In JAVA please Objective: File Input output and flow of control. USING ARRAYS is
ID: 3789858 • Letter: I
Question
In JAVA please
Objective: File Input output and flow of control. USING ARRAYS is not required for this assignment.
Description: The program should first input the number of scores (that will be a fixed number for all students). Your program should also input the name of the file containing the scores of students.
The sample input file of student scores looks like this:
15 51 55 50 52
25 80 -1 70 -1
23 53 -1 57 40
21 50 -1 49 50
Each line represents one student. The first column is the student ID and the remaining columns are scores made by the student.
Two example files - “student1.txt” and “student2.txt” are given on BlackBoard along with this question. -1 represents an excused score.
Your program should read the scores of each student and compute the average score for each student and output the grade of S(satisfactory) or U(unsatisfactory) or I(incomplete). -1 represents an excused score. If a student has 2 or more excused absences, then do not compute the average and give the student a letter grade of I. If the student has less than 2 excused absences then compute the average and determine the grade. Of course for a student with 1 excused absence the average should not count the –1 score. For example, if the input scores for a student were 53, -1, 49 and 50, your program would ignore the -1, since this is the student’s only absence. For this student average will be (53+49+50)/3. The letter grade of S should be assigned if the student's average is 50.0 or above and letter grade U if it is below 50.0.
At the end of the program the program should print out a summary of how many students made S, U and I.
NOTE: YOUR PROGRAM SHOULD WORK FOR ANY NUMBER OF STUDENTS IN THE FILE.
Input: the input user should enter the name of the file and the number of scores for the given semester.
Below is a sample I/O. Only the bolded words are the inputs provided by the user.
Enter the name of the file that has the scores of students: student1.txt
Enter the number of scores for each student: 4
Output: the program should write student ID and grade to an output file. The program should also print summary of how many students made S, U and I to the output file.
Let’s say if the input file of student scores looks like this:
15 51 55 50 52
25 80 -1 70 -1
23 53 -1 57 40
21 50 -1 49 50
The output file should look like this
ID=15 Avg=52 Grade=S
ID=25 Excused=2 Grade=I
ID=23 Avg=50.0 Grade=S
ID=21 Avg=49.7 Grade=U
Number of Grades of Type
S U I
2 1 1
Explanation / Answer
Hi,
Please see below the Java classes. Please comment for any queries/feedbacks.
Thanks,
Anita
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
import java.util.StringTokenizer;
public class StudentScore {
public static void main(String [] args){
String fileName ="";
String outfileName ="outputScore.txt";
String numberOfScoresStr ="";
int noOfScores = 0;
Scanner scan = new Scanner(System.in);
System.out.println("Enter the name of the file that has the scores of students: ");
fileName = scan.nextLine();
System.out.println("Enter the number of scores for each student: ");
numberOfScoresStr = scan.nextLine();
noOfScores = Integer.valueOf(numberOfScoresStr);
//Reading the file
BufferedReader br = null;
BufferedWriter bw =null;
FileReader fr = null;
FileWriter fw = null;
String studentId="";
boolean isIDSet = false;
int scoresSum = 0;
int excuseCount = 0;
int scoreCount = 0;
double average =0;
String grade = "";
int gradeSCount = 0;
int gradeICount = 0;
int gradeUCount = 0;
try {
fw = new FileWriter(outfileName);
bw = new BufferedWriter(fw);
fr = new FileReader(fileName);
br = new BufferedReader(fr);
String sCurrentLine;
while ((sCurrentLine = br.readLine()) != null) {
isIDSet = false;
scoresSum = 0;
excuseCount =0 ;
scoreCount = 0;
scoresSum = 0;
//reading each string from the lines
StringTokenizer st = new StringTokenizer(sCurrentLine);
while (st.hasMoreTokens()) {
String currentElement = st.nextToken() ;
if(!isIDSet){
studentId= currentElement;
isIDSet =true;
}
else if("-1".equalsIgnoreCase(currentElement)){
excuseCount= excuseCount + 1;
}
else{
scoreCount = scoreCount +1;
scoresSum = scoresSum + Integer.valueOf(currentElement);
}
}
//calculating average
if(excuseCount >= 2 ){
grade = "I";
gradeICount = gradeICount + 1;
}
else if(noOfScores >= scoreCount && excuseCount<=1 ){
average = scoresSum / scoreCount;
if(average >= 50.0){
grade = "S";
gradeSCount =gradeSCount +1;
}
else{
grade = "U";
gradeUCount = gradeUCount + 1;
}
}
//Writing output to file
String content ="ID="+studentId+" Avg="+average+" Grade="+grade;
bw.write(content);
String content1 = "This is the content to writessss into file ";
fw = new FileWriter("outputScore.txt");
bw = new BufferedWriter(fw);
bw.write(content1);
}
System.out.println("Number of Grades of Type ");
System.out.println(" S U I");
System.out.println(" "+gradeSCount +" "+gradeUCount+" "+gradeICount);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (br != null)
br.close();
if (fr != null)
fr.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
}
Sample output :
Enter the name of the file that has the scores of students:
student1.txt
Enter the number of scores for each student:
4
Number of Grades of Type
S U I
2 1 1
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