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Here we will see what is the use of ldexp() method in C or C++. This function returns any variable x raise to the power of exp value. This takes two arguments x and exp.The syntax is like below.float ldexp (float x, int exp) double ldexp (double x, int exp) long double ldexp (long double x, int exp) double ldexp (T x, int exp)Now let us see one example to get a better idea.Example#include #include using namespace std; int main() { double a = 10, res; int exp = 2; res = ldexp(a, exp); // Finds a*(2^exp) cout
Here we will see how to print numbers in a correct sequence using different threads. Here we will create n number of threads, then synchronize them. The idea is, the first thread will print 1, then second thread will print 2 and so on. When one thread is trying to print, it will lock the resource, so no thread can use that portion.Example#include #include #include #include pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; pthread_cond_t* cond = NULL; int threads; volatile int count = 0; void* sync_thread(void* num) { //this function is used to synchronize the threads int thread_number ... Read More
Whenever we execute SQL statements using the executeQuery() method, it returns a ResultSet object which holds the tabular data returned by the SELECT queries(in general).The ResultSet object contains a cursor/pointer which points to the current row. Initially this cursor is positioned before first row (default position).You can move the cursor of the ResultSet object to the first row from the current position, using the first() method of the ResultSet interface.rs.first()This method returns a boolean value specifying whether the cursor has been moved to the first row successfully.If there are no rows in the current ResultSet object this method returns false, else it ... Read More
Let’s say we have following MenuBar and menu in it -JMenuBar menuBar = new JMenuBar(); UIManager.put("MenuBar.background", Color.ORANGE); JMenu fileMenu = new JMenu("File"); fileMenu.setMnemonic(KeyEvent.VK_F); menuBar.add(fileMenu);Now, we will create a MenuItem and separate it using the JSeparator():JMenuItem menuItem1 = new JMenuItem("New", KeyEvent.VK_N); fileMenu.add(menuItem1); // separating MenuItems fileMenu.add(new JSeparator());The following is an example to separate Menu Items in a Menu with Java -Examplepackage my; import java.awt.Color; import java.awt.event.KeyEvent; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JSeparator; import javax.swing.UIManager; public class SwingDemo { public static void main(final String args[]) { JFrame frame = new JFrame("MenuBar Demo"); ... Read More
Let us first create a MenuBar −JMenuBar menuBar = new JMenuBar(); UIManager.put("MenuBar.background", Color.ORANGE);To create a submenu for a Menu, the following is an example −Examplepackage my; import java.awt.Color; import java.awt.event.KeyEvent; import javax.swing.ButtonGroup; import javax.swing.JCheckBoxMenuItem; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JRadioButtonMenuItem; import javax.swing.UIManager; public class SwingDemo { public static void main(final String args[]) { JFrame frame = new JFrame("MenuBar Demo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JMenuBar menuBar = new JMenuBar(); UIManager.put("MenuBar.background", Color.ORANGE); JMenu fileMenu = new JMenu("File"); fileMenu.setMnemonic(KeyEvent.VK_F); menuBar.add(fileMenu); ... Read More
You can use aggregate framework. Let us first create a collection with documents −> db.getArrayDemo.insertOne( { "CustomerId":101, "CustomerDetails":[ { "CustomerName":"Larry", "CustomerFriendDetails":[ { "CustomerFriendName":"Sam" }, { "CustomerFriendName":"Robert" } ... Read More
The size attribute of the element is used to set the number of visible list items from a drop-down list. A scrollbar would get added if the size is set more than 1.Following is the syntax−Above, num is the count of the visible list items in the drop-down list.Let us now see an example to implement the size attribute of the element−Example Live Demo Candidate Profile Following are the details to be submitted by the candidate: Educational Qualification Graduation BCA B.COM B.TECH B.SC Postgraduation MCA ... Read More
Passing arrays as function argumentsIn olden days if we need to pass arrays as function arguments then apply() and null should be used. The use of null makes a code unclean. So to make code clean and also to pass an array as a function argument, the spread operator comes in to picture. By using the spread operator we don't need to use apply() function. Lets' discuss it in a nutshell.ExampleIn the following example, we have used null and apply() to pass an array as a function argument. This is an obsolete method. This method is replaced by a modern method in ... Read More
The strol() function is used to convert the string to long integers. It sets the pointer to point to the first character after the last one. The syntax is like below. This function is present into the cstdlib library.long int strtol(const char* str, char ** end, int base)This function takes three arguments. These arguments are like below −str: This is the starting of a string.str_end: The str_end is set by the function to the next character, after the last valid character, if there is any character, otherwise null.base: This specifies the base. The base values can be of (0, 2, ... Read More
Here we will see how to apply the multi-threading concept to search one element in an array. Here the approach is very simple. We will create some threads, then divide the array into different parts. Different thread will search in different parts. After that, when the element is found, enable the flag to identify this.Example#include #include #define MAX 16 #define THREAD_MAX 4 int array[MAX] = { 1, 5, 7, 10, 12, 14, 15, 18, 20, 22, 25, 27, 30, 64, 110, 220 }; int key = 18; int flag = 0; //flag to indicate that item is found ... Read More