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In C90 standard we have to initialize the arrays in the fixed order, like initialize index at position 0, 1, 2 and so on. From C99 standard, they have introduced designated initializing feature in C. Here we can initialize elements in random order. Initialization can be done using the array index or structure members. This extension is not implemented in GNU C++.If we specify some index and put some value, then it will be look like this -int arr[6] = {[3] = 20, [5] = 40}; or int arr[6] = {[3]20, [5]40};This is equivalent to this:int arr[6] = {0, 0, ... Read More
Set color to MatteBorder using the Color class −Border border = new MatteBorder(5, 10, 5, 5, Color.BLUE);Now, set it to a button component in Java −JButton button = new JButton("Matte Border"); button.setBorder(border);The following is an example to set color to MatteBorder in Java −Examplepackage my; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.border.Border; import javax.swing.border.EtchedBorder; import javax.swing.border.MatteBorder; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Demo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Border raisedBorder = new EtchedBorder(EtchedBorder.RAISED); Border border = new MatteBorder(5, ... Read More
To get the day name from timestamp, use dayname() function −select dayname(yourColumnName) from yourTableName; Let us first create a table : mysql> create table DemoTable ( LoginDate timestamp ); Query OK, 0 rows affected (0.52 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-06-01'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('2019-06-02'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('2019-06-03'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('2019-06-04'); Query OK, 1 row affected (0.11 sec) mysql> insert into ... Read More
The only way to check if a file exist is to try to open the file for reading or writing.Here is an example −In CExample#include int main() { /* try to open file to read */ FILE *file; if (file = fopen("a.txt", "r")) { fclose(file); printf("file exists"); } else { printf("file doesn't exist"); } }Outputfile existsIn C++Example#include #include using namespace std; int main() { /* try to open file to read */ ifstream ifile; ifile.open("b.txt"); if(ifile) { cout
Imagine you’re playing a song and as soon as you press the stop button, the color of the button should turn to red. This is one of the many scenario where you might need to change the color of button when it is clicked.In this tutorial we will see how to change the background color of a button when it is clicked. So let’s get started!Step 1 − Open Xcode → New Projecr → Single View Application → Let’s name it “ChangeButtonColor”Step 2 − In the Main.storyboard create one button and name it stop.Step 3 − Create @IBAction of the ... Read More
Javascript has provided a navigator object with which we can find any information regarding the browser. To get the application name and version information, navigator object has provided navigator.appName() and navigator.appVersion() respectively. Let's discuss each of them individually.Application Name of the browserTo get the application name, the navigator object has provided navigator.appName(). It may sound weird that "Netscape" is the application name for IE11, Chrome, Firefox, and Safari. So the output we get when we use navigator.appName() is Netscape.ExampleLive Demo document.write(navigator.appName); OutputNetscapeBrowser version informationTo get the browser version information, the navigator object has provided ... Read More
To toggle visibility with JCheckBox, use isVisible() method:JCheckBox toggleVisibility = new JCheckBox("Hide/Show"); toggleVisibility.setSelected(comboBox.isVisible()); toggleVisibility.addItemListener(e -> { comboBox.setVisible(e.getStateChange() == ItemEvent.SELECTED); });The following is an example to hide and display JCombobox with a JCheckBox in Java:Exampleimport java.awt.BorderLayout; import java.awt.event.ItemEvent; import javax.swing.*; public class SwingDemo { JFrame frame; SwingDemo(){ frame = new JFrame("ComboBox"); String Sports[]={"Select", "Tennis", "Cricket", "Football"}; JComboBox comboBox = new JComboBox(Sports); comboBox.setBounds(50, 50, 90, 20); frame.add(comboBox, BorderLayout.CENTER); JCheckBox toggleVisibility = new JCheckBox("Hide/Show"); toggleVisibility.setSelected(comboBox.isVisible()); toggleVisibility.addItemListener(e ... Read More
add and assignment(+=) operatorThe add and assignment(+=) operator reduces the code little bit.It may not much influential in small codes whereas coming to long codes it's use can't be ignored. Live DemoExample var tot = 0; var a = [1,45,78,9,78,40]; for(var i = 0; i
Shared memory is a memory shared between two or more processes. However, why do we need to share memory or some other means of communication?To reiterate, each process has its own address space, if any process wants to communicate with some information from its own address space to other processes, then it is only possible with IPC (inter process communication) techniques. As we are already aware, communication can be between related or unrelated processes.Usually, inter-related process communication is performed using Pipes or Named Pipes. Unrelated processes (say one process running in one terminal and another process in another terminal) communication ... Read More
Let’s say we added a menu to the MenuBar −JMenuBar menuBar = new JMenuBar(); JMenu fileMenu = new JMenu("File"); fileMenu.setMnemonic(KeyEvent.VK_F); menuBar.add(fileMenu);Add the glue component in between the menus to align some of them on the right, for example −menuBar.add(Box.createHorizontalGlue());The menu added after the usage of above method, would get right-aligned −JMenu sourceMenu = new JMenu("Source"); sourceMenu.setMnemonic(KeyEvent.VK_S); menuBar.add(sourceMenu);The following is an example to right-align a menu in the menu bar with Java −Examplepackage my; import java.awt.event.KeyEvent; import javax.swing.Box; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; public class SwingDemo { public static void main(final String args[]) { ... Read More