Thread: INPUTMISMATCHEXCEPTION

Hi, Give me that studentGPA.txt file..then only I can check what happend

The InputMismatchException is usually thrown because you are trying to use a method on the Scanner object which returns a specific type such as nextDouble() but when the next token isn't a double it throws the exception at you.

You can always check what the next token is before trying to grab it using Scanner.hasNextDouble().

See Scanner (Java Platform SE 6))

// Json

hey, jassi here is the text file :

M 3.50
M 4.31
F 3.46
M 2.98
F 4.10
M 3.10
F 4.23
M 2.99
F 3.65
F 2.53

Well jassi the requirement is this:
You receve a file that contains female and male student's GPA for certain courses .Due to confidentility, only the letter code f is used to represent female students; m is used to repesent male students.Every file entry consists of a letter code followed by a GPA .Each line has one entry The number of entries that may be in a file is unknown. Write a program that computes and outputs the average GPA for both female and male students Format your results to two decimal places.

Well I have made some changes to my program.But i still have this error:

[
import java.util.*;
import java.io.*;

public class university
{
public static void main(String[] args)throws FileNotFoundException

{

double GPA ;
double sum = 0;
String Mcode ;
String Fcode ;


Scanner inFile = new Scanner(new FileReader("studentGPA.txt"));
PrintWriter outFile = new PrintWriter("studentGPAavg.out");


Mcode = inFile.next();
Fcode = inFile.next();



outFile.println("Enter code:" + Mcode + " " + Fcode );


outFile.print("Students GPA is:" );

GPA = inFile.nextDouble();
outFile.printf(" %5.2f", GPA);
sum = sum + GPA;

GPA = inFile.nextDouble();
outFile.printf(" %5.2f", GPA);
sum = sum + GPA;

GPA = inFile.nextDouble();
outFile.printf(" %5.2f", GPA);
sum = sum + GPA;

GPA = inFile.nextDouble();
outFile.printf(" %5.2f", GPA);
sum = sum + GPA;

GPA = inFile.nextDouble();
outFile.printf(" %5.2f", GPA);
sum = sum + GPA;


GPA = inFile.nextDouble();
outFile.printf(" %5.2f", GPA);
sum = sum + GPA;


GPA = inFile.nextDouble();
outFile.printf(" %5.2f", GPA);
sum = sum + GPA;

GPA = inFile.nextDouble();
outFile.printf(" %5.2f", GPA);
sum = sum + GPA;

GPA = inFile.nextDouble();
outFile.printf(" %5.2f", GPA);
sum = sum + GPA;

GPA = inFile.nextDouble();
outFile.printf(" %5.2f", GPA);
sum = sum + GPA;

outFile.println();

outFile.printf("The average of the GPA is: %5.2f %n ", sum/10.0);

inFile.close();
outFile.close();
}
}
/]

here is the error:

C:\TEMP>java university
Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:817)
at java.util.Scanner.next(Scanner.java:1431)
at java.util.Scanner.nextDouble(Scanner.java:2335)
at university.main(university.java:64)

Resolved Program without errors.After running your program

You can check studentGPavg.out

import java.util.*;
import java.io.*;

public class university
{
public static void main(String[] args)throws FileNotFoundException

{

double GPA ;
double sum = 0;
String gender ;
float counter=0;


Scanner inFile = new Scanner(new FileReader("studentGPA.txt"));
PrintWriter outFile = new PrintWriter("studentGPAavg.out");

outFile.println("Code: M F");
outFile.println("Students GPA is:" );

while(inFile.hasNext()){

gender=inFile.next();
if(gender.equalsIgnoreCase("M")){
GPA = inFile.nextDouble();
outFile.printf(" %5.2f", GPA);
sum = sum + GPA;
counter++;
}else if(gender.equalsIgnoreCase("F")){
GPA = inFile.nextDouble();
outFile.printf(" %5.2f", GPA);
sum = sum + GPA;
counter++;
}

}

outFile.println();
outFile.printf("The average of the GPA is: %5.2f %n ", sum/counter);
inFile.close();
outFile.close();
}
}

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