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Articles by Smita Kapse
Page 25 of 39
C++ Program to Implement the Hill Cypher
Based on linear algebra Hill cipher is a polygraphic substitution cipher in cryptography.To encrypt message: The key string and message string are represented as matrix form. They are multiplied then, against modulo 26. The key matrix should have inverse to decrypt the message.To decrypt message: The encrypted message is multiplied by inverse key matrix used for encryption against modulo 26 to get decrypt message.For exampleKey matrix1 0 1 2 4 0 3 5 6Message string ‘ABC’ in matrix form −0 1 2For encryptionAfter multiplying above two matrices we get, 2 4 17Which will be the encrypted message ‘CER’For decryptionInverse of ...
Read MoreSet the content of the label horizontally and vertically centered in Java
To simply set the content of the label horizontally and vertically centered, use the constant CENTER.JLabel label = new JLabel("Best IDE", JLabel.CENTER);The following is an example to set the content of the lable horizontally and verticaly centered −Examplepackage my; import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.Font; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextArea; import javax.swing.WindowConstants; public class SwingDemo { public static void main(String[] args) { JFrame frame = new JFrame("Frame"); frame.setLayout(new FlowLayout()); JLabel label = new JLabel("Best IDE", JLabel.CENTER); label.setPreferredSize(new Dimension(190, 100)); label.setOpaque(true); ...
Read MoreLexicographically next permutation in C++
Here we will see how to generate lexicographically next permutation of a string in C++. The lexicographically next permutation is basically the greater permutation. For example, the next of “ACB” will be “BAC”. In some cases, the lexicographically next permutation is not present, like “BBB” or “DCBA” etc.In C++ we can do it by using a library function called next_permutation(). This is present in the algorithm header file.Example#include #include using namespace std; main() { string s = "DBAC"; for(int i = 0; i
Read MoreC++ Program to Find number of Ways to Partition a word such that each word is a Palindrome
Here we shall discuss a C++ Program to find number of ways to Partition a word in such a way that each word is a Palindrome.AlgorithmsBegin Take the word as input. Function partitionadd(vector &u, string &s, vector &tmp, int index): if (index == 0) tmp.clear() for i = index to length-1 st = st + s[i] if (checkPalin(st)) tmp.push_back(st) if (i+1 < length) partitionadd(u, s, tmp, i+1) else ...
Read MoreHow to add button to notifications in android?
This example demonstrate about How to add button to notifications in androidStep 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.package app.tutorialspoint.com.notifyme ; import android.app.NotificationChannel ; import android.app.NotificationManager ; import android.app.PendingIntent ; import android.content.Intent ; import android.os.Bundle ; import android.support.v4.app.NotificationCompat ; import android.support.v7.app.AppCompatActivity ; import android.view.View ; import android.widget.Button ; public class MainActivity extends AppCompatActivity { public static final String NOTIFICATION_CHANNEL_ID = "10001" ...
Read MoreCatch block and type conversion in C++
In this section, we will see how to use the catch block for exception handling and the type conversion in C++.At first, let us see a code, and we will see what will be the output, and how they are generating.Example#include using namespace std; int main() { try{ throw 'a'; } catch(int a) { cout
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 MoreHow to schedule local notifications in Android?
This example demonstrate about How to schedule local notification in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to res/menu/main_menu.xml. Step 4 − Add the following code to src/MainActivity.package app.tutorialspoint.com.notifyme ; import android.app.AlarmManager ; import android.app.Notification ; import android.app.NotificationManager ; import android.app.PendingIntent ; import android.content.Context ; import android.content.Intent ; import android.os.Bundle ; import android.os.SystemClock ; import android.support.v4.app.NotificationCompat ; import android.support.v7.app.AppCompatActivity ...
Read MoreJava Program to create DefaultTableModel from two dimensional array
The DefaultTableModel is an implementation of TableModel that uses a Vector of Vectors to store the cell value objects. At first create a two dimensional array for rows and columns −DefaultTableModel tableModel = new DefaultTableModel(new Object[][] { { "India", "Asia" }, { "Canada", "North America" }, { "Singapore", "Asia" }, { "Malaysia", "Asia" }, { "Philippins", "Asia" }, { "Oman", "Asia" }, { "Germany", "Europe" }, { "France", "Europe" } }, new Object[] { "Country", "Continent" });Above, “Country” and “Continent” are the columns. Now, set the above set of rows and columns to JTable −JTable table = ...
Read MoreInserting an Image into a JTextPane Component with Java
Let’s say the following is our JTextPane with orange background color −JTextPane textPane = new JTextPane(); textPane.setBackground(Color.orange);Now, set the style and attributes. Also, set the font −SimpleAttributeSet attributeSet = new SimpleAttributeSet(); StyleConstants.setItalic(attributeSet, true); textPane.setCharacterAttributes(attributeSet, true); textPane.setText("Recall this and "); Font font = new Font("Verdana", Font.BOLD, 22); textPane.setFont(font);After the text displayed above, we will insert an image using setIcon() −StyledDocument doc = (StyledDocument) textPane.getDocument(); Style style = doc.addStyle("StyleName", null); StyleConstants.setIcon(style, new ImageIcon("E:\kind.png")); doc.insertString(doc.getLength(), "invisible text", style);The following is an example to insert an image into a component. Here, we have inserted an image into a JTextPane component −Examplepackage my; import ...
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