I have this program that I\'ve been working on that I managed to get running wit
ID: 3833702 • Letter: I
Question
I have this program that I've been working on that I managed to get running with help, however it's not printing the names or the letter grades of the students. I have the instructions for the lab below and links to the current version of the lab, names and student files.
LAB09, Array of objects – Binary Search, Sequential Search Points: 25
OBJECTIVE
To demonstrate using parallel arrays
To demonstrate using a binary search through arrays
To demonstrate using a sequential search through arrays
REQUIRED
A report of your work, in a flat pocket folder, in the following order:
1. Grade Form
2. This program description
3. The source listing of the Student class Student.java
4. Problem Analysis with Input, Output, Pseudocode (word processed)
5. The listing of the source program Lab09.java
Data dictionary (included as comments)
6. Listing of the input file Lab09StudentFile.txt
7. Listing of the student name file Lab09Names.txt
8. Listing of the expected results (already created) Lab09ExpectedResults.xlsx
9. Listing of the output file Lab09Report.txt
SPECIFICATIONS
Start with Lab08
1. Instead of doing a sequential search through the names file, load the file into two parallel arrays. Parallel arrays are arrays that are linked positionally. For this application, create an array for the student number and an array for the student name. This should be done in main.
2. Do a binary search to locate the student name. Use a method for the binary search. See Java13BinarySearch and Java13BinarySearchTrace.
3. Set up the letter grade and low range in parallel arrays. Create an array for the low end of the range and an array for the letter grade. This should be done in main
4. Convert the average to a letter grade.
Use a method and a sequential search to select the letter grade.
Instead of doing an “==” comparison, use a “>=” comparison on the low end of the grade range.
FOR EXAMPLE:
First time through the search loop, if average is >= low (97), then grade is an ‘A+’
If not an ’A+’, then average MUST be 96 or less, so if average >= low (93), then grade is an ‘A’
If not an ’A’, then average MUST be 92 or less, so if average >= low (90), then grade is an ‘A-’
Etc.
Exit the search when the correct grade is found or when the search is over
Grade low - high
A+ 97%-100%
A 93%-96%
A- 90%-92%
B+ 87%- 89%
B 83%- 86%
B- 80%- 82%
C+ 77%- 79%
C 73%- 76%
C- 70%- 72%
D+ 67%- 69%
D 63%- 66%
D- 60% - 62%
F 00%- 59%
INPUT
File: Student file Lab09StudentFile.txt
Record: Student record
Field Data Type
Student id# 4 numbers (ex. 1234)
Ten test scores integers (valid numbers are 0 -100)
INPUT
File: Student name file Lab09Names.txt
Record: Student name record
Field Data Type
Student id# 4 numbers (ex. 1234)
Student name String
OUTPUT
File: Grade Report file LAB09Report.txt
Record:
Student Grade Report, sorted by Name
ID# Name /---------------------TEST Scores----------------------/ Total Adj Total Avg Grade
xxxx xxxxxxxxxxxxxxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxxx xxxx xxx xx
xxxx xxxxxxxxxxxxxxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxxx xxxx xxx xx
xxxx xxxxxxxxxxxxxxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxxx xxxx xxx xx
Total students = xx
Here's a link to what I have so far for lab09.--> https://pastebin.com/3xsgxMB2
Here's the link to the completed Student Class file.--> https://pastebin.com/DvZvKq2M
Here's a link to the Lab09Names file.--> https://pastebin.com/hVsq0Pwk
here's a link to the Lab09StudentFile.--> https://pastebin.com/pkaT9xpR
Explanation / Answer
Hi, I have fixed all the issue.
It is working fine now.
Please let me know in case of any issue.
//Lab09
//this makes available all extra utilities from Java library including scanner
import java.util.*;
//this makes available all extras from Java library needed for files
import java.io.*; //needed for files
public class Lab09
{//start of class
public static void main(String[] args) throws FileNotFoundException
{
//start of main method
//declare a variable of type Scanner
Scanner infileName = new Scanner(new FileReader("Lab09StudentFile.txt"));
PrintWriter outfileName = new PrintWriter ("Lab09Report.txt");
//variables and defined constants
String studentName; //need studentName for searchName variable
int stdId; //student id number
int[] scores = new int[10]; //test scores
int x = 0; //variable for a single instance of the student class
int student = 0; //student variable initialized to zero
Student[] arrayStudent = new Student[16]; //array of student class objects
StudentSort[] arrayStudentSort = new StudentSort[16];
// arrays to store their ids and names
int[] ids = new int[20];
String[] names = new String[20];
// loading name and id
int c = 0;
Scanner nameFileScanner = new Scanner (new FileReader("Lab09Names.txt"));
while (nameFileScanner.hasNext())
{//start while loop
int id = nameFileScanner.nextInt();
String name = nameFileScanner.nextLine().trim();
ids[c] = id;
names[c] = name;
c++;
}//end while
nameFileScanner.close();
//create an instance of printwriter object
outfileName.println("Student Grade Report");
outfileName.println();
outfileName.println("ID# Name /-------------------Test Scores----------------/ Total AdjTotal Avg");
outfileName.println();
//read score until end of file
while(infileName.hasNext())
{//start while loop
stdId = infileName.nextInt();
for (int i = 0; i < scores.length; i++)
{
scores[i] = infileName.nextInt();
}
Student std = new Student(stdId, scores);
arrayStudent[x] = std;
//studentName = searchName(stdId); //assigning searchName to studentName
studentName = binarySearch(ids, names,std.getStudentId());
StudentSort stdObject = new StudentSort(x, studentName); //created StudentSort array, used x (stdId) to search for name
arrayStudentSort[x] = stdObject; //arrayStudentSort inserts stdObject into the array
x++;
student++;
}//end while
//calls selectionSort method
selectionSort(arrayStudentSort);
for (int j = 0; j < arrayStudent.length; j++)
{//start for loop
StudentSort outObject = arrayStudentSort[j];
int k = outObject.getStudentSub();
Student std = arrayStudent[k];
outfileName.printf("%-5d", std.getStudentId());
scores = std.getStudentGradeArray();
outfileName.printf("%-20s", outObject.getStudentName());
for (int i = 0; i < scores.length; i++)
{
outfileName.printf("%-5d", scores[i]);
}
//write total, ajdusted total and adjusted average
outfileName.printf("%8.0f%8.0f%8.0f",
std.getTotal(),
std.getAdjustedtotal(),
std.getAdjustedAverage());
outfileName.println();
}//end for loop
outfileName.println();
outfileName.printf ("Total Students = %2d", student);
infileName.close();
outfileName.close();
}//end of main
private static void bubbleSort(Student[] arrayStudent)
{//begin method
for (int i = 0; i < arrayStudent.length; i++)
{
for (int j = 0; j < arrayStudent.length-1-i; j++)
{
if (arrayStudent[j].getAdjustedAverage() >arrayStudent[j+1].getAdjustedAverage())
{
Student temp = new Student();
//set arrayStudent at index=j to temp object
temp.setStudentId(arrayStudent[j].getStudentId());
temp.setStudentGradeArray(arrayStudent[j].getStudentGradeArray());
//set arrayStudent at index=j+1 to arrayStudent object
arrayStudent[j].setStudentId(arrayStudent[j+1].getStudentId());
arrayStudent[j].setStudentGradeArray(arrayStudent[j+1].getStudentGradeArray());
//set arrayStudent at index=j+1 to temp object
arrayStudent[j+1].setStudentId(temp.getStudentId());
arrayStudent[j+1].setStudentGradeArray(temp.getStudentGradeArray());
}
}
}
}//end method
public static String searchName(int searchNumber) throws FileNotFoundException
{//begin method
Scanner infileName = new Scanner (new FileReader("Lab09Names.txt"));
boolean found = false;
String returnName = "name not found";
while (infileName.hasNext() && found == false)
{//start while loop
int stdId = infileName.nextInt();
String searchName = infileName.nextLine().trim();
{
if(searchNumber == stdId)
{
returnName = searchName;
found = true;
}
}
}//end while
infileName.close();
return returnName;
}//end of method
//function to sort StudentSort array
public static void selectionSort(StudentSort[] sortStudent)
{//begin method
int n = sortStudent.length;
//One by one move boundary of unsorted subarray
for (int i = 0; i < n-1; i++)
{
//Find the minimum element in unsorted array
int min_idx = i;
for (int j = i+1; j < n; j++)
if (sortStudent[j].getStudentName().compareTo(sortStudent[min_idx].getStudentName()) < 0)
min_idx = j;
//Swap the found minimum element with the first element
StudentSort temp = sortStudent[min_idx];
sortStudent[min_idx] = sortStudent[i];
sortStudent[i] = temp;
}
}//end method
public static String binarySearch(int[] ids, String[] names, int id) {
int start = 0;
int end = ids.length - 1;
String returnName = "name not found";
while (start <= end) {
int mid = (start + end) / 2;
if (id == ids[mid]) {
return names[mid];
}
if (id < ids[mid]) {
end = mid - 1;
} else {
start = mid + 1;
}
}
return returnName;
}
}//end of class
/*
Sample run:
Student Grade Report
ID# Name /-------------------Test Scores----------------/ Total AdjTotal Avg
1225 Caruso, Anthony 70 70 70 70 70 70 70 70 70 70 700 770 77
1555 Collins, Richard 70 70 70 60 65 90 85 80 80 80 750 840 84
1991 Graham, Gary 100 90 75 85 90 88 79 88 91 90 876 976 98
1989 Kelley, Nico 59 59 59 59 59 59 59 59 59 75 606 681 68
1221 Korb, Barbara 100 100 100 100 100 100 100 100 100 100 1000 1100 110
1223 Kramer, Susan 80 80 80 80 80 80 80 80 80 80 800 880 88
1987 Lydon, Arthur 68 68 68 68 68 68 68 68 68 100 712 812 81
1227 Nickerson, Philip 60 60 60 60 60 60 60 60 60 60 600 660 66
1993 Parsons, Michael 91 90 75 85 90 88 79 88 91 90 867 958 96
1222 Schafer, Anne 87 87 87 87 87 87 87 87 87 87 870 957 96
1224 Smith, Lindy 77 77 77 77 77 77 77 77 77 77 770 847 85
1226 Sokalski, Mark 67 67 67 67 67 67 67 67 67 67 670 737 74
1856 Stanson, Luke 60 0 45 68 89 67 60 50 75 80 594 683 68
1343 Vickers, Jerry 90 85 80 65 75 95 85 75 80 94 824 919 92
1228 Wydner, Peter 57 57 57 57 57 57 57 57 57 57 570 627 63
1967 name not found 90 85 87 88 70 90 92 87 88 67 844 936 94
Total Students = 16*/