Java Math Tutor.

tag:blogger.com,1999:blog-18646242.post-1131127186021749142005-11-04T09:24:00.000-08:002005-11-04T09:59:46.050-08:00Java Math Tutor.<sums i=""><sums i=""><sums i=""><sums i=""><sums i=""><sums i=""><sums i=""><sums i=""><sums i=""><sums i=""><sums i=""><sums i="">/* * Created on Oct 29, 2005 */ One of my friends was preparing for cat, which has quantitative tests. So he needed to work on his calculations. I wrote this for him. It gives arithmatic problems and their answers. You may set the hardness. Again I hope I have commented it well enough to understand the code. package name.shabda.cat; /** * @author shabda */ public class Cat { final int sums=10;//The number of questions asked. final int x=3;//Humm. Why 3? Coz for basic maths operations we need 3 values like 2+3=5.1st 2,2nd 3, third 5. int hardness=1;//how hard do you want the questions. Heigher values give harder questions. public int[][] doMultiply(){//returns a array containing arithmatic problems on multiplication. //Like for 2+3=5, arr[0][0]=2,arr[0][1]=3,arr[0][2]=5. int[][] arr=new int[sums][x]; for(int i=0;i<sums;i++){ int howHard=(int) Math.pow(10,hardness); arr[i][0]=(int) (Math.random()*100*howHard); arr[i][1]=(int) (Math.random()*100*howHard); arr[i][2]=arr[i][0]*arr[i][1]; } return arr; } public double[][] doDivide(){//returns a array containing arithmatic problems on Division. int howHard=(int) Math.pow(10,hardness); double[][] arr=new double[sums][x]; for(int i=0;i<sums;i++){ arr[i][0]=(int) (Math.random()*100*howHard); arr[i][1]=(int) (Math.random()*100*howHard); arr[i][2]=arr[i][0]/arr[i][1]; } return arr; } public int[][] doSum(){//returns a array containing arithmatic problems on addition. int howHard=(int) Math.pow(10,(hardness*2)); int[][] arr=new int[sums][x]; for(int i=0;i<sums;i++){ arr[i][0]=(int) (Math.random()*100*howHard); arr[i][1]=(int) (Math.random()*100*howHard); arr[i][2]=arr[i][0]+arr[i][1]; } return arr; } public int[][] doSub(){//returns a array containing arithmatic problems on subtraction. int howHard=(int) Math.pow(10,(hardness*2)); int[][] arr=new int[sums][x]; for(int i=0;i<sums;i++){ arr[i][0]=(int) (Math.random()*100*howHard); arr[i][1]=(int) (Math.random()*100*howHard); arr[i][2]=arr[i][0]-arr[i][1]; } return arr; } public String stringMult(){//Lets convert the array to a nice string. String data=""; int[][] arr=doMultiply(); for(int i=0;i<sums;i++){ String temp=""+arr[i][0]+"*"+arr[i][1]; data+=temp; data+="\n"; } for(int i=0;i<5;i++){ data+="\n"; } for(int i=0;i<sums;i++){ String temp=""+arr[i][0]+"*"+arr[i][1]+"="+arr[i][2]; data+=temp; data+="\n"; } return data; } public String stringDiv(){//Lets convert the array to a nice string. String data=""; double[][] arr=doDivide(); for(int i=0;i<sums;i++){ String temp=""+arr[i][0]+"/"+arr[i][1]; data+=temp; data+="\n"; } for(int i=0;i<5;i++){ data+="\n"; } for(int i=0;i<sums;i++){ String temp=""+arr[i][0]+"/"+arr[i][1]+"="+arr[i][2]; data+=temp; data+="\n"; } return data; } public String stringSub(){//Lets convert the array to a nice string. String data=""; int[][] arr=doSub(); for(int i=0;i<sums;i++){ String temp=""+arr[i][0]+"-"+arr[i][1]; data+=temp; data+="\n"; } for(int i=0;i<5;i++){ data+="\n"; } for(int i=0;i<sums;i++){ String temp=""+arr[i][0]+"-"+arr[i][1]+"="+arr[i][2]; data+=temp; data+="\n"; } return data; } public String stringAdd(){//Lets convert the array to a nice string. String data=""; int[][] arr=doSum(); for(int i=0;i<sums;i++){ String temp=""+arr[i][0]+"+"+arr[i][1]; data+=temp; data+="\n"; } for(int i=0;i<5;i++){ data+="\n"; } for(int i=0;i<sums;i++){ String temp=""+arr[i][0]+"+"+arr[i][1]+"="+arr[i][2]; data+=temp; data+="\n"; } return data; } public static void main(String[] args){//Just a check. Cat app=new Cat(); System.out.println("Div"); System.out.println(app.stringDiv()); System.out.println("Add"); System.out.println(app.stringAdd()); System.out.println("Sub"); System.out.println(app.stringSub()); } } And we need a class to display the problems. So here we go. //CatGui /* * Created on Nov 3, 2005 * * TODO To change the template for this generated file go to * Window - Preferences - Java - Code Style - Code Templates */ package name.shabda.cat; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.BoxLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JPanel; import javax.swing.JTextArea; /** * @author shabda * * TODO To change the template for this generated type comment go to * Window - Preferences - Java - Code Style - Code Templates */ public class CatGui { Cat engine; JButton add,sub,mult,div; JTextArea result; JPanel buttons,display; JMenuBar theMenu; JMenuItem easy=new JMenuItem("easy"); JMenuItem hard=new JMenuItem("hard"); JMenuItem harder=new JMenuItem("harder"); /** * */ public CatGui() { engine=new Cat(); add=new JButton("add"); sub=new JButton("sub"); mult=new JButton("mult"); div=new JButton("div"); buttons=new JPanel(); buttons.setLayout(new FlowLayout()); buttons.add(add); buttons.add(sub); buttons.add(mult); buttons.add(div); result=new JTextArea(26,20); result.setPreferredSize(new Dimension(200,300)); result.setEditable(false); display=new JPanel(); display.setLayout(new BoxLayout(display, BoxLayout.Y_AXIS)); display.add(result); display.add(buttons); addActionListeners(); theMenu=new JMenuBar(); JMenu hardness=new JMenu("how hard?"); hardness.add(easy); hardness.add(hard); hardness.add(harder); theMenu.add(hardness); } public void addActionListeners(){ add.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { result.setText(engine.stringAdd()); }}); sub.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { result.setText(engine.stringSub()); }}); mult.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { result.setText(engine.stringMult()); }}); div.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { result.setText(engine.stringDiv()); }}); easy.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { engine.hardness=1; }}); hard.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { engine.hardness=2; }}); harder.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { engine.hardness=3; }}); } public static void main(String[] args){ CatGui theGui=new CatGui(); JFrame f=new JFrame(); f.getContentPane().add(theGui.display); f.setJMenuBar(theGui.theMenu); f.pack(); f.setVisible(true); f.addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent arg0) { System.exit(0); } }); } } </sums></sums></sums></sums></sums></sums></sums></sums></sums></sums></sums></sums>shabdahttp://www.blogger.com/profile/07961528262493927188noreply@blogger.com