Question

Write a class that reads data from 'Grades.txt' calculates average grade and output the data t 'Grades_average.txt'in JAVA

public class CH10 Grader_main { CH10 Grade public static void main(String [ ] args) { String fileName = "StudentGrades.txt"; String outfile Name-"StudentGrades_average.txt"; CH10 Graderrun(filename, outfileName) ? Name,StudentNum, Java, DataStructure,OpenSource, Cal1 aman,201601,70,30.10,20 bman,201602,30,30,20,20 cman 201603.30,70,30.40 dman,201604,10,70,50,50 eman,201605,60,60.60,90 fman,201606,80,50,50,10 gman,201607,10,10,80,80 hman,201608,20,30.10,20 Input file('Grades.txt) Name,StudentNum,Java,DataStructure,OpenSourca, Cal1, Average aman,201601,70,30,10,20,32.5 bman,201602,30,30.20,20.25.0 aman,201603,30,70,30.40,42.5 dman,201604,10,70,50,50.45.0 eman,201605,60,60,60,90,67.5 fman.201606,80,50,50.10,47.5 Output file ('Grades_average.txt) man201607.10.10.80,80.45.0 hman,201608,20,30,10,20,20.0 Average 000000.38.75.43.75,38.75,41.25.40.625

Answer 1

JAVA CODE

import java.io.IOException;
import java.io.BufferedReader; // FILE READING
import java.io.FileReader; // FILE READING
import java.io.BufferedWriter; // FILE WRITER
import java.io.FileWriter; // FILE WRITER
/*READING STUDENT DATA FROM A FILE THEN CALCULATE AVERAGE THEN STORE RESULT WITH STUDENT DATA TO ANOTHER FILE*/
class Grades
{
   public static void main(String a[])
   {
       try /// IOEXCEPTION FOR FILE READING AND WRITING
       {
           double Totsub1=0; // TO STORE TOTAL SUBJECT 1 FO ALL STIDENTS
           double Totsub2=0; // TO STORE TOTAL SUBJECT 2 FO ALL STIDENTS
           double Totsub3=0;
           double Totsub4=0;
           double TotAvg=0;
           int sub1,sub2,sub3,sub4; // STORE INDIVIDUAL SUBJECTS FOR A STUDENT , TOTAL 4 SUBJECTS

           //READING FROM FILE
           FileReader fr = new FileReader("Grades.txt"); // FILE CREATED Grades.txt
           BufferedReader ReadFileBuffer = new BufferedReader(fr); //FILE OPEN USING BufferedReader

           FileWriter fw = new FileWriter("Grades_Average.txt"); // file CREATED FOR WRIITING Grades_Average.txt
           BufferedWriter WriteFileBuffer = new BufferedWriter(fw);

           String data,Header;

           Header=ReadFileBuffer.readLine(); // READS FIRST HEADER ROW LINE FROM FILE

           WriteFileBuffer.write(Header+",Average"); // ADD A NEW COULUMN TO THE HEADER
           WriteFileBuffer.newLine(); // WRITE THE HEADER TO THE WRITE FILE

           int totStud=0; // USER FOR AVERAGE COUNTING

           while ((data=ReadFileBuffer.readLine()) !=null) //READING FILE LINE BY LINE
           {
               System.out.println(data); // PRINT THE MESSAGE
               String[] StudentData = data.split(","); /// SPLITT ALL DATAS OF A STUDENT

               // SUBJECT 1 IS AT POSTION INDEX OF 2 IN THE STRING ARRAY, SO NEED CASTING FROM STRING TO INT
               sub1=Integer.parseInt( StudentData[2]);
               sub2=Integer.parseInt( StudentData[3]);
               sub3=Integer.parseInt( StudentData[4]);
               sub4=Integer.parseInt( StudentData[5]);

               // SUBJECTWISE SUMMATION
               Totsub1=Totsub1+sub1;
               Totsub2=Totsub2+sub2;
               Totsub3=Totsub3+sub3;
               Totsub4=Totsub4+sub4;

               Double avg=(sub1 + sub2+ sub3+sub4) /4.0; // FIND AVERAGE FOR 4 SUBJECTS

               TotAvg=TotAvg+avg;

               WriteFileBuffer.write(data+','+avg); // WRITE STUDENT DATA WITH SUBEJCT AVERAGE TO WRITE FILE
               WriteFileBuffer.newLine(); // NEW LINE AFTER EACH INTEGER VALUE

               totStud++;
           }

           // WRITE FOOTER DATA, ALL AVERAGE IN SUBJECTS AND TOTAL AVERAGE TO WRITE FILE
           String footer="Average,00000,"+Totsub1/totStud+","+Totsub2/totStud+","+Totsub3/totStud+","+Totsub4/totStud+","+TotAvg/totStud;
           WriteFileBuffer.write(footer);

           ReadFileBuffer.close(); // CLOSE ReadFileBuffer
           WriteFileBuffer.close(); // CLOSE BufferedWriter

           System.out.println(" Average Grade Generated ");
       }
       catch (IOException e)
       {
           System.out.println(e); // IF ANY IO ERROR
       }
   } // MAIN METHOD END

} // END OF CLASS

SCREENSHOT CODE

import java.io.IOException; import java.io. BufferedReader; // FILE READING import java.io.FileReader; // FILE READING import java.io. BufferedWriter; // FILE WRITER import java.io.FileWriter; // FILE WRITER /*READING STUDENT DATA FROM FILE THEN CALCULATE AVERAGE THEN STORE RESULT WITH STUDENT DATA TO ANOTHER FILE*/ class Grades public static void main(String a[]) try /// IOEXCEPTION FOR FILE READING AND WRITING double Totsubl=0; // TO STORE TOTAL SUBJECT 1 FO ALL STIDENTS double Totsub2=0; // TO STORE TOTAL SUBJECT 2 FO ALL STIDENTS double Totsub3=0; double Totsub4=0; double TotAvg=0; int subl, sub2, sub3, sub4; // STORE INDIVIDUAL SUBJECTS FOR A STUDENT, TOTAL 4 SUBJECTS //READING FROM FILE FileReader fr = new FileReader("Grades.txt"); // FILE CREATED Grades.txt BufferedReader ReadFileBuffer = new BufferedReader (fr); //FILE OPEN USING BufferedReader FileWriter fw = new FileWriter ("Grades_Average.txt"); // file CREATED FOR WRIITING Grades_Average.txt BufferedWriter Write FileBuffer = new BufferedWriter (fw); String data, Header; Header=ReadFileBuffer.readLine(); // READS FIRST HEADER ROW LINE FROM FILE WriteFileBuffer.write (Header+", Average"); // ADD A NEW COULUMN TO THE HEADER WriteFileBuffer.newLine(); // WRITE THE HEADER TO THE WRITE FILE int totStud=0; // USER FOR AVERAGE COUNTING

while ((data=ReadFileBuffer.readLine()) !=null) //READING FILE LINE BY LINE System.out.println (data); // PRINT THE MESSAGE String[] Student Data - data.split(""); /// SPLITT ALL DATAS OF A STUDENT // SUBJECT 1 IS AT POSTION INDEX OF 2 IN THE STRING ARRAY, SO NEED CASTING FROM STRING TO INT subl=Integer.parseInt( Student Data[2]); sub2=Integer.parseInt( StudentData[3]); sub 3=Integer.parseInt( Student Data[4]); sub4=Integer.parseInt( Student Data [5]); // SUBJECTWISE SUMMATION Totsubl=Totsubl+subl; Totsub2=Totsub2+sub2; Totsub3=Totsub3+sub3; Totsub 4=Totsub4+sub4; Double avg= (subl + sub2+ sub3+sub) /4.0; // FIND AVERAGE FOR 4 SUBJECTS TotAvg=TotAvg+avg; WriteFileBuffer.write (data+','+avg); // WRITE STUDENT DATA WITH SUBEJCT AVERAGE TO WRITE FILE WriteFileBuffer.newLine(); // NEW LINE AFTER EACH INTEGER VALUE totStud++; // WRITE FOOTER DATA, ALL AVERAGE IN SUBJECTS AND TOTAL AVERAGE TO WRITE FILE String footer="Average, 00000,"+Totsubl/tot Stud+", "+Totsub2/totStud+", "+Totsub3/totStud+","+Totsub4/tot Stud+", "+TotAvg/totStud; WriteFileBuffer.write (footer); ReadFileBuffer.close(); // CLOSE ReadFileBuffer WriteFileBuffer.close(); // CLOSE BufferedWriter

System.out.println(" Average Grade Generated "); catch (IOException e) System.out.println(e); // IF ANY IO ERROR } // MAIN METHOD END } // END OF CLASS

SCREEN SHOT OUTPUT

cs. C:\Windows\system32\cmd.exe aman, 201601,70,30,10,20 bman, 201602,30,30,20,20 cman, 201603,30,70,30,40 dman, 201604,10,70,50,50 eman, 201605,60,60,60,90 fman, 201606,80,50,50,10 gman, 201607,10,10,80,80 hman, 201608,20,30,10,20 Average Grade Generated Press any key to continue . ... Grades - Notepad File Edit Format View Help Name, StudentNum, Java, DataStructure, Open Source, Call aman, 201601,70,30,10,20 bman, 201602,30,30,20,20 cman, 201603,30,70,30,40 dman, 201604,10,70,50,50 eman, 201605,60,60,60,90 fman, 201606,80,50,50,10 gman, 201607, 10, 10,80,80 hman, 201608,20,30,10,20 Grades_Average - Notepad File Edit Format View Help Name, StudentNum, Java, DataStructure, Open Source, Cali, Average aman, 201601,70,30,10,20,32.5 bman, 201602,30,30,20,20,25.0 cman, 201603,30,70,30,40,42.5 dman, 201604,10,70,50,50,45.0 eman, 201605,60,60,60,90,67.5 fman, 201606, 80,50,50, 10,47.5 gman, 201607,10,10,80,80,45.0 hman, 201608,20,30,10,20,20.0 Average, 00000, 38.75,43.75,38.75,41.25,40.625