I remember some mods we had installed on the old Omnimaga boards were just replacing some code, CSS properties and words using javascript. It was a strange way to do it but it kinda did the job. I guess it was inevitable since Invisionfree did not let us install PHP mods.

nice, yeong!


next java mini-project i'm working on: linear equation solver (via rref).
done. here's the code, it's fairly obfuscated.... so good luck if you want to understand it.

import java.util.Scanner;

public class Solve{
static double[][] matrix;
public static void main(String[] args){
Scanner reader = new Scanner(System.in);
System.out.print("# of variables: ");
int vars = reader.nextInt();
inputValues(vars,vars+1);
for(int col = 0; col < vars; col++){
for(int row = 0; row < vars; row++){
if(row==0)
matrix[col] = rowDiv(matrix[col],matrix[col][col]);
if(row!=col)
matrix[row] = rowAdd(rowDiv(matrix[col],-1/matrix[row][col]),matrix[row]);

}
}
for(int i = 0; i < vars; i++)
System.out.println("xyzuvw".substring(i,i+1) + "= " + Math.round(matrix[i][vars]*1000)/1000.0);

}

public static void inputValues(int rows, int columns){
String equ = "Ax+By+Cz+Du+Ev+Fw".substring(0,rows*3-1) + "=" + "ABCDEFG".substring(rows,rows+1);
matrix = new double[rows][columns];
Scanner reader = new Scanner(System.in);
for(int r = 0; r < rows; r++){
System.out.println("Enter equation " + (r+1) + ": \n" + equ);
for(int c = 0; c < columns; c++){//C++
System.out.print("ABCDEFG".substring(c,c+1)+"= ");
matrix[r][c] = reader.nextInt();
}
System.out.println();
}
}

public static double[] rowDiv(double[] r, double c ){
double[] temp = new double[r.length];
for(int p = 0; p < r.length; p++)
temp[p] = r[p] / c;
return temp;
}

public static double[] rowAdd(double[] i, double[] j){
double[] temp = new double[i.length];
for(int p = 0; p < i.length; p++)
temp[p] = i[p] + j[p];
return temp;
}
}

it can take up to 6 variables, but as far as i know if i modified it a little, it could take an infinite number. it returns numbers to the thousandth decimal place. oh, and it will not tell you if there are no solutions/infinite solutions. it will likely do one of the following things in either of these scenarios:
-tell you that all the variables are 0.
-tell you that all the variables are NaN (not a number)
-tell you that all the variables are either -Infinity or Infinity.

@nemo: I remember we had to do the linear equation solver 7 weeks ago in APCS.
Looks good! Yours have more feature.

Port Reuben Quest 1 and 2 to java!

I don't even know how to put graphic on java...
 

I don't even know how to put graphic on java...
 

do you want an example program? it isn't too difficult, i could make an overly-commented program where you move a ball around with the arrow keys if you want.

by the way, what IDE do you program in?

I don't even know how to put graphic on java...
 

Me too.
I'd appreciate the example as well.

I'm using BlueJ too, but that's because what my AP Comp Sci class has to use. It really annoys me at times, though it's much less annoying since I figured out the keyboard shortcut for auto-indenting your class.

i'm in APCS as well, i use JCreator Lite. my teacher got the free version before it started costing money.
i'll have some code up in a sec. do you guys know what a JFrame or JPanel are or should i comment the basic elements too?