Thread: Help resolving these errors? Please!

Ok, so I keep on getting the errors where it says my variable may not have been initialized. I get this error in lines 22 regarding orgGrade, 26 regarding variable 'a', 33 regarding newGrade, 37 regarding newGrade and gradePercent, 41 regarding newGrade and gpoints, 45 regarding newGrade and gpercent. Any reason that is obvious that I'm missing?

import java.util.Scanner; //for the ability to get input from 
						  //the keyboard 
import java.text.DecimalFormat;
 
public class Project3
{					  
 
	public static void main(String[] args)
	{
		//enter variable below
		double orgGrade;   //Variable for the Original Grade
		double newGrade;	   //Variable for the Grade after the Curve
		double gradePercent;   //Variable for displaying the percentage from option 4.
		double points = 10.0;  //Variable for points added
		double percent = .10;   //Variable for given percentage
		double gpoints;          //Variable for the Given points
		double gpercent;         //Variable for the Given percentage
		int a;					 // Variable for Menu Selection
		Scanner keyboard = new Scanner(System.in);
		DecimalFormat df = new DecimalFormat("00.0");
		//start program here
		orginalgrade(orgGrade);  //get users grade. 
 
		clearScreen(); //clear the screen
 
		Menu(a);				//show menu/selections
 
		System.out.print(a + orgGrade); 
 
			switch (a)
			{	
				case '1':
				addPoints(newGrade, orgGrade, points);
				break;
 
				case '2':
				addPercent(newGrade, orgGrade, percent, gradePercent);
				break;
 
				case '3':
				givenPoints(newGrade, orgGrade, gpoints);
				break;
 
				case '4':
				givenPercent(newGrade, orgGrade, gpercent);
				break;
 
				case '5':
				System.out.print("That is not valid a selection!");
				break;
			}
 
 
 
 
 
 
 
 
 
 
 
	}//end main
	public static void clearScreen()
	{
		System.out.println("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
	}//end clearScreen
 
	public static void freezeScreen()
	{
		Scanner keyboard = new Scanner(System.in);
 
		System.out.print("	       -- Press Enter to Continue --");
		keyboard.nextLine();
	}//end freezeScreen
 
	public static double orginalgrade(double orgGrade)
	{
		Scanner keyboard = new Scanner(System.in);
 
 
 
		System.out.println("What is the original grade?");     //Get original grade from user
		orgGrade = keyboard.nextDouble();
 
		return orgGrade; 
	}//end orgGrade
 
	public static int Menu(int a) 
	{
 
		Scanner keyboard = new Scanner(System.in);
 
		System.out.println("	    Grade Aduster");
		System.out.println("	   by Aaron Webster ");   // Greet user
		System.out.println("******************************\n");
		System.out.println("1. Curve by 10 points.");              //menu options here
		System.out.println("2. Curve by 10 percent.");
		System.out.println("3. Curve by a certain number of points.");
		System.out.println("4. Curve by a given percentage"); 
		System.out.println("5. Exit program\n");
		System.out.println("Enter your selection here");
		a = keyboard.nextInt();
 
		return a;
	}//end Menu
 
	public static double addPoints(double newGrade, double orgGrade, double points)
	{
 
				newGrade = orgGrade + points;
				System.out.print("Curve applied: " + points);
				System.out.print("Adjusted grade: " + newGrade);
 
 
		return newGrade;
	}//end addPoints	
 
	public static double addPercent(double newGrade, double orgGrade, double percent, double gradePercent)
	{
				newGrade = (orgGrade * percent) + orgGrade; 
				gradePercent = orgGrade * percent;
				System.out.print("Curve applied: " + gradePercent);
				System.out.print("Adjusted grade: " + newGrade);
 
		return newGrade;
	}//end addPercent
 
	public static double givenPoints(double newGrade, double orgGrade, double gpoints)
	{
				Scanner keyboard = new Scanner(System.in);
 
				System.out.print("How many points should be applied to curve the grade?");
				gpoints = keyboard.nextDouble();
				newGrade = gpoints + orgGrade;
				System.out.print("Curve applied: " + gpoints);
				System.out.print("Adjusted grade: " + newGrade);
 
		return newGrade;
	}//end givenPoints
 
	public static double givenPercent(double newGrade, double orgGrade, double gpercent)
	{
				Scanner keyboard = new Scanner(System.in);
 
				System.out.print("Enter the percentage of the curve. (Ex. 10% would be .10)");
				gpercent = keyboard.nextDouble();
				newGrade = (gpercent * orgGrade) + orgGrade;
				System.out.print("Curve applied: " + gpercent);
				System.out.print("Adjusted grade: " + newGrade);
 
		return newGrade;
	}//end givenPercent
}

I tried doing that, but say I put a = 0; which a is the variable that holds the menu selection, well even when I chose a different number, 'a' still stays at 0, so how can I fix that?

Yeah, the Menu method should assign a new value to 'a', but it doesn't, 'a' stays at 0 no matter what number you enter for its new value. Same problem with my 'orgGrade" variable, the originalGrade method should assign that a new number but it keeps it at whatever number I define it at, which I've been using 0.

import java.util.Scanner; //for the ability to get input from 
						  //the keyboard 
import java.text.DecimalFormat;
 
public class Project3
{					  
 
	public static void main(String[] args)
	{
		//enter variable below
		double orgGrade = 10;   //Variable for the Original Grade
		double newGrade = 0;	   //Variable for the Grade after the Curve
		double gradePercent = 0;   //Variable for displaying the percentage from option 4.
		double points = 10.0;  //Variable for points added
		double percent = .10;   //Variable for given percentage
		double gpoints = 0;          //Variable for the Given points
		double gpercent = 0;         //Variable for the Given percentage
		int a = 0;					 // Variable for Menu Selection
		String Msg = "Press ENTER to return to the menu";
		Scanner keyboard = new Scanner(System.in);
		DecimalFormat df = new DecimalFormat("00.0");
		//start program here
 
		clearScreen();
 
		orginalgrade(orgGrade);  //get users grade. 
 
		clearScreen(); //clear the screen
 
 
		Menu(a);				//show menu/selections	
 
 
 
 
 
 
			switch (a)
			{	
				case '1':
				addPoints(newGrade, orgGrade, points, Msg);
				break;
 
				case '2':
				addPercent(newGrade, orgGrade, percent, gradePercent, Msg);
				break;
 
				case '3':
				givenPoints(newGrade, orgGrade, gpoints, Msg);
				break;
 
				case '4':
				givenPercent(newGrade, orgGrade, gpercent, Msg);
				break;
 
				case '5':
				System.out.print("That is not valid a selection!");
				break;
			}
 
 
 
 
 
 
 
 
 
 
 
	}//end main
	public static void clearScreen()
	{
		System.out.println("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
	}//end clearScreen
 
	public static void freezeScreen()
	{
		Scanner keyboard = new Scanner(System.in);
 
		System.out.print("	       -- Press Enter to Continue --");
		keyboard.nextLine();
	}//end freezeScreen
 
	public static void freezeScreen(String Msg)
	{
		Scanner keyboard = new Scanner(System.in);
 
		System.out.print(Msg);
		keyboard.nextLine();
	}//end freezeScreen
 
	public static double orginalgrade(double orgGrade)
	{
		Scanner keyboard = new Scanner(System.in);
 
 
 
		System.out.print("What is the original grade?");     //Get original grade from user
		orgGrade = keyboard.nextDouble();
 
		return orgGrade; 
	}//end orgGrade
 
	public static int Menu(int a) 
	{
 
		Scanner keyboard = new Scanner(System.in);
 
		System.out.println("	    Grade Aduster");
		System.out.println("	   by Aaron Webster ");   // Greet user
		System.out.println("******************************\n");
		System.out.println("1. Curve by 10 points.");              //menu options here
		System.out.println("2. Curve by 10 percent.");
		System.out.println("3. Curve by a certain number of points.");
		System.out.println("4. Curve by a given percentage"); 
		System.out.println("5. Exit program\n");
		System.out.print("Enter your selection here: ");
		a = keyboard.nextInt();
 
		return a;
	}//end Menu
 
	public static double addPoints(double newGrade, double orgGrade, double points, String Msg)
	{
 
				newGrade = orgGrade + points;
				System.out.print("Curve applied: " + points);
				System.out.print("Adjusted grade: " + newGrade);
				freezeScreen(Msg);
 
		return newGrade;
	}//end addPoints	
 
	public static double addPercent(double newGrade, double orgGrade, double percent, double gradePercent, String Msg)
	{
				newGrade = (orgGrade * percent) + orgGrade; 
				gradePercent = orgGrade * percent;
				System.out.print("Curve applied: " + gradePercent);
				System.out.print("Adjusted grade: " + newGrade);
				freezeScreen(Msg);
 
		return newGrade;
	}//end addPercent
 
	public static double givenPoints(double newGrade, double orgGrade, double gpoints, String Msg)
	{
				Scanner keyboard = new Scanner(System.in);
 
				System.out.print("How many points should be applied to curve the grade?");
				gpoints = keyboard.nextDouble();
				newGrade = gpoints + orgGrade;
				System.out.print("Curve applied: " + gpoints);
				System.out.print("Adjusted grade: " + newGrade);
				freezeScreen(Msg);
 
		return newGrade;
	}//end givenPoints
 
	public static double givenPercent(double newGrade, double orgGrade, double gpercent, String Msg)
	{
				Scanner keyboard = new Scanner(System.in);
 
				System.out.print("Enter the percentage of the curve. (Ex. 10% would be .10)");
				gpercent = keyboard.nextDouble();
				newGrade = (gpercent * orgGrade) + orgGrade;
				System.out.print("Curve applied: " + gpercent);
				System.out.print("Adjusted grade: " + newGrade);
				freezeScreen(Msg);
 
		return newGrade;
	}//end givenPercent
}

Reposted so you could see what I have so far.

--- Update ---

Also, I tried to assign a value of 1 to my variable 'a' so that it would atleast execute the first option in the switch statement, but it doesn't even do that, my program ends. Is my coding wrong with the switch too?

Ok, thanks so much for all your help. I just have one last question. So I have everything working now, except one thing.

import java.util.Scanner; //for the ability to get input from 
						  //the keyboard 
import java.text.DecimalFormat;
 
public class Project3
{					  
 
	public static void main(String[] args)
	{
		//enter variable below
		double orgGrade = 0;   //Variable for the Original Grade
		double newGrade = 0;	   //Variable for the Grade after the Curve
		double gradePercent = 0;   //Variable for displaying the percentage from option 4.
		double points = 10.0;  //Variable for points added
		double percent = .10;   //Variable for given percentage
		double gpoints = 0;          //Variable for the Given points
		double gpercent = 0;         //Variable for the Given percentage
		int a = 0;					 // Variable for Menu Selection
		String Msg = "Press ENTER to return to the menu";
		Scanner keyboard = new Scanner(System.in);
		DecimalFormat df = new DecimalFormat("00.0");
		//start program here
 
		clearScreen();
 
		orgGrade = orginalgrade(orgGrade);  //get users grade. 
 
		clearScreen(); //clear the screen
 
 
		a = Menu(a);				//show menu/selections	
 
 
 
 
 
 
 
			switch (a)
			{	
				case 1:
				addPoints(newGrade, orgGrade, points, Msg);
				break;
 
				case 2:
				addPercent(newGrade, orgGrade, percent, gradePercent, Msg);
				break;
 
				case 3:
				givenPoints(newGrade, orgGrade, gpoints, Msg);
				break;
 
				case 4:
				givenPercent(newGrade, orgGrade, gpercent, Msg);
				break;
 
				case 5:
				System.out.print("That is not valid a selection!");
				break;
			}
 
 
 
 
 
 
 
 
 
 
 
 
	}//end main
	public static void clearScreen()
	{
		System.out.println("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
	}//end clearScreen
 
	public static void freezeScreen()
	{
		Scanner keyboard = new Scanner(System.in);
 
		System.out.print("	       -- Press Enter to Continue --");
		keyboard.nextLine();
	}//end freezeScreen
 
	public static void freezeScreen(String Msg, int a)
	{
		Scanner keyboard = new Scanner(System.in);
 
		System.out.print(Msg);
		keyboard.nextLine();
		Menu();
	}//end freezeScreen
 
	public static double orginalgrade(double orgGrade)
	{
		Scanner keyboard = new Scanner(System.in);
 
 
 
		System.out.print("What is the original grade?");     //Get original grade from user
		orgGrade = keyboard.nextDouble();
 
		return orgGrade; 
	}//end orgGrade
 
	public static int Menu(int a) 
	{
 
		Scanner keyboard = new Scanner(System.in);
 
		System.out.println("	    Grade Aduster");
		System.out.println("	   by Aaron Webster ");   // Greet user
		System.out.println("******************************\n");
		System.out.println("1. Curve by 10 points.");              //menu options here
		System.out.println("2. Curve by 10 percent.");
		System.out.println("3. Curve by a certain number of points.");
		System.out.println("4. Curve by a given percentage"); 
		System.out.println("5. Exit program\n");
		System.out.print("Enter your selection here: ");
		a = keyboard.nextInt();
 
		if (a > 5 || a < 1)
		{
			System.out.print("That is not a valid option!\n\n");
		}
		freezeScreen(Msg);
		return a;
	}//end Menu
 
	public static double addPoints(double newGrade, double orgGrade, double points, String Msg)
	{
 
				newGrade = orgGrade + points;
				System.out.println("Curve applied: " + points);
				System.out.println("Adjusted grade: " + newGrade);
				freezeScreen(Msg);
 
		return newGrade;
	}//end addPoints	
 
	public static double addPercent(double newGrade, double orgGrade, double percent, double gradePercent, String Msg)
	{
				newGrade = (orgGrade * percent) + orgGrade; 
				gradePercent = orgGrade * percent;
				System.out.println("Curve applied: " + gradePercent);
				System.out.println("Adjusted grade: " + newGrade);
				freezeScreen(Msg);
 
		return newGrade;
	}//end addPercent
 
	public static double givenPoints(double newGrade, double orgGrade, double gpoints, String Msg)
	{
				Scanner keyboard = new Scanner(System.in);
 
				System.out.println("How many points should be applied to curve the grade?");
				gpoints = keyboard.nextDouble();
				newGrade = gpoints + orgGrade;
				if (newGrade > 100)
				{
					newGrade = 100;
				}
				System.out.println("Curve applied: " + gpoints);
				System.out.println("Adjusted grade: " + newGrade);
				freezeScreen(Msg);
 
		return newGrade;
	}//end givenPoints
 
	public static double givenPercent(double newGrade, double orgGrade, double gpercent, String Msg)
	{
				Scanner keyboard = new Scanner(System.in);
 
				System.out.println("Enter the percentage of the curve. (Ex. 10% would be .10)");
				gpercent = keyboard.nextDouble();
				newGrade = (gpercent * orgGrade) + orgGrade;
				System.out.println("Curve applied: " + gpercent);
				System.out.println("Adjusted grade: " + newGrade);
				freezeScreen(Msg);
 
		return newGrade;
	}//end givenPercent
}

In my freezeScreen(String Msg) method, I need to call my Menu method inside of it. But I'm not sure how that works, so I guess my question is how to call a method from a method? Thanks

public static void freezeScreen(String Msg, int a)
	{
		Scanner keyboard = new Scanner(System.in);
 
		System.out.print(Msg);
		keyboard.nextLine();
		Menu();
	}//end freezeScreen

I need to call my Menu method from my freezeScreen(String Msg) method.

Scroll down near the end is where my question lies.

import java.util.Scanner; //for the ability to get input from 
						  //the keyboard 
import java.text.DecimalFormat;
 
public class Project3
{					  
 
	public static void main(String[] args)
	{
		//enter variable below
		double orgGrade = 0;   //Variable for the Original Grade
		double newGrade = 0;	   //Variable for the Grade after the Curve
		double gradePercent = 0;   //Variable for displaying the percentage from option 4.
		double points = 10.0;  //Variable for points added
		double percent = .10;   //Variable for given percentage
		double gpoints = 0;          //Variable for the Given points
		double gpercent = 0;         //Variable for the Given percentage
		int a = 0;					 // Variable for Menu Selection
		String Msg = "Press ENTER to return to the menu";
		Scanner keyboard = new Scanner(System.in);
		DecimalFormat df = new DecimalFormat("00.0");
		//start program here
 
		clearScreen();
 
		orgGrade = orginalgrade(orgGrade);  //get users grade. 
 
		clearScreen(); //clear the screen
 
 
		a = enu(a);				//show menu/selections	
 
 
 
 
 
 
 
			switch (a)
			{	
				case 1:
				addPoints(newGrade, orgGrade, points, Msg);
				break;
 
				case 2:
				addPercent(newGrade, orgGrade, percent, gradePercent, Msg);
				break;
 
				case 3:
				givenPoints(newGrade, orgGrade, gpoints, Msg);
				break;
 
				case 4:
				givenPercent(newGrade, orgGrade, gpercent, Msg);
				break;
 
				case 5:
				System.out.print("That is not valid a selection!");
				break;
			}
 
 
 
 
 
 
 
 
 
 
 
 
	}//end main
	public static void clearScreen()
	{
		System.out.println("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
	}//end clearScreen
 
	public static void freezeScreen()
	{
		Scanner keyboard = new Scanner(System.in);
 
		System.out.print("	       -- Press Enter to Continue --");
		keyboard.nextLine();
	}//end freezeScreen
 
	public static void freezeScreen(String Msg, int a)
	{
		Scanner keyboard = new Scanner(System.in);
 
		System.out.print(Msg);
		keyboard.nextLine();
		[B]I NEED TO CALL MY MENU METHOD FROM THIS METHOD[/B]
	}//end freezeScreen
 
	public static double orginalgrade(double orgGrade)
	{
		Scanner keyboard = new Scanner(System.in);
 
 
 
		System.out.print("What is the original grade?");     //Get original grade from user
		orgGrade = keyboard.nextDouble();
 
		return orgGrade; 
	}//end orgGrade
 
	public static int menu(int a) 
	{
 
		Scanner keyboard = new Scanner(System.in);
 
		System.out.println("	    Grade Aduster");
		System.out.println("	   by Aaron Webster ");   // Greet user
		System.out.println("******************************\n");
		System.out.println("1. Curve by 10 points.");              //menu options here
		System.out.println("2. Curve by 10 percent.");
		System.out.println("3. Curve by a certain number of points.");
		System.out.println("4. Curve by a given percentage"); 
		System.out.println("5. Exit program\n");
		System.out.print("Enter your selection here: ");
		a = keyboard.nextInt();
 
		if (a > 5 || a < 1)
		{
			System.out.print("That is not a valid option!\n\n");
		}
		freezeScreen(Msg);
		return a;
	}//end Menu
 
	public static double addPoints(double newGrade, double orgGrade, double points, String Msg)
	{
 
				newGrade = orgGrade + points;
				System.out.println("Curve applied: " + points);
				System.out.println("Adjusted grade: " + newGrade);
				freezeScreen(Msg);
 
		return newGrade;
	}//end addPoints	
 
	public static double addPercent(double newGrade, double orgGrade, double percent, double gradePercent, String Msg)
	{
				newGrade = (orgGrade * percent) + orgGrade; 
				gradePercent = orgGrade * percent;
				System.out.println("Curve applied: " + gradePercent);
				System.out.println("Adjusted grade: " + newGrade);
				freezeScreen(Msg);
 
		return newGrade;
	}//end addPercent
 
	public static double givenPoints(double newGrade, double orgGrade, double gpoints, String Msg)
	{
				Scanner keyboard = new Scanner(System.in);
 
				System.out.println("How many points should be applied to curve the grade?");
				gpoints = keyboard.nextDouble();
				newGrade = gpoints + orgGrade;
				if (newGrade > 100)
				{
					newGrade = 100;
				}
				System.out.println("Curve applied: " + gpoints);
				System.out.println("Adjusted grade: " + newGrade);
				freezeScreen(Msg);
 
		return newGrade;
	}//end givenPoints
 
	public static double givenPercent(double newGrade, double orgGrade, double gpercent, String Msg)
	{
				Scanner keyboard = new Scanner(System.in);
 
				System.out.println("Enter the percentage of the curve. (Ex. 10% would be .10)");
				gpercent = keyboard.nextDouble();
				newGrade = (gpercent * orgGrade) + orgGrade;
				System.out.println("Curve applied: " + gpercent);
				System.out.println("Adjusted grade: " + newGrade);
				freezeScreen(Msg);
 
		return newGrade;
	}//end givenPercent
}

--- Update ---

I put my question in all CAPS inside the code, near the bottom. In the freezeScreen(String Msg) method

I don't know how to do that.. So I'll just restate my question again.

So my freezeScreen(String Msg) method on line 87

public static void freezeScreen(String Msg,)
	{
		Scanner keyboard = new Scanner(System.in);
 
		System.out.print(Msg);
		keyboard.nextLine();
 
	}//end freezeScreen

I need to call this Method from the method listed above.

{
 
		Scanner keyboard = new Scanner(System.in);
 
		System.out.println("	    Grade Aduster");
		System.out.println("	   by Aaron Webster ");   // Greet user
		System.out.println("******************************\n");
		System.out.println("1. Curve by 10 points.");              //menu options here
		System.out.println("2. Curve by 10 percent.");
		System.out.println("3. Curve by a certain number of points.");
		System.out.println("4. Curve by a given percentage"); 
		System.out.println("5. Exit program\n");
		System.out.print("Enter your selection here: ");
		a = keyboard.nextInt();
 
		if (a > 5 || a < 1)
		{
			System.out.print("That is not a valid option!\n\n");
		}
		freezeScreen(Msg);
		return a;
	}//end Menu

So, basically whenever i call my freezeScreen(Msg), I need the menu() to come with it.

It's the 1st code in #13. Ok, so In the Menu Method, the user can select 1 -5, but if the user makes in invalid selection such as 6, it will say "That is an invalid selection!", then the freezeScreen(String Msg) is called, which will say "Press ENTER to return to the Menu". Which is why I need the Menu Method to be called with the freezeScreen(String Msg). I would just put the Menu Method after each freezeScreen(String Msg), but my Professor doesn't want us to do that.

So I need my code to look like

public static void freezeScreen(String Msg,)
	{
		Scanner keyboard = new Scanner(System.in);
 
		System.out.print(Msg);
		keyboard.nextLine();
                Menu();
 
	}//end freezeScreen

So that my menu pops up after each freezeScreen

Well, my variable 'a' is being defined in the Menu() method, but the only valid options are 1-5, so if anything else is put into variable 'a', the freezeScreen() is called which says "That is not a Valid Selection" which then says "Press ENTER to go back to the Menu". So then the Menu() should be called, and the variable 'a' can be reset. Right now I have my program working except whenever I enter an invalid selection, the freezeScreen() is called, but I can't get the Menu() to reappear too.