I think you want something like this. The formatting is off, but it should give the essential information you want.
import java.util.Scanner;
public class BookstoreCredit
{
public static void computeDiscount(String name, double gpa)
{
double credits;
credits = gpa * 10;
System.out.println(name + " your GPA is " +
gpa + " so your credit is $" + credits);
}
public static void main (String args[])
{
String studentName;
double gradeAverage;
Scanner inputDevice = new Scanner(System.in);
System.out.println("Enter Student name: ");
studentName = inputDevice.nextLine();
System.out.println("Enter student GPA: ");
gradeAverage = inputDevice.nextDouble();
computeDiscount(studentName, gradeAverage);
}
}