Thread: what is wrong with my code? need help

yea i have to make a grade calculator that when i run the program it asks me standard questions and i type them into the box and it shows in the bottom (using eclipse btw). So i type stuff in 1 by 1 and basically when i go through it several times its suppose to calculate my gpa but my codes all wrong and stuff. heres what my code says. anyone can help me out or send some insight?


import javax.swing.JOptionPane;


public class proj22
{
public static void main(String args[]) {
PrintExplanation();
name=name();
semesterValue=semesterValue();
courseName=courseName();
courseGrade = courseGrade();
GetValidNumberInput(courseName, credits, GPA);
GPA=CalculateGPA(credits, gradeNumber);


}



private static String name() {
// TODO Auto-generated method stub
return null;
}



private static String courseName() {
// TODO Auto-generated method stub
return null;
}



private static String courseGrade() {
// TODO Auto-generated method stub
return null;
}



private static String semesterValue() {
// TODO Auto-generated method stub
return null;
}

int lowerNum=1;
int upperNum=4;


static int gradeNumber,credits, GPA, semester;
static String name, creditsValue, semesterValue, courseName, courseGrade, prompt_user;
int totalCredits = 0;
int totalQualityPoints= 0;


//This explains what the program does and shows it to the person who is running it.
public static void PrintExplanation(){

JOptionPane.showMessageDialog(null, "This allows you to calculate your GPA for the semster you are/were in by entering the number/letter of your grades).");
}









public static void GetValidNumberInput(String promptStr, int lowerNum, int upperNum){


String name;
name= JOptionPane.showInputDialog("Hello, What is your name?");
System.out.println( "showInputDialog: " + name);

String semesterValue;
semesterValue = JOptionPane.showInputDialog("What semester are you in?");
System.out.println( "showInputDialog: " + semesterValue);



do {



String courseName;
courseName = JOptionPane.showInputDialog("What is the course name? \n or type 'end' if no courses left");

if(courseName.equals("end")) break;
System.out.println( "showInputDialog: " + courseName);

String courseGrade;
courseGrade= JOptionPane.showInputDialog("What did you make in this class?");
System.out.println( "showInputDialog: " + courseGrade);

String creditsValue;
creditsValue = JOptionPane.showInputDialog("How many hours was this class?");

if(credits < lowerNum || credits > upperNum){
JOptionPane.showMessageDialog(null,"That is not a valid number.");
} else {
credits += Integer.parseInt(creditsValue);
}


}while(!courseName.equals("end"));



}




public static void GenerateGPAReport ( int totalCredits, int totalQualityPoints){
//This shows what the GPA is
JOptionPane.showMessageDialog(null,"Grading Period:"+semester+ "\n Total Credits Taken :"+totalCredits+ "\n Total Quality Points:"+totalQualityPoints+"\n GPA:"+GPA);
}

public static int CalculateGPA (int totalCredits, int totalQualityPoints){
//Calculates the GPA

totalQualityPoints = credits * gradeNumber;
GPA = totalQualityPoints / totalCredits;
return GPA;
}

public static int ConvertGradeToPoints(String grade){
//This converts the grades inputed to a number (i.e. A = 4, B=3, C=2, ect)
;

if (grade.equalsIgnoreCase("A")){ gradeNumber = 4;
}
else

if
(grade.equalsIgnoreCase("B")){
gradeNumber = 3;
}

else

if
(grade.equalsIgnoreCase("C")) { gradeNumber = 2;
}
else

if
(grade.equalsIgnoreCase("D")){
gradeNumber = 1;
}

else
{
gradeNumber = 0;
}
return
gradeNumber;

}
}

here it is

import javax.swing.JOptionPane;


public class proj22
{
public static void main(String args[]) {
PrintExplanation();
name=name();
semesterValue=semesterValue();
courseName=courseName();
courseGrade = courseGrade();
GetValidNumberInput(courseName, credits, GPA);
GPA=CalculateGPA(credits, gradeNumber);


}



private static String name() {
// TODO Auto-generated method stub
return null;
}



private static String courseName() {
// TODO Auto-generated method stub
return null;
}



private static String courseGrade() {
// TODO Auto-generated method stub
return null;
}



private static String semesterValue() {
// TODO Auto-generated method stub
return null;
}

int lowerNum=1;
int upperNum=4;


static int gradeNumber,credits, GPA, semester;
static String name, creditsValue, semesterValue, courseName, courseGrade, prompt_user;
int totalCredits = 0;
int totalQualityPoints= 0;


//This explains what the program does and shows it to the person who is running it.
public static void PrintExplanation(){

JOptionPane.showMessageDialog(null, "This allows you to calculate your GPA for the semster you are/were in by entering the number/letter of your grades).");
}









public static void GetValidNumberInput(String promptStr, int lowerNum, int upperNum){


String name;
name= JOptionPane.showInputDialog("Hello, What is your name?");
System.out.println( "showInputDialog: " + name);

String semesterValue;
semesterValue = JOptionPane.showInputDialog("What semester are you in?");
System.out.println( "showInputDialog: " + semesterValue);



do {



String courseName;
courseName = JOptionPane.showInputDialog("What is the course name? \n or type 'end' if no courses left");

if(courseName.equals("end")) break;
System.out.println( "showInputDialog: " + courseName);

String courseGrade;
courseGrade= JOptionPane.showInputDialog("What did you make in this class?");
System.out.println( "showInputDialog: " + courseGrade);

String creditsValue;
creditsValue = JOptionPane.showInputDialog("How many hours was this class?");

if(credits < lowerNum || credits > upperNum){
JOptionPane.showMessageDialog(null,"That is not a valid number.");
} else {
credits += Integer.parseInt(creditsValue);
}


}while(!courseName.equals("end"));



}




public static void GenerateGPAReport ( int totalCredits, int totalQualityPoints){
//This shows what the GPA is
JOptionPane.showMessageDialog(null,"Grading Period:"+semester+ "\n Total Credits Taken :"+totalCredits+ "\n Total Quality Points:"+totalQualityPoints+"\n GPA:"+GPA);
}

public static int CalculateGPA (int totalCredits, int totalQualityPoints){
//Calculates the GPA

totalQualityPoints = credits * gradeNumber;
GPA = totalQualityPoints / totalCredits;
return GPA;
}

public static int ConvertGradeToPoints(String grade){
//This converts the grades inputed to a number (i.e. A = 4, B=3, C=2, ect)
;

if (grade.equalsIgnoreCase("A")){ gradeNumber = 4;
}
else

if
(grade.equalsIgnoreCase("B")){
gradeNumber = 3;
}

else

if
(grade.equalsIgnoreCase("C")) { gradeNumber = 2;
}
else

if
(grade.equalsIgnoreCase("D")){
gradeNumber = 1;
}

else
{
gradeNumber = 0;
}
return
gradeNumber;

}
}

Originally Posted by balmung123

yea i have to make a grade calculator that when i run the program it asks me standard questions and i type them into the box and it shows in the bottom (using eclipse btw). So i type stuff in 1 by 1 and basically when i go through it several times its suppose to calculate my gpa but my codes all wrong and stuff. heres what my code says. anyone can help me out or send some insight?

Hello balmung123!
Can you elaborate what's wrong with your code (errors, exceptions, unexpected behaviour)?
And please edit your post and use the code tags to format it.