
class Student
{

//getters
public String getName() {
return name;
}

public String getId() {
return Id;
}

public int[] getGrades() {
return grades;
}

public int getClasss() {
return Class;
}

public int getGpa() {
return gpa;
}
//course and credit array
String courses[]={"Advanced Mathematics","Physics","English","Hindi","Chemistry","Biology","Computer Basics","C++","Data Structure","Computer Networks"};
int credit[]={6,5,4,2,2,2,2,2,2,2};
//setter
public void setGrades(int[] grades) {
this.grades = grades;
}
//constructor to initialize the name , id and class value
public Student(String name, String Id,int Class) {
this.name = name;
this.Id = Id;
this.Class=Class;
}
//calculate gpa of this student
public void calculateGPA()
{
gpa=grades[0]*credit[0]+grades[1]*credit[1]+grades[2]*credit[2]+grades[3]*credit[3]+grades[4]*credit[4]+grades[5]*credit[5]+grades[6]*credit[6]+grades[7]*credit[7]+grades[8]*credit[8]+grades[9]
*credit[9];
gpa=gpa/(29);
// its 4 if in between 90 and 100 , 3 if in between 80 and 90 and so on...
if(gpa>90 && gpa<=100)
gpa=4;
else if(gpa>80 && gpa<=90)
gpa=3;
else if(gpa>70 && gpa<=80)
gpa=2;
else
gpa=1;
}
//data members
private String name;
private String Id;
private int grades[]=new int[10];
private int Class;
private int gpa;
}
//to sort by GPA in descending order
class SortbyGPA implements Comparator<Student>
{
// Used for sorting in ascending order of
// roll number
public int compare(Student a, Student b)
{
return b.getGpa() - a.getGpa();
}
}
//main class
public class GradePointStatistics {
public static void main(String[] args) throws Exception{
//arryalist which contain all the students , intially empty
ArrayList<Student> arr=new ArrayList<Student>();
int n=6;//classes in this grade
int noOfStudent=20;//students
int m=10;//courses
int gradePoints[][]=new int[n][noOfStudent];
Scanner sc=new Scanner(new File("D:\\DataInput.txt"));//open file
int i=0;
sc.nextLine();//read first line but dont take it in use
while(sc.hasNextLine())
{
String str[]=sc.nextLine().split("\t");//split lines into array by \t
int grades[]=new int[10];//to put all the grades value in this array
grades[0]=Integer.parseInt(str[3]);
grades[1]=Integer.parseInt(str[4]);
grades[2]=Integer.parseInt(str[5]);
grades[3]=Integer.parseInt(str[6]);
grades[4]=Integer.parseInt(str[7]);
grades[5]=Integer.parseInt(str[8]);
grades[6]=Integer.parseInt(str[9]);
grades[7]=Integer.parseInt(str[10]);
grades[8]=Integer.parseInt(str[11]);
grades[9]=Integer.parseInt(str[12]);
//create student object
Student s=new Student(str[0],str[1],Integer.parseInt(str[2]));
//set its grades
s.setGrades(grades);
s.calculateGPA();//calculate GPA
arr.add(s);//add this student into arraylist
}
  
//prinitng GPA SHEET
System.out.println("----------------GPA Sheet----------------");
System.out.println("Class\tStudentId\tStudentName\tGPA");
for(int j=0;j<arr.size();j++)
{
Student s=arr.get(j);
System.out.println(s.getClasss()+"\t"+s.getId()+"\t"+s.getName()+"\t"+s.getGpa());
}
  
System.out.println("");
  
//Print top 30 % by GPA
ArrayList<Student> arr1=arr;
Collections.sort(arr1, new SortbyGPA());//sort in descending order
int thirtyPercent=n*noOfStudent*30/100;//find how many comes under top 30 %
//ranking
System.out.println("--------------Top 30% Students on the basis of GPA-----------------");
System.out.println("StudentNumber\tClass\tGPA");
for(int j=0;j<thirtyPercent;j++)
{
Student s=arr.get(j);
System.out.println(s.getId()+"\t"+s.getClasss()+"\t"+s.getGpa());
}
System.out.println("");
  
//total GPA by class
System.out.println("----------------Total GPA------------------");
System.out.println("Class\tTOTAl GPA");
for(int j=0;j<arr.size();j=j+noOfStudent)
{
int totalGPA=0;
//calcultae total GPA for the class j having noOfStudents
for(int t=0;t<noOfStudent;t++)
{
Student s=arr.get(j+t);
totalGPA+=s.getGpa();
}
//if j is in between 0 and 20 then its 1st class and so on..
if(j>=0 && j<20)
{
System.out.print("1\t");
}
else if(j>=20 && j<40)
{
System.out.print("2\t");
}if(j>=40 && j<60)
{
System.out.print("3\t");
}if(j>=60 && j<80)
{
System.out.print("4\t");
}if(j>=80 && j<100)
{
System.out.print("5\t");
}if(j>=100 && j<120)
{
System.out.print("6\t");
}
//now print totalGPA
System.out.println(totalGPA);
}
  
//to take user input
Scanner si=new Scanner(System.in);
System.out.println("Please enter Id of student to inquire");
String id=si.next();//take id as user input
int j;
for( j=0;j<arr1.size();j++)
{
if(arr1.get(j).getId().equalsIgnoreCase(id))//if this id matches with any id inside array list of top 30%
{
//then print ranking
System.out.println("--------------Top 30% Students on the basis of GPA-----------------");
System.out.println("StudentNumber\tClass\tGPA");
for(int t=0;t<thirtyPercent;t++)
{
Student s=arr.get(t);
System.out.println(s.getId()+"\t"+s.getClasss()+"\t"+s.getGpa());
}
System.out.println("");
break;
}
}
//if no match found then print the below shown message..
if(j==arr1.size())
{
System.out.println("The student is not among top 30%");
}
}
}

Output:

GPA Sheet- Clas Studen Id StudentlTame GPA 20002 RANI 3 xx003 CANESH 2 XX004 SHrvats3 xx005 RAVI3 xx007 RASHMI 3 xx008 SHYAMA 3 XX009 ADI 2 Xx011 SHANDH 3 xx012 ADITYA 2 xx013 RASHMI 3 xx014 ITIKA 3 Xx016 RADS 3 XX017 SHANKAR 3 xx018 VRINDA 2 xx019 SIA 3 xx020 PAUL3 X.102 RANO XX103 GYAN 2 X.104 HANS 3 X106 NOBITA 2 X.107 RUCHITA3 xx109 GANNU 2 xx111 SHANDH 3 X112 RICHA 2 X.113 ROLI

xx105 TAPDO 3 xx106 NOBITA 2 107 RUCHIIA 3 X108 SHYAMA 3 xx109 GANNU2 xx110 MAHIMA 3 xx111 SHANDH 3 112 RICHA 2 X.113 ROLI xx115 MADAN 2 117 SHANEAR 3 X118 VANAS 2 xx120 SANDEEP 3 SHİVAM 3 Xx202 RANI 3 XX203 GANESH 2 20(205 RAVI 209 JUSTIN 2 XX211 SELENA 3 X212ICHA 2 XX213 RASHMI 3 X214 RITIKA 3 XX215 HELEN 2 xx216 RADS 2 XX217 SHANKAR 3 XX219 SIA 3 XX220 PAUL3

Xx216 RADS 2 Xx217 SHANKAR 3 XX218 VRINDA 2 xx219 STA 3 xx220 PAUL3 X302 RAMA 2 xx305 TAP 3 XX306 NOBITA 2 X309 GANNU 2 xx311 SAVITA 3 Xx312 RICHA 2 XX313 ROLI 3 XX314 RITIKA 3 XX315 HADAN 2 xXx316 RADS 3 xx317 SHRI 3 XX319 SIA 3 X320 HOHANA 3 XX402 RANI Xx403 GANESH 2 404 SHIVAns 3 XX405 RAVI3 K410 MAIMA 3 XX411 SHANDH 3

StudentNumbe Class GPA XX001 1 Xx002 1 xx004 1 XX005 1 xx007 1 XX008 1 Xx0101 Xx0111 xx013 1 xx014 1 XX016 1 xx017 1 Xx0191 xx020 1 XX101 2 Xx102 2 X《104 2 Xx105 2 Xx107 2 XX108 2 XX113 2 XX1142 XX116 2 1 17 2 XX1202 XX201 3 XX2023 X1204 3

Total GPA 2 Class TOTAl GPA Please enter Id of student to inquire XX017 Top 30% Students on the basis of GPA 8 StudentNumbe Class GPA XX002 1 XX0041 XX005 1 X007 1 XX008 1 Xx010 1 Xx0111 13 14 XX0161 Xx0171 Xx019 1 XX020 1 X《104 2 105 2 107 2

xx007 1 XX0101 xx011 1 13 1 XX01 XX0161 X017 XX01 XX020 1 XX101 2 X.102 2 X《104 2 Xx105 2 Xx107 2 X《108 2 XX110 2 XX113 2 XX1142 XX116 2 XX119 2 XX1202 XX201 3 X.202 3 X1204 3 XX207 3 X1208 3 XX210 3 XX211 3 XX213 3 BUILD SUCCESSFUL (total time: 6 seconds)