Issue
Output Error : Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - illegal start of expression
I'm creating a class that calculate 1 student that take 3 quizzes 25%, 1 Midterm 25% , and 1 Final 50%
package Grading;
import java.util.Scanner;
public class Grading {
public static void main(String[] args) {
Scanner input =new Scanner(System.in);
public static double quiz1, quiz2, quiz3, midterm, finalExam, Grades, totalGrade, bothQuizzes, PfinalExam, PmidTerm;
public static String studentname;
public static int Score;
public String getstudentname( )
{
return studentname;
}
public double getquiz1()
{
return quiz1;
}
public double getquiz2 ()
{
return quiz2;
}
public double getquiz3 ()
{
return quiz3;
}
public double midterm()
{
return midterm;
}
public double finalExam()
{
return finalExam;
}
public void setquiz1 (double quiz1)
{
this.quiz1 = quiz1;
}
public void setquiz2 (double quiz2)
{
this.quiz2 = quiz2;
}
public void setquiz3 (double quiz3)
{
this.quiz3 = quiz3;
}
public void setmidterm()
{
this.midterm = midterm;
}
public void setfinalExam()
{
this.finalExam = finalExam;
}
public void setGrades ()
{
}
public String toString(){
return this.quiz1 + " " + this.quiz2 + this.quiz3 + " " + this.midterm + " " + this.finalExam;
}
public static void readInput(){
System.out.println("Please enter the grade you got for the first quiz: ");
quiz1 = grades.nextInt();
while (quiz1 <0 || quiz1>10)
{
System.out.println("Please enter a grade between zero and ten: ");
quiz1 = grades.nextInt();
}
System.out.println("Please enter the grade you got for the second quiz: ");
quiz2 = grades.nextInt();
while (quiz2 <0 || quiz2>10)
{
System.out.println("Please enter a grade between zero and ten: ");
quiz2 = grades.nextInt();
}
System.out.println("Please enter the grade you got for the third quiz: ");
quiz3 = grades.nextInt();
while (quiz3 <0 || quiz3>10)
{
System.out.println("Please enter a grade between zero and ten: ");
quiz3 = grades.nextInt();
}
System.out.println("Please enter the grade you got on your midterm: ");
midterm = grades.nextInt();
while (midterm <0 || midterm>100)
{
System.out.println("Please enter a grade between 0 and 100: ");
midterm = grades.nextInt();
}
System.out.println("Please enter the grade you got on your final exam: ");
finalExam = grades.nextInt();
while (finalExam < 0 || finalExam > 100)
{
System.out.println("Please enter a grade between 0 and 100: ");
finalExam = grades.nextInt();
}
}
public static void output()
{
System.out.println(" your score for the first quiz was " + quiz1 );
System.out.println("your score for the second quiz was " + quiz2);
System.out.println("your score for the third quiz was " + quiz3);
System.out.println(" your score for the midterm was " + midterm );
System.out.println("your score for the final exam was " + finalExam);
bothQuizzes = ((quiz1 + quiz2 + quiz3)/100)*.25;
PmidTerm = (midterm/100) *.35;
PfinalExam = (finalExam/100) * .40;
System.out.println("Your total grade for these grades is " + totalGrade + "%");
System.out.println("Your total grade for these grades is " + totalGrade);
double letterGrade = totalGrade;
if (letterGrade >= 90)
{
System.out.println("Your grade is an A");
// grade = "A";
}
else if (letterGrade >= 80)
{
System.out.println("Your grade is a B");
}
else if (letterGrade >= 70)
{
System.out.println("Your grade is a C");
}
else if (letterGrade >= 60)
{
System.out.println("Your grade is a D");
}
else
{
System.out.println("Your grade is an F");
}
}}
Solution
I have re-written your program. I hope that this is what you wanted to achieve. I didn't know how you wanted to count the grade, so I've marked the place where you can change that code with a comment.
Since there were some major problems in your code with field declaration and function bodies, I've reorganized them. You can take a look at this code:
import java.util.Scanner;
public class Grading {
private int quiz1, quiz2, quiz3, midterm, finalExam; //quizzes exams tests what grades
public void readInput () {
Scanner in = new Scanner(System.in);
System.out.print("Please enter the grade you got for the first quiz: ");
quiz1 = readInt(in, 0, 10);
System.out.print("Please enter the grade you got for the second quiz: ");
quiz2 = readInt(in, 0, 10);
System.out.print("Please enter the grade you got for the third quiz: ");
quiz3 = readInt(in, 0, 10);
System.out.print("Please enter the grade you got on your midterm: ");
midterm = readInt(in, 0, 100);
System.out.print("Please enter the grade you got on your final exam: ");
finalExam = readInt(in, 0, 100);
}
public void output () {
System.out.println("Your score for the first quiz was " + quiz1);
System.out.println("Your score for the second quiz was " + quiz2);
System.out.println("Your score for the third quiz was " + quiz3);
System.out.println("Your score for the midterm was " + midterm);
System.out.println("Your score for the final exam was " + finalExam);
//dunno if this is the way you want to count it; change as needed
double quizzes = (quiz1 + quiz2 + quiz3) / 100 * 0.25;
double Pmidterm = midterm / 100 * 0.25;
double PfinalExam = finalExam /100 * 0.50;
double totalGrade = (quizzes + Pmidterm + PfinalExam) * 100.0;
char grade;
if (totalGrade >= 90)
grade = 'A';
else if (totalGrade >= 80)
grade = 'B';
else if (totalGrade >= 70)
grade = 'C';
else if (totalGrade >= 60)
grade = 'D';
else grade = 'F';
System.out.printf("Your grade is %c\n", grade);
}
private int readInt (Scanner in, int min, int max) {
int value = in.nextInt();
if (value < min || value > max) {
System.out.printf("Please enter a grade between %d and %d: ", min, max);
return readInt(in, min, max);
}
return value;
}
public static void main(String[] args) {
Grading grading = new Grading();
grading.readInput();
grading.output();
}
}
Answered By - vip1all