kaisen adina

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Recent posts by kaisen adina

need help about combinations

Campbell Ritchie wrote:Are you supposed to calculate how many combinations there are, or print them all out?

i'm finished at calculating the combinations there are

but the problem sir is that

when the total combinations entered by the user is <=10

it will print all the 10 combinations of the items or objects entered by the user...

the hard part is that is the "number of takes at a time"

for example if the user input 2 as a number of takes at a time it should print only 2 colums
if the user input 3 as a number of takes it should look like as the example above...
and so on...

11 years ago

Beginning Java

need help about combinations

im making a program that will show the number of possible combination of
what the user inputs and number of takes at a time...
i already finished making showing the number of possible combination but
i am having problem in showing the actual items of combination of the inputted...
to make it more easy to understand...

for example

the user input " apple banana cherry mango orange"
number of takes at a time: " 3 "

the output will show the formula and computation and the total number of combinations:
for example the answer is " 10 "

now here comes the problem.

i need to show the possible combinations of the items if the total combinations is less or equal to 10

apple banana cherry mango orange by taking 3 at a time

example

apple banana cherry
apple banana mango
apple banana orange
apple cherry mango
apple cherry orange
apple mango orange
banana cherry mango
banana cherry orange
banana mango orange
cherry mango orange

import javax.swing.*;
import java.util.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class testing {
int a,b, r, c, fact1 = 1, fact2= 1, fact3=1;
int n = 0;
String array[]= new String [100];
public void gui(){
//Creating the Frame
JFrame frame = new JFrame("Counting - Combination");
frame.setLocation(400, 250);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400,400);
//Creating the Text Area and adding components
JTextArea text = new JTextArea(6, 20);
text.setText("\n\n A Program that shows an Example of \n\n"
+ " Counting : Combination \n\n"
+ "Formula for Combination: \n\n C(n,r)= n! / r! (n-r)! \n\n"
+ " Where n is the total set of items \n"
+ " Where r is the items being chosen from a set");
text.setEditable(false);
text.setCursor(null);
text.setFocusable(false);
text.setBackground(Color.black);
text.setForeground(Color.white);
text.setFont(new Font("Arial Narrow",Font.BOLD,15));
//Creating the Button and adding the components
JButton Cancel = new JButton("EXIT THE PROGRAM");
Cancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null, " Thank You! " +
"");
System.exit(0); }
});
JButton Start = new JButton("CLICK TO START THE PROGRAM!");
Start.setPreferredSize(new Dimension(100, 100));
Start.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
testing aw2 = new testing();
aw2.combin();
aw2.formula();
JOptionPane.showConfirmDialog(null,"TAPOS NA", "Masaya", JOptionPane.YES_NO_CANCEL_OPTION);
System.exit(0);
}
});
//Adding Components to the frame.
frame.add(Cancel,BorderLayout.SOUTH);
frame.add(Start,BorderLayout.NORTH);
frame.add( text,BorderLayout.CENTER);
frame.setVisible(true);
}
public void combin(){
String input = JOptionPane.showInputDialog("Input all the items below: ");
StringTokenizer st = new StringTokenizer (input);
while (st.hasMoreTokens()){
array [n] = st.nextToken();
n = n + 1;
}
JOptionPane.showMessageDialog(null, "You entered the items: \n\n = " +input+
"\n\nThe number of items entered: \n\n = " +n);
String input1 = JOptionPane.showInputDialog("Input How Many takes at a time?");
r = Integer.parseInt(input1);
}
public void formula() {
c= n-r;
for (a = 1; a <= n; a++ ){
fact1 = fact1 * a;
}
for (a = 1; a <= r; a++ ){
fact2 = fact2 * a;
}
for (a = 1; a <= c; a++){
fact3 = fact3 * a;
}
b= fact1 / (fact2 * fact3);
JOptionPane.showMessageDialog(null,
"Therefore \n\nC(" +n+ "," +r+ ") = " +n+"! / " +r+ "! ("
+n+ "-" +r+ ")! \n\n=" +fact1+ " / " +fact2+ "("
+fact3+ ")\n\n= " +b+ " combinations");
if (b<=10){
JOptionPane.showMessageDialog(null,"Oops!, The Combinations are below 10!!");
// the problem starts here
// i need to print all the possible combinations if it is <=10//
// 7 days of trying but cant get it...//
}
}
public static void main (String[] args){
testing aw2 = new testing();
aw2.gui();
}}

thank you in advance guys

11 years ago

Beginning Java