Here we will see how to print long int value using the putchar() function in C. We can easily print the value of some variables using printf() in C, but here the restriction is, we cannot use any other function except putchar().As we know that the putchar() is used to print only characters. We can use this function to print each digit of the number. When one numeric value is passed, we have to add character ‘0’ with it to get the ASCII form. Let us see the code to get the better idea.Example#include void print_long(long value) {   ... Read More

To set Titled Border to Panel, let us first create a Panel for our Java Swing Application:JPanel panel = new Jpanel(new BorderLayout());Now, set the titled border:panel.setBorder(new TitledBorder("Displaying Titled Border"));The following is an example to add Titled Border to Panel in Swing:Exampleimport java.awt.BorderLayout; import javax.swing.JButton; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.border.TitledBorder; public class SwingDemo {    public static void main(String[] args) {       JPanel panel = new JPanel(new BorderLayout());       panel.setBorder(new TitledBorder("Displaying Titled Border"));       panel.add(new JButton("Demo Button"), BorderLayout.SOUTH);       JOptionPane.showMessageDialog(null, panel);    } }OutputRead More

In this problem, one floating point value is given. We have to find number of set bits in the binary representation of it.For example, if a floating point number is 0.15625, so there are six set bits. A typical C compiler used single precision floating point representation. So it will be look like this.To convert into its bit values, we have to take the number into one pointer variable, then typecast the pointer to char* type data. Then process each byte one by one. Then we can count set bits of each char.Example#include int char_set_bit_count(char number) {    unsigned ... Read More

To set fullscreen mode for your Java Swing application, use the setFullScreenWindow() method:GraphicsDevice device = graphics.getDefaultScreenDevice(); JFrame frame = new JFrame("Fullscreen"); device.setFullScreenWindow(frame);The following is an example to set fullscreen mode for Java Swing Application:Exampleimport java.awt.Color; import java.awt.GraphicsDevice; import java.awt.GraphicsEnvironment; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; public class SwingDemo {    public static void main(String[] args) {       GraphicsEnvironment graphics =       GraphicsEnvironment.getLocalGraphicsEnvironment();       GraphicsDevice device = graphics.getDefaultScreenDevice();       JFrame frame = new JFrame("Fullscreen");       JPanel panel = new JPanel();       JLabel label = new JLabel("", JLabel.CENTER);     ... Read More

To use the sizeof(), we can take the value using a variable x, using &x, it will print the address of it. Now if we increase the value of &x then it may increase in different way. If only one byte is increased, that means it is character, if the increased value is 4, then it is int or float and so on. So by taking the difference between &x + 1 and &x, we can get the size of x.Here we will use macro as the datatype is not defined in the function. And one more thing, we are ... Read More

Here we will see how to print the memory representation of C variables. Here we will show integers, floats, and pointers.To solve this problem, we have to follow these steps −Get the address and the size of the variableTypecast the address to the character pointer to get byte addressNow loop for the size of the variable and print the value of typecasted pointer.Example#include typedef unsigned char *byte_pointer; //create byte pointer using char* void disp_bytes(byte_pointer ptr, int len) {     //this will take byte pointer, and print memory content    int i;    for (i = 0; i < ... Read More

The memory leak occurs, when a piece of memory which was previously allocated by the programmer. Then it is not deallocated properly by programmer. That memory is no longer in use by the program. So that place is reserved for no reason. That’s why this is called the memory leak.For the memory leak, some block of memory may have wasted. If the system has enough memory, in that case also this may slow down the performance.Examplevoid my_func() {    int *data = new int;    *data = 50; }Here the problem is *data pointer is never deleted, so memory is ... Read More

At first set the label on which you want the custom cursor to be visible on hover:JLabel label = new JLabel("Demo text! Hand cursor is visible on hover...");Now, set cursor to be visible as Hand Cursor instead of the default Cursor:label.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));The following is an example to make a custom cursor appear when the user moves the mouse over some text:Exampleimport java.awt.Cursor; import javax.swing.JDialog; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; public class SwingDemo extends JFrame {    private void ShowDialog() {       JLabel label = new JLabel("Demo text! Hand cursor is visible on hover...");       label.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));   ... Read More

In C we can pass parameters in two different ways. These are call by value, and call by address, In C++, we can get another technique. This is called Call by reference. Let us see the effect of these, and how they work.First we will see call by value. In this technique, the parameters are copied to the function arguments. So if some modifications are done, that will update the copied value, not the actual value.Example#include using namespace std; void my_swap(int x, int y) {    int temp;    temp = x;    x = y;    y = ... Read More

To get the font metrics, use the FontMetrics class:Graphics2D graphics = (Graphics2D) gp.create(); String str = getWidth() + "(Width) x (Height)" + getHeight(); FontMetrics m = graphics.getFontMetrics();Now to display it:int xValue = (getWidth() - m.stringWidth(str)) / 2; int yValue = ((getHeight() - m.getHeight()) / 2) + m.getAscent(); graphics.drawString(str, xValue, yValue);The following is an example to get the font metrics in Java Swing:Exampleimport java.awt.BorderLayout; import java.awt.Dimension; import java.awt.FontMetrics; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Color; import javax.swing.JFrame; import javax.swing.JPanel; public class SwingDemo {    public static void main(String[] args) {       JFrame frame = new JFrame("Font Metrics");       ... Read More