Calculator Array
Hi everyone,
Making an array for a calculator, and am stuck and have 57 similar errors. If someone can check what's wrong and show it to me that'll be great...
Thanks
PART 1
import javax.swing.*;
public class TestMySwing{
* @param args
public static void main(String[]args){
try{
CalculatorSwing frame = new CalculatorSwing();
frame.setVisible(true);
}catch(Exception e){
System.out.println("My Exception"+e.toString());
PART 2
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class CalculatorSwing extends JFrame{
public CalculatorSwing(){
setTitle("Calculator");
//setSize(300,200);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension d = tk.getScreenSize();
int screenHeight = d.height;
int screenWidth = d.width;
System.out.println(screenHeight+":"+screenWidth);
setSize(180,270);//screenWidth/2, screenHeight/2);
setLocation(screenWidth/4,screenHeight/4);
Container contentP = getContentPane();
contentP.add(new ButtonPanel());
class ButtonPanel extends JPanel implements ActionListener{
public ButtonPanel(){
oneButton = new JButton("1");
twoButton = new JButton("2");
threeButton = new JButton("3");
fourButton = new JButton("4");
fiveButton = new JButton("5");
sixButton = new JButton("6");
sevenButton = new JButton("7");
eightButton = new JButton("8");
nineButton = new JButton("9");
zeroButton = new JButton("0");
eqButton = new JButton("=");
plusButton = new JButton("+");
minusButton = new JButton("-");
multiplyButton = new JButton("*");
divideButton = new JButton("/");
cButton = new JButton("C");
dotButton = new JButton(".");
displayCalc = new JTextField("",12);
displayCalc.setEditable(false);
JButton[]name = newJButton[oneButton,twoButton, threeButton,
fourButton, fiveButton, sixButton, sevenButton, eightButton, nineButton,
zeroButton, eqButton, plusButton, minusButton, multiplyButton, divideButton,
cButton, dotButton];
for (i=0; i<17; i++){
add(button);
for (i=0; i<17; i++){
buttons[i].addActionListerner(this);
// myGlass();
public void painComponent(Graphics g){
super.paintComponent(g);
// g.drawString("Hello to everybody!",75,100);
public double performOperation(char ch1, double num){
if (ch1=='-'){
num-=Double.parseDouble(displayCalc.getText());
}else if(ch=='+'){
num+=Double.parseDouble(displayCalc.getText());
}else if(ch=='/'){
num=num/Double.parseDouble(displayCalc.getText());
}else if(ch=='*'){
num*=Double.parseDouble(displayCalc.getText());
return num;
public boolean checkVal(char chh){
if (chh=='-'||chh=='+'||chh=='/'||chh=='*'){
return true;
}else{
return false;
public void actionPerformed(ActionEvent evt){
Object source = evt.getSource();
Color color = getBackground();
if(source == eqButton){
if(checkVal(ch)){
displayCalc.setText(""+performOperation(ch, tempNo));
//displayCalc.setText(""+((Interger.parseInt(displayCalc,getTExt()))+7));
}else if(source == dotButton){
displayCalc.setText(displayCalc.getText()+".");
System.out.println("1");
}else if(source == oneButton){
displayCalc.setText(displayCalc.getText()+"1");
System.out.println("1");
}else if(source == twoButton){
displayCalc.setText(displayCalc.getText()+"2");
System.out.println("2");
}else if(source == threeButton) {
displayCalc.setText(displayCalc.getText()+"3");
System.out.println("3");
}else if(source == fourButton) {
displayCalc.setText(displayCalc.getText()+"4");
System.out.println("4");
}else if(source == fiveButton) {
displayCalc.setText(displayCalc.getText()+"5");
System.out.println("5");
}else if(source == sixButton) {
displayCalc.setText(displayCalc.getText()+"6");
System.out.println("6");
}else if(source == sevenButton) {
displayCalc.setText(displayCalc.getText()+"7");
System.out.println("7");
}else if(source == eightButton) {
displayCalc.setText(displayCalc.getText()+"8");
System.out.println("8");
}else if(source == nineButton) {
displayCalc.setText(displayCalc.getText()+"9");
System.out.println("9");
}else if(source == zeroButton) {
displayCalc.setText(displayCalc.getText()+"0");
System.out.println("0");
}else if(source == plusButton) {
ch='+';
tempNo=Double.parseDouble(displayCalc.getText());
displayCalc.setText("");
System.out.println("+");
}else if(source == minusButton) {
ch='-';
tempNo=Double.parseDouble(displayCalc.getText());
displayCalc.setText("");
System.out.println("-");
}else if(source == multiplyButton) {
ch='*';
tempNo=Double.parseDouble(displayCalc.getText());
displayCalc.setText("");
System.out.println("*");
}else if(source == divideButton) {
ch='/';
tempNo=Double.parseDouble(displayCalc.getText());
displayCalc.setText("");
System.out.println("/");
}else if(source == cButton){
tempNo = 0;
displayCalc.setText("");
repaint();
private JButton eqButton;
private String calcText = "";
private String textDisp ="";
private double tempNo=0.0;
private char ch='s';
private JButton minusButton;
private JButton plusButton;
private JButton multiplyButton;
private JButton divideButton;
private JButton oneButton;
private JButton twoButton;
private JButton threeButton;
private JButton fourButton;
private JButton fiveButton;
private JButton sixButton;
private JButton sevenButton;
private JButton eightButton;
private JButton nineButton;
private JButton zeroButton;
private JTextField displayCalc;
private JButton cButton;
private JButton dotButton;
Edited by: Hao.Tran on Nov 26, 2007 9:26 PM
Hao.Tran wrote:
it compiles but the there is a 'class' or 'interface' expected for lines 64 and lines 172-193 (those being the last like 20).That's not the only error you got I only made your code compilable and runnable.
You still have a long way to go and your code is a mess.
In the future Swing related questions should be posted in the Swing forum.
http://forum.java.sun.com/forum.jspa?forumID=57
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class CalculatorSwing extends JFrame {
public CalculatorSwing(){
setTitle("Calculator");
//setSize(300,200);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension d = tk.getScreenSize();
int screenHeight = d.height;
int screenWidth = d.width;
System.out.println(screenHeight+":"+screenWidth);
setSize(180,270);//screenWidth/2, screenHeight/2);
setLocation(screenWidth/4,screenHeight/4);
Container contentP = getContentPane();
contentP.add(new ButtonPanel());
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new CalculatorSwing().setVisible(true);
class ButtonPanel extends JPanel implements ActionListener {
public ButtonPanel() {
oneButton = new JButton("1");
twoButton = new JButton("2");
threeButton = new JButton("3");
fourButton = new JButton("4");
fiveButton = new JButton("5");
sixButton = new JButton("6");
sevenButton = new JButton("7");
eightButton = new JButton("8");
nineButton = new JButton("9");
zeroButton = new JButton("0");
eqButton = new JButton("=");
plusButton = new JButton("+");
minusButton = new JButton("-");
multiplyButton = new JButton("*");
divideButton = new JButton("/");
cButton = new JButton("C");
dotButton = new JButton(".");
displayCalc = new JTextField("",12);
displayCalc.setEditable(false);
JButton[] name = {oneButton,twoButton, threeButton,
fourButton, fiveButton, sixButton, sevenButton, eightButton, nineButton,
zeroButton, eqButton, plusButton, minusButton, multiplyButton, divideButton,
cButton, dotButton};
int i;
for (i = 0; i < 17; i++) {
add(name);
for (i = 0; i < 17; i++) {
name[i].addActionListener(this);
// myGlass();
public void painComponent(Graphics g) {
super.paintComponent(g);
// g.drawString("Hello to everybody!",75,100);
public double performOperation(char ch1, double num) {
if (ch1=='-'){
num-=Double.parseDouble(displayCalc.getText());
}else if(ch=='+'){
num+=Double.parseDouble(displayCalc.getText());
}else if(ch=='/'){
num=num/Double.parseDouble(displayCalc.getText());
}else if(ch=='*'){
num*=Double.parseDouble(displayCalc.getText());
return num;
public boolean checkVal(char chh) {
if (chh=='-'||chh=='+'||chh=='/'||chh=='*'){
return true;
}else{
return false;
public void actionPerformed(ActionEvent evt) {
Object source = evt.getSource();
Color color = getBackground();
if(source == eqButton){
if(checkVal(ch)){
displayCalc.setText(""+performOperation(ch, tempNo));
//displayCalc.setText(""+((Interger.parseInt(displayCalc,getTExt()))+7));
}else if(source == dotButton){
displayCalc.setText(displayCalc.getText()+".");
System.out.println("1");
}else if(source == oneButton){
displayCalc.setText(displayCalc.getText()+"1");
System.out.println("1");
}else if(source == twoButton){
displayCalc.setText(displayCalc.getText()+"2");
System.out.println("2");
}else if(source == threeButton) {
displayCalc.setText(displayCalc.getText()+"3");
System.out.println("3");
}else if(source == fourButton) {
displayCalc.setText(displayCalc.getText()+"4");
System.out.println("4");
}else if(source == fiveButton) {
displayCalc.setText(displayCalc.getText()+"5");
System.out.println("5");
}else if(source == sixButton) {
displayCalc.setText(displayCalc.getText()+"6");
System.out.println("6");
}else if(source == sevenButton) {
displayCalc.setText(displayCalc.getText()+"7");
System.out.println("7");
}else if(source == eightButton) {
displayCalc.setText(displayCalc.getText()+"8");
System.out.println("8");
}else if(source == nineButton) {
displayCalc.setText(displayCalc.getText()+"9");
System.out.println("9");
}else if(source == zeroButton) {
displayCalc.setText(displayCalc.getText()+"0");
System.out.println("0");
}else if(source == plusButton) {
ch='+';
tempNo=Double.parseDouble(displayCalc.getText());
displayCalc.setText("");
System.out.println("+");
}else if(source == minusButton) {
ch='-';
tempNo=Double.parseDouble(displayCalc.getText());
displayCalc.setText("");
System.out.println("-");
}else if(source == multiplyButton) {
ch='*';
tempNo=Double.parseDouble(displayCalc.getText());
displayCalc.setText("");
System.out.println("*");
}else if(source == divideButton) {
ch='/';
tempNo=Double.parseDouble(displayCalc.getText());
displayCalc.setText("");
System.out.println("/");
}else if(source == cButton){
tempNo = 0;
displayCalc.setText("");
repaint();
private JButton eqButton;
private String calcText = "";
private String textDisp ="";
private double tempNo=0.0;
private char ch='s';
private JButton minusButton;
private JButton plusButton;
private JButton multiplyButton;
private JButton divideButton;
private JButton oneButton;
private JButton twoButton;
private JButton threeButton;
private JButton fourButton;
private JButton fiveButton;
private JButton sixButton;
private JButton sevenButton;
private JButton eightButton;
private JButton nineButton;
private JButton zeroButton;
private JTextField displayCalc;
private JButton cButton;
private JButton dotButton;
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"nelsons" wrote in message
news:[email protected]...
> how do I create a 1d array that takes a single calculation and insert
> the result into the first row and then the next calculation the next
> time the loop passes that point and puts the results in thsecond row
> and so on until the loop is exited.
>
> The attached file is work inprogress, with some dummy data sp that I
> can test it out without having to connect to equipment.
> The second tab is the one that I am having the problem with. the
> output array from the replace element appears to be starting at the
> index position of 1 rather than 0 but that is ok it is still show that
> the new data is placed in incrementing element locations. However the
> main array that I am trying to build that is suppose to take each new
> calculation and place it in the next index(row) does not appear to be
> working or at least I am not getting any indication on the inidcator.
>
> Basically what I am attempting to do is is gather some pulses from
> adevice for a minute, place the results for a calculation, so that it
> displays then do the same again the next minute, but put these result
> in the next row and so on until the specifiied time has expired and
> the loop exits. I need to have all results displayed and keep building
> the array(display until, the end of the test)Eventually I will have to
> include a min max section that displays the min and max values
> calculated, but that should be easy with the min max function.Actually
> I thought this should have been easy but, I gues I can not see the
> forest through the trees. Can any one help to slear this up for me. -
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I have a acquaried 1D array of data-points. Now, I have to find the element in this array which value is the closest to a calculated "target value".
After finding the element with the value close to the "target value", I have to get the position of this element (i.e. the index) in the 1D array.
Now, I have to use this index to find and extract the element at this position in an other 1D array.
It would be very nice if somebody could help me with this problem.
Thank you,
beamFind attached a sample vi that you can modify.
Attachments:
select_target_value.vi 22 KB -
hi gurus,
I have to use array for some calculations. I begin new project and have to calculate distance with using array. I searched forums but I found nothing. please help me?
thanks,#include <stdio.h>
int main()
int m,n,mat[100][100],i,j,l;
int a,b,top,max=50000;
char k1='c';
printf("total country = ");
scanf(" %d", &n);
printf(" total direction = "); // total road: A-C is a road B-G is another road
scanf(" %d", &m);
for(i=1;i<=n;i++){
for(j=1;j<=n;j++){
mat<i>[j]=max;
for(i=1;i<=n;i++)
mat<i><i>=0;
for(i=1;i<=m;i++)
printf("enter first country ");
scanf("%d", &a);
printf("enter second country",i);
scanf(" %d", &b);
printf("intervals of countries");
scanf("%d", &mat[a]<b>);
mat<b>[a]=mat[a]<b>;
for(l=1;l<=n;l++)
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
top=mat<i>[l] + mat[l][j];
if(top < mat<i>[j]){
mat<i>[j]=top;
while(k1 != 'q')
printf(" enter to find interval of 2 countries = ");
scanf(" %d", &a);
scanf(" %d", &b);
printf(" min interval = %d \n",mat[a]<b>);
printf(" q for quit any key for continue = ");
scanf(" %c", &k1);
intervals: 1) A-B = 600
2) A-C=50 C-F=150 F-G= 200 G-B=50 (that is A-B = 450)
3) A-D=100 D-H=200 H-G=50 G-B=50. (that is A-B = 400)
example records in my table
A | B | C | D | F | G | H
A | 0 | 600 | 50 | 100 | - | - | -
B |600 | 0 | - | - | - | 50| -
C | 50 | - | 0 | - | 150| - | -
D |100 | - | - | 0 | - | - |200
F |- | - |150| - | 0 |200|-
G |- | 50 |- | - | 200| 0 |50
H |- |- | - | 200 | - | 50| 0
after program run
A | B | C | D | F | G | H
A | 0 | 400 | 50 | 100 | 200 |350 | 300
B |400 | 0 | 400| 300 | 250 | 50 | 100
C | 50 | 400 | 0 | 150 | 150 | 350 | 400
D |100 |300 | 150 | 0 | 300 | 250 |200
F |200 |250 |150 |300 | 0 | 200 |250
G |350 | 50 |350 | 250 | 200 | 0 |50
H |300 |100 | 400 | 200 | 250 | 50 | 0
I dont update my table. I just want find direction and min interval to go from A to B.
I think not hard for gurus.
thank all for help. -
Filtering and calculating averages of array subsets
I've got a 2-D array coming out of a loop and I need to calculate average for subsets corresponding to iterations 0-9, 10-19, etc.. Additionally, I need to filter out values above and below acceptable limits before calculating average. Any suggestions for how to approach this?
Solved!
Go to Solution.My suggestion is to slog through each array subset, use a for loop to add up the values you want, keep track of the number of values, then divide out for the average.
Every tenth reading you could clear the sum and counts.
The results would be saved in an array that only adds a value every tenth loop.
You could keep track of the one to ten value separately from the number of values accepted ( a.k.a. Filtering).
So my slog suggestion would be a for loop, two counters ( # accepted values and one to ten count), an array to store the averages and a numeric to hold the sum.
The filter criteria would produce a Boolean that would toggle adding to the sum and adding to the # accepted values.
The Sum and the counters need to be shift registers, and as I mentioned, there would be some logic to clear these shift registers every time the 'one to ten' count got to ten
Mark Ramsdale -
Calculating Mean & SD in Test Stand Locals Array
Hi,
I have an array of data that I would like to process to extract the statistical info like mean, SD etc. Is there a ready made function available in Test Stand to do this without writing custom expressions?
ThanksK_seeker,
Unfortunately, TestStand does not have built in expression functions for calculating statistical information. You can see a list of all of the expression functions here: http://zone.ni.com/reference/en-XX/help/370052H-01/tssuppref/infotopics/operators_function_expr/
The easiest way to get the information you want is to pass the array to a code module (LabVIEW VI, CVI .dll, .NET assembly, etc.), do the arithmetic there, and pass the final value back to TestStand.
Josh W.
Certified TestStand Architect
Formerly blue -
Simple Graphing Calculator with 2D array
Hello,
I am building a simple graphing calculator which reads in coefficients from a txt file. All is going well except when I plot the points, the graph is at the corner of the screen and sideways. As we all know, the origin of the array is at the top right corner, so how do I transform/slide it so that it is at the xy origin? Code is posted below, thanks!
import javax.swing.*;
import java.awt.*;
public class baseClass extends JFrame{
private shapesPanel panel;
public baseClass(String title){
panel = new shapesPanel();
setTitle(title);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
getContentPane().add(panel);
pack();
setVisible(true);
public void drawLine(int x1, int y1, int x2, int y2){
panel.addLine((short)x1,(short)y1,(short)x2,(short)y2);
panel.repaint();
public void drawDot(int x, int y){
panel.addOval((short)x,(short)y,(short)1,(short)1);
panel.repaint();
private class shapesPanel extends JPanel{
final private short max = 10000;
private short[][] lines, ovals;
private int numLines, numOvals;
public shapesPanel(){
setBackground(Color.white);
setPreferredSize (new Dimension(500,500));
lines = new short[max][4];
ovals = new short[max][4];
numLines = 0;
numOvals = 0;
public void paintComponent(Graphics g){
super.paintComponent(g);
g.setColor(new Color(0,0,255));
for(int i = 0; i < numLines;++i){
g.drawLine(lines[0],lines[i][1],lines[i][2],lines[i][3]);
g.setColor(new Color(255,0,0));
for(int i = 0; i < numOvals;++i){
g.drawOval(ovals[i][0],ovals[i][1],ovals[i][2],ovals[i][3]);
public void addLine(short x1, short y1, short x2, short y2){
lines[numLines][0] = x1;
lines[numLines][1] = y1;
lines[numLines][2] = x2;
lines[numLines][3] = y2;
++numLines;
public void addOval(short x, short y, short w, short h){
ovals[numOvals][0] = x;
ovals[numOvals][1] = y;
ovals[numOvals][2] = w;
ovals[numOvals][3] = h;
++numOvals;
import java.util.Scanner;
import java.io.*;
public class graphingCalculator extends baseClass{
// CONTAINS THE FOUR FUNCTION COEFFICIENTS
private double[] theFunction;
// CONTAINS THE DISCRETE FUNCTION PLOT
private boolean[][] grid;
// SIZE OF THE COORDINATE SYSTEM
private final int columns = 500, rows = 500;
public graphingCalculator(String filename) throws IOException{
// INITIALIZATIONS ///////////////////////////////////////
super("GRAPHING CALCULATOR");
theFunction = new double[4];
grid = new boolean[rows][columns];
for(int i = 0;i<rows;++i){
for(int j = 0;j<columns;++j){
grid[i][j] = false;
// DRAW THE COORDINATE SYSTEM ON THE SCREEN /////////////
drawLine(0,250,500,250);
drawLine(250,0,250,500);
for(int i = 0; i < columns;i+=20){
drawLine(i,247,i,253);
for(int i = 0; i < rows;i+=20){
drawLine(247,i,253,i);
// GET THE FUNCTION COEFFICIENTS ///////////////////////
// theFunction[0] will have the x^3 coefficient
// theFunction[1] will have the x^2 coefficient
// theFunction[2] will have the x^1 coefficient
// theFunction[3] will have the x^0 coefficient
Scanner scan1 = new Scanner(new File(filename));
for(int i=0;i<4;++i){
theFunction[i] = scan1.nextDouble();
scan1.close();
// DRAW THE FUNCTION ////////////////////////////////////
computeGrid();
drawDiscrete();
drawContinuous();
private double computeFunction(int x)
double a=theFunction[0];
double b=theFunction[1];
double c=theFunction[2];
double d=theFunction[3];
double answer=(a*Math.pow(x,3.0)+b*Math.pow(x,2.0)+c*Math.pow(x,1.0)+d*Math.pow(x,0.0));
return answer;
private void computeGrid()
// Populate the 'grid' array with true values that correspond
// to the discrete function.
// The 'grid' array is the internal representation of the function
for(int x=0; x<columns; x++)
if(computeFunction(x)>=0&&computeFunction(x)<500)
grid[(int)computeFunction(x)][x]=true;
private void drawDiscrete()
// Use drawDot(x,y) to draw the discrete version of the function
for(int x=0;x<columns;x++)
for(int j=0;j<rows;j++)
if(grid[x][j])
drawDot(x,j);
private void drawContinuous()
// Use drawLine(x1,y1,x2,y2) to draw the continuous version of the functionRest of code:
import java.util.Scanner;
import java.io.*;
public class Main {
public static void main(String[] args) throws IOException{
String infile;
Scanner scan = new Scanner(System.in);
// The input file should have 4 doubles in it
// corresponding to the 4 coefficients of a cubic function.
// A GOOD EXAMPLE:
// 0.01
// 0.0
// -5.0
// 50.0
// CORRESPONDS TO FUNCTION: 0.01*X^3 - 5.0*X + 50.0
// ANOTHER GOOD EXAMPLE:
// 0.0
// 0.01
// -1.0
// -100.0
// CORRESPONDS TO FUNCTION: 0.01*X^2 - X - 100.0
System.out.println("Please enter filename of input file: ");
infile = scan.next();
graphingCalculator cal = new graphingCalculator(infile);
} -
Hi All,
I have a small question.I am using SunOS 5.9 and gcc 4.0 compiler.
Please take a look at the below code
When I compile the following program under gcc 4.0 it doesn't give me any compiler error and even the size comes correctly.
#include<stdio.h>
int main()
int c;
scanf("%d",&c);
int x[c];
printf("sizeof =%d\n",sizeof(x));
But when I use visual studio 2003 compiler it gives me error ( like cannot allocate an array of constant size 0).
I am bit confused as normall array size should be static rather during runtime.And I am not using malloc in this case also.
Could you please clarify this.Or is it possible to allocate the array size like this in advanced compilers?
Looking forward for your response.Hello.
I just tested initializing an array with a variable. It works under GCC 3.3.2. I know no other C compiler which is able to do this! In a C tutorial in the internet I found this:
You cannot initialize an array using a variable. [...] For example:
int x = 5;
int ia[x];Obviously initializing arrays with variables is a GCC extension.
If the compiler supports the "alloca" instruction you may use this instead:
int x = 5;
int *ia = (int *)alloca(sizeof(int) * x);
// sizeof(ia) is 4 or 8 (32 or 64 bit) here independent of xMartin -
Calculating mode with interger arrays.
I'm having some trouble implementing code to search for modes inside of an interger array. The array is of values from 0 to 100.
public static String modeFinder(int[] input)
String output = "";
int[] modes = new int[input.length/2];
int[] occurances = new int[input.length/2];
int counter = 0;
int counter2 = 0;
for (int i = 0; i < input.length; i++)
int num1 = input;
for (int j = 0; j < input.length; j++)
if (input[i] == input[j])
counter++;
if (counter > 1)
modes[counter2] = num1;
occurances[counter2] = counter;
counter2++;
The last part is where i am having trouble. I esentially need to find the highest value in the occurances array and then check to see if there are multiple modes and then make a connection with the modes array of actual interger values that are a part of the mode. Thanks for any help.Now you get to figure out how I did it....
public class Test {
public static void main(String[] args) {
int[] myInt = {1,2,3,4,5,6,7,6,5,4,3,2,1,2,3};
int min=100, max=0;
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if (myInt[x]>max) max=myInt[x];
if (myInt[x]<min) min=myInt[x];
System.out.println("min="+min+" max="+max);
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for (int x=0; x<cnts.length; x++) if (cnts[x]>maxCnt) maxCnt = cnts[x];
for (int x=0; x<cnts.length; x++) if (cnts[x]==maxCnt) System.out.println("mode at "+(x+min));
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