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Programming Articles
Page 2458 of 2547
regex_error in C++
The regex library has different methods and features related to regular expressions. Here we will see some regex_errors. These are also present at regex library. During executing some regular expressions, we get some errors. That errors are mentioned here.FlagsErrorserror_collateIn the Regex, the names having invalid collation.error_ctypeIn the Regex, there is an invalid character class name.error_stackNot enough memory to determine regex can be matched or not.error_spaceConvert into Finite State Machine, when memory is insufficienterror_badrepeatThe string has repeat specifier ( *?+{) that was not preceded by a valid regular expression.error_complexityThe complexity of an attempted match against a regex exceeded a pre-set levelerror_rangeContaining ...
Read MoreC++ tricks for competitive programming (for C++ 11)?
Here we will see some good tricks of C++ programming language that can help us in different area. Like if we want to participate in some competitive programming events, then these tricks will help us to reduce the time for writing codes. Let us see some of these examples one by one.Checking whether a number is odd or even without using % operator. This trick is simple. We can perform bitwise AND operation with the number and 1. If the result is non-zero then this is odd, otherwise this is even. The logic is too simple. All odd numbers have ...
Read MoreWhat does buffer flush means in C++ ?
The buffer flush is used to transfer of computer data from one temporary storage area to computers permanent memory. If we change anything in some file, the changes we see on the screen are stored temporarily in a buffer.In C++, we can explicitly have flushed to force the buffer to be written. If we use std::endl, it adds one new line character, and also flush it. If this is not used, we can explicitly use flush. In the following program at first no flush is used. Here we are trying to print the numbers, and wait for one seconds. For ...
Read MoreHow to apply adjustments to the next column of a JTable only, when the width of a column is changed in Java Swing?
To apply adjustments to the next column only, use the setAutoResizeMode and set the mode. The mode here would be AUTO_RESIZE_NEXT_COLUMN. This will allow you to adjust only the next column even if any of the column header is dragged to resize.Let us first see an example to create a table −Examplepackage my; import java.awt.Font; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.table.DefaultTableModel; public class SwingDemo { public static void main(String[] argv) throws Exception { DefaultTableModel tableModel = new DefaultTableModel(); JTable table = new JTable(tableModel); tableModel.addColumn("Technology"); tableModel.addColumn("BCA"); ...
Read MoreWhat is NaN in C++?
The NaN is the abbreviation of Not a Number. It indicates undefined or non-representable floating point elements. One example of NaN is square root of some negative number, or result of 0/0.Example#include #include using namespace std; int main() { cout >> "Square root of -5: " >> sqrt(-5) >> endl; }OutputSquare root of -5: nan
Read MoreReverse a string in C/C++ using Client Server model
Here we will see how we can create a system, where we will create one client, and a server, and the client can send one string to the server, and the server will reverse the string, and return back to the client.Here we will use the concept of socket programming. To make the client server connection, we have to create port. The port number is one arbitrary number that can be used by the socket. We have to use the same port for client and the server to establish the connection.To start the program, start the server program first −gcc ...
Read MoreCustomize the JOptionPane layout with updated color and image in Java
Customize the layout by changing the look and feel of the panel in which you added the component −ImageIcon icon = new ImageIcon(new URL("http −//www.tutorialspoint.com/images/C-PLUS.png")); JLabel label = new JLabel(icon); JPanel panel = new JPanel(new GridBagLayout()); panel.add(label); panel.setOpaque(true); panel.setBackground(Color.ORANGE);Above, we have added an image and even updated the background color of the panel.Now, set it for the text panel −JPanel textPanel = new JPanel(new GridLayout(10, 5)); textPanel.setBackground(Color.Magenta);The following is an example to customize the JOptionPane layout −Examplepackage my; import java.awt.BorderLayout; import java.awt.Color; import java.awt.GridBagLayout; import java.awt.GridLayout; import java.net.URL; import javax.swing.ImageIcon; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; public class SwingDemo { ...
Read Moretransform() in C++
The transform function is present in the C++ STL. To use it, we have to include the algorithm header file. This is used to perform an operation on all elements. For an example if we want to perform square of each element of an array, and store it into other, then we can use the transform() function.The transform function works in two modes. These modes are −Unary operation modeBinary operation modeUnary Operation ModeIn this mode the function takes only one operator (or function) and convert into output.Example#include #include using namespace std; int square(int x) { //define square ...
Read MoreJava Connection getCatalog() method with example
In general, a catalog is a directory which holds information about data sets, file or, a database. Whereas in a database catalog holds the list of all the databases, base tables, views (virtual tables), synonyms, value ranges, indexes, users, and user groups.The getCatalog() method of the Connection interface returns the name of the current catalog/database, of the current connection object.This method returns a Sting value representing the name of the catalog. It returns null if there is no catalog.To get the catalog name −Register the driver using the registerDriver() method of the DriverManager class as −//Registering the Driver DriverManager.registerDriver(new com.mysql.jdbc.Driver());Get the connection ...
Read MoreCan we read from JOptionPane by requesting input from user in Java?
Yes, we can read from JOptionPane. Here, we will get the result of the showInputDialog() in a String variable −String input = JOptionPane.showInputDialog("Enter the C++ lessons you covered till now?");After getting the result, we will convert it to integer with parseInt() and display it on Console −int res = Integer.parseInt(input); System.out.println("Lessons covered = "+res);The following is an example to read from JOptionPane by requesting input from user −Examplepackage my; import java.awt.BorderLayout; import java.awt.Color; import java.awt.GridBagLayout; import java.awt.GridLayout; import java.net.URL; import javax.swing.ImageIcon; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; public class SwingDemo { public static void main(String[] args) throws Exception { ...
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