Thread: I'M ABOUT TO FAIL MY CLASS... PLEASE HELPPPP!!!!

Hello,
I was given an assignment, of which I have spent the WHOLE ENTIRE DAY today AND yesterday working on. I am confused of where to start though. Here is the link to the assignment: http://my.fit.edu/~akhademzadeh2011/.../ass/ass04.pdf

Also, here is my code. Yes it is incomplete, and I don't even know where to go with it. Please help:

<import java.util.*;
 
public class PantherSolver {
 
	public static void main(String[] args) {
		Scanner kb = new Scanner(System.in);
		String input;
		String p = "0|                                      |";
		int signcontrol = 1;
 
		input = GUI(p);
		int firstnumber = inputmethod(input);
		int firstsign = sign(input,signcontrol);
		String secondp = p1(firstsign,firstnumber,p);
 
		String input2 = GUI(secondp);
	}
 
	public static String p1(int firstsign,int firstnumber, String p) {
		    if (firstsign>0) {
		    	p = "0|                                    "+ firstnumber +" |";
		    }
		    else {
		    	p = "0|                                   -"+ firstnumber +" |";
		    }
		    return p;
		}
 
	public static String GUI1(String secondp) {
		  Scanner kb = new Scanner(System.in);
		  String newinput = kb.nextLine();
		  System.out.println("   0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ");
		  System.out.println(" ========================================");
		  System.out.println(secondp);
		  System.out.println("1|--------------------------------------|");
		  System.out.println("2| OFF                          +/-  AC |");
		  System.out.println("3| 1 2 3 4 5                     ,      |");
		  System.out.println("4| 6 7 8 9 0                      SOLVE |");
		  System.out.println(" ========================================");
		  System.out.println(" Key: " + newinput +"");
 
		  return newinput;
		}
 
	public static String GUI(String p) {
	  Scanner kb = new Scanner(System.in);
 
	  System.out.println("   0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ");
	  System.out.println(" ========================================");
	  System.out.println(p);
	  System.out.println("1|--------------------------------------|");
	  System.out.println("2| OFF                          +/-  AC |");
	  System.out.println("3| 1 2 3 4 5                     ,      |");
	  System.out.println("4| 6 7 8 9 0                      SOLVE |");
	  System.out.println(" ========================================");
	  String input1=kb.nextLine();
	  System.out.println(" Key: " +  input1 +"");
 
	  return input1;
	}
 
	public static int inputmethod(String input) {
		Scanner kb = new Scanner(System.in);
		  int a = 0;
		  if (input.length()==2) {
				  if((input.charAt(0)=='0')||(input.charAt(0)=='1')) {
					 ;
				  }
				  else if((input.charAt(0)=='2') && !((input.charAt(1)==('0'))||(input.charAt(1)==('1'))||(input.charAt(1)==('2'))||(input.charAt(1)==('S'))||(input.charAt(1)==('T'))||(input.charAt(1)==('U'))||(input.charAt(1)==('V'))||(input.charAt(1)==('W'))||(input.charAt(1)==('X'))||(input.charAt(1)==('Y'))||(input.charAt(1)==('Z')))) {
				      ;
				  }
				  else if((input.charAt(0)=='3') && !((input.charAt(1)==('0'))||(input.charAt(1)==('2'))||(input.charAt(1)==('4'))||(input.charAt(1)==('6'))||(input.charAt(1)==('8'))||(input.charAt(1)==('T'))||(input.charAt(1)==('U')))) {
				  	  ;
				  }
				  else if((input.charAt(0)=='4') && !((input.charAt(1)==('0'))||(input.charAt(1)==('2'))||(input.charAt(1)==('4'))||(input.charAt(1)==('6'))||(input.charAt(1)==('8'))||(input.charAt(1)==('U'))||(input.charAt(1)==('V'))||(input.charAt(1)==('W'))||(input.charAt(1)==('X'))||(input.charAt(1)==('Y'))||(input.charAt(1)==('Z')))) {
				      ;
				  }
				  else if ((input.equals("20")) || (input.equals("21")) ||(input.equals("22")) ||(input.equals("2S")) ||(input.equals("2T")) ||(input.equals("2U")) ||(input.equals("2V")) ||(input.equals("2X")) ||(input.equals("2Y")) ||(input.equals("2Z")) ||(input.equals("30")) ||(input.equals("32")) ||(input.equals("34")) ||(input.equals("36")) ||(input.equals("38")) ||(input.equals("40")) ||(input.equals("42")) ||(input.equals("44")) ||(input.equals("46")) ||(input.equals("48")) ||(input.equals("4U")) ||(input.equals("4V")) ||(input.equals("4W")) ||(input.equals("4X")) ||(input.equals("4Y")) ||(input.equals("4Z"))) {
					  switch(input) {
					     case "20":
					     case "21":
					     case "22":
					         OFF();
					         break; 
					     case "2X":
					     case "2Y":
					     case "2Z":
					    	 main(null);
					    	 break;
					     case "30":
					         a = 1;
					         break;
					     case "32":
					         a = 2;
					         break;
					     case "34":
					         a = 3;
					         break;
					     case "36":
					         a = 4;
					         break;
					     case "38":
					         a = 5;
					         break;
					     case "40":
					         a = 6;
					         break;
					     case "42":
					         a = 7;
					         break;
					     case "44":
					         a = 8;
					         break;
					     case "46":
					         a = 9;
					         break;
					     case "48":
					         a = 0;
					         break;
					     case "4U":
					     case "4V":
					     case "4W":
					     case "4X":
					     case "4Y":
					     case "4Z":
					    	 solve();
					    	 break;
					  	}
				  	}
				  else {
					  System.out.println("Invalid key.");
					  System.out.println(" Key: " + input+"");
					  inputmethod(input);
				  }
		  		}
			else {
				System.out.println("Invalid key.");
				System.out.println(" Key: " + input +"");
				inputmethod(input);
			}
		  return a;
		}
 
	public static int sign (String input, int signcontrol) {
		int sign1 = signcontrol;
		if ((input.equals("2S")) ||(input.equals("2T")) ||(input.equals("2U")) ||(input.equals("2V"))) {
			sign1 = sign1 * -1;
		}
		else {
			sign1=1;
		}
		return sign1;
	}  
 
	public static void OFF() {
		System.exit(0);
	}
 
	public static void solve() {
 
	}
}
 
 
>

--- Update ---

I'M LOST AS A MUTHA

Please post the instructions on the forum, not everyone can open a pdf, including myself at this moment, so I have no idea what the code should do. Especially since the only problem you listed is that it is incomplete.

You have only said that it is incomplete. Where are you stuck? What does the code do now? What else should it do? We don't just fill in the blanks for you.

Ok, without the PDF, all the words are going to be jumbled up. Here's what I am talking about

CSE 1001
Project ID (for submit server purposes):
Assignment 4
ass04
Panther Solver
Deadline: Nov 14, 2012 11:59pm
The goal of this assignment is to practise control state- Sample Dialog (user inputs are underlined)
ments, strings and methods / functions. Panther Solver is a
solver that accepts exactly three comma-separated, integer-
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZonly inputs a, b and c. It solves the quadratic equation
========================================2ax + bx + c = 0 using the quadratic formula0|0 |
x=
−b ±
√
b2 − 4ac
2a
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 30
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|1 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 3u
Invalid key.
Key: 3U
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|1, |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 246
Invalid key.
Key: -146
Invalid key.
Key: 7T
Invalid key.
Key: 2T
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|1, |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 46
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|1,-9 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 2T
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|1,-9 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 3U
and displays the two solutions on the screen. If a = 0, the
equation cannot be solved. Otherwise, if b2 − 4ac ≥ 0, the
equation has two real solutions as specified by the quadratic
formula. If b2 − 4ac < 0, it has two complex solutions p + qi
√√2and p − qi where p = −b , q = 4ac−b , and i = −1.
2a2a
The solver’s keyboard consists of the digits 0-9, and +/-
for negative numbers. Pressing +/- more than once reverses
the sign. A ‘,’ key separates inputs a, b and c. Pressing SOLVE
solves the equation. AC (All-clear) clears the display, and OFF
is used to switch OFF the solver and stop the program.
The solver is organized as a 5 × 27 grid (excluding the
extremities), displayed in the sample dialog, with grid co-
ordinates labelled 0-9 and A-Z as a guide. A keypress is sim-
ulated by specifying its horizontal and vertical co-ordinates
one after another, in that order, case-sensitive. User inputs
are validated. Valid, non-functional co-ordinates on the cal-
culator result in no action.
The program first displays the solver on the screen with
the number zero and prompts the user to enter a digit. As and
when a digit is keyed in (by specifying its co-ordinates), the
digit is accumulated into a number that is displayed on the
solver. When the comma key is entered, it is displayed and
the digits taken so far form the first number (with the optional
+/-). Once a digit key is pressed, no change can be made to
its sign. (For this reason, press the +/- key and press again to
reverse it, but before keying a digit.) The process continues
for the remaining two numbers.
When SOLVE is now pressed (pressing any one letter of this
word accomplishes this task), the solver displays the two solu-
tions of the quadratic equation with a comma between them,
or the word Error. No further keys are now taken except for
AC that clears the solver and displays a zero. The solutions
can be either integers, reals, or complex numbers. Integers
solutions should be displayed without the decimal point and
without trailing zeros. Real numbers are displayed correct to
two decimal places. Complex numbers are displayed in the
form p + qi and p − qi.
Not entering exactly three integers a, b and c, or the equa-
tion not being solvable, results in Error getting displayed if
SOLVE got pressed.

0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|1,-9, |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 32
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|1,-9,2 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 48
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|1,-9,20 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 4X
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|4, 5 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 1Z
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|4, 5 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 2Z
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|0 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 48
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|0 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 3U
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|0, |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 34
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|0,3 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 3U
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|0,3, |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 2U
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|0,3, |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 30
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|0,3,-1 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 4V
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|Error |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 2Y
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|0 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 48
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|0 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 38
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|5 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 3U

0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|5, |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 3U
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|5, |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 2U
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|5, |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 33
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|5, |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 32
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|5,-2 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 3U
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|5,-2, |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 40
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|5,-2,6 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 4Z
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|0.2+1.08i, 0.2-1.08i|
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 2Z
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0|0 |
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Key: 22
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
========================================
0||
1|--------------------------------------|
2| OFF+/- AC |
3| 1 2 3 4 5,|
4| 6 7 8 9 0SOLVE |
========================================
Test your program to solve the following quadratic equa-
tions (answers given in braces):
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
x2 + 84x + 1764 = 0,
x2 + 85x + 1764 = 0,
x2 + 2x − 63 = 0,
x2 + 9x − 630 = 0,
x2 + 9x − 6300 = 0,
x2 + 2x − 63000 = 0,
3x2 − 10x + 3 = 0,
27x2 − 48x − 512 = 0,
x2 − 4x + 9 = 0,
x2 + 4x − 9 = 0,
5x2 − 17x = 0,
9x2 − 432x + 5184 = 0,
4x2 − 47x + 300 = 0,
x2 + 25 = 0,
{−42} (will show as -42, -42)
{−49, −36}
{−9, 7}
{−30, 21}
{−84, 75}
{−252, 250}
{3, 0.33}
{5.33, −3.56}
{2 + 2.24i, 2 − 2.24i}
{−5.61, 1.61}
{0, 3.40}
{24} (will show as 24, 24)
{5.88 + 6.36i, 5.88 − 6.36i}
{5i, −5i}

So here's a brief summary of the program and of my problems:
First, I'm having problems with the methods. I used a couple of methods to display the "Panther Solver" and get the input.

The assignment asks to display the "Panther Solve", then the user picks what digits he/she wants. IE "32" means 2. This is very tricky though. If the user selects the +/- sign before a digit, it changes the value that he/she is about the input to a negative. It however does NOT display the negative sign right away, but only after he/she selects the digits.

Each time you select the digit and press enter, the screen pretty much reloads itself, and in the answer key, it displays what you typed. In the "0", row, it also displays what you just selected.

If you select the +/- sign after a digit is selected, nothing will happen. If you select any valid key that does not correlate to an input, nothing should happen. Just like the quadratic equation, with a,b,c, you type in your first response (a), then input comma, then go to b, then comma, then c, then solve. Each time you input, the input is evaluated.

In the input, all letters must be capitalized, if required, or else you would return and "Invalid Key". Also, for the equation, if a=0, return "Error".

I also have to formulate a solution for imaginary numbers, using i.

I am stuck in all parts. My questions are, where do I go from here in my code. My first problem is getting the "Panther Solver" to display first, then accept the input. The next one is evaluated the negative/positive sign, and if it comes after or before the number. If it comes after, do nothing. If before, change the value to negative.

The other one is trying to make a loop for all of this in the main statement. Because for "a" in the quadratic equation, the user could want to enter "100". So I have to loop that.

Last, on the "0" row, I have to display the previous user input, just like an actual calculator. I'm having trouble getting that, and making it fit. For example, "a" starts at two spaces from the enter. Obviously as much input is entered, "a" moves to the left.

Thanks

I would say it is time to break this down into smaller parts. Pick something to implement and work on that first. If you get stuck ask a specific question about where you are stuck.

My first problem is getting the "Panther Solver" to display first,

If nothing else seems to be a prerequisite to "your first problem" then work on that first.