29. Code an application program that keeps track of student information at your

Question

29.  Code an application program that keeps track of student information at your college. Include their names, identification numbers, and grade point averages in a fully encapsulated, homogeneous sorted singly linked list structure. When launched, the user will be asked to input the initial number of students and the initial data set. Once this is complete, the user will be presented with the following menu:

Enter: 1 to insert a new student's information,

2 to fetch and output a student's information,

3 to delete a student's information,

4 to update a student's information,

5 to output all the student information in sorted order, and

6 to exit the program.

The program should perform an unlimited number of operations until the user enters a 6 to exit the program. If the user requests an operation on a node not in the structure, the program output should be “node not in structure.” Otherwise, the message “operation complete” should be output.

do this in java

Explanation / Answer

import java.io.*;
class Student
{
int rollno;
String name;
int number_of_subjects;
int mark[];

Student(int roll,String stud_name,int noofsub)throws IOException
{
rollno=roll;
name=stud_name;
number_of_subjects= noofsub;
getMarks(noofsub);
}
public void getMarks(int nosub ) throws IOException
{
mark=new int[nosub];
BufferedReader br= new BufferedReader (new InputStreamReader(System.in));
for (int i=0; i<nosub;i++)
{
System.out.println(“Enter “+i+”Subject Marks.:=> “);
mark[i]=Integer.parseInt(br.readLine());
System.out.println(“”);
}

}
public void calculateMarks()
{
double percentage=0;
String grade;
int tmarks=0;
for (int i=0;i<mark.length;i++)
{
tmarks+=mark[i];
}
percentage=tmarks/number_of_subjects;
System.out.println(“Roll Number :=> “+rollno);
System.out.println(“Name Of Student is :=> “+name);
System.out.println(“Number Of Subject :=> “+number_of_subjects);
System.out.println(“Percentage Is :=> “+percentage);

if (percentage>=70)
System.out.println(“Grade Is First Class With Distinction “);
else if(percentage>=60 && percentage<70)
System.out.println(“Grade Is First Class”);
else if(percentage>=50 && percentage<60)
System.out.println(“Grade Is Second Class”);
else if(percentage>=40 && percentage<50)
System.out.println(“Grade Is Pass Class”);
else
System.out.println(“You Are Fail”);
}
}
class StudentDemo
{
public static void main(String args[])throws IOException
{
int rno,no,nostud;
String name;
BufferedReader br= new BufferedReader (new InputStreamReader(System.in));
System.out.println(“Enter How many Students:=> “);
nostud=Integer.parseInt(br.readLine());
Student s[]=new Student[nostud];

for(int i=0;i<nostud;i++)
{
System.out.println(“Enter Roll Number:=> “);
rno=Integer.parseInt(br.readLine());
System.out.println(“Enter Name:=> “);
name=br.readLine();
System.out.println(“Enter No of Subject:=> “);
no=Integer.parseInt(br.readLine());
s[i]=new Student(rno,name,no);
}
for(int i=0;i<nostud;i++)
{
s[i].calculateMarks();
}

}
}

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