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Here we will see what are the differences between qsort() in C, and sort() in C++.The C provides qsort() function, that can be used for sorting an array. The function arguments and syntax is like below.void qsort(void *base, size_t num, size_t size, int (*comparator) (const void*, const void*));This function takes the base address of that array, the number of elements of that array. Size of each item in the array, and a comparator function.The C++ provides sort() function. This is present inside C++ STL. The arguments and syntax is like below.void sort(T first, T last, Compare c);Here the order of ... Read More
This example demonstrate about How to schedule 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 More
To retrieve a nested object in MongoDB, use $ operator. Let us first create a collection with documents −> db.queryNestedObject.insertOne( ... { ... "StudentName" : "James", ... "StudentSubjectScore" : [ ... {"StudentMongoDBScore":98}, ... {"StudentCScore":92}, ... {"StudentJavaScore":91} ... ] ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5ccf49a9dceb9a92e6aa1962") }Following is the query to display all documents from a collection with the help of find() method −> db.queryNestedObject.find().pretty();This will produce the following output −{ ... Read More
While creating a GridLayout, you need to set the rows and columns as parenthesis. A GridLayout is used to create a layout the specified number of rows and columns.Let’s say we have a GridLayout, with 1 row and 4 columns −GridLayout layout = new GridLayout(1, 4);The following is an example to create a GridLayout with rows and columns −Examplepackage my; import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.Font; import java.awt.GridLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextArea; import javax.swing.WindowConstants; public class SwingDemo { public static void main(String[] args) { JFrame frame = new ... Read More
Yes, you can use the findOne(). Following is the syntax −db.yourCollectionName.findOne();You can use toArray() as well −db.yourCollectionName.find().toArray();Let us first create a collection with documents −> db.betterFormatDemo.insertOne({"StudentName":"Adam Smith", "StudentScores":[98, 67, 89]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd7ab826d78f205348bc640") } > db.betterFormatDemo.insertOne({"StudentName":"John Doe", "StudentScores":[67, 89, 56]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd7ab936d78f205348bc641") } > db.betterFormatDemo.insertOne({"StudentName":"Sam Williams", "StudentScores":[45, 43, 33]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd7aba76d78f205348bc642") }Following is the query to display all documents from a collection with the help of find() method −> db.betterFormatDemo.find();This will produce the following output −{ "_id" : ObjectId("5cd7ab826d78f205348bc640"), "StudentName" ... Read More
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 More
Here we will see how to create own header file using C. To make a header file, we have to create one file with a name, and extension should be (*.h). In that function there will be no main() function. In that file, we can put some variables, some functions etc.To use that header file, it should be present at the same directory, where the program is located. Now using #include we have to put the header file name. The name will be inside double quotes. Include syntax will be look like this.#include”header_file.h”Let us see one program to get the ... Read More
For MongoDB collection beginning with_, following is the syntax −db.createCollection(‘_yourCollectionName’);Insert query using below syntax −db.getCollection('_yourCollectionName').insertOne({"yourFieldName1":"yourValue1", "yourFieldName2":yourValue2, ............N});Let us first create a collection with documents −> db.createCollection('_testUnderscoreCollectionDemo'); { "ok" : 1 } >db.getCollection('_testUnderscoreCollectionDemo').insertOne({"StudentFirstName":"John", "StudentAge":23}); { "acknowledged" : true, "insertedId" : ObjectId("5ccfb4a6140b992277dae0e4") } >db.getCollection('_testUnderscoreCollectionDemo').insertOne({"StudentFirstName":"Carol", "StudentAge":21}); { "acknowledged" : true, "insertedId" : ObjectId("5ccfb4af140b992277dae0e5") }Following is the query to display all documents from a collection with the help of find() method −> db.getCollection('_testUnderscoreCollectionDemo').find().pretty();This will produce the following output −{ "_id" : ObjectId("5ccfb4a6140b992277dae0e4"), "StudentFirstName" : "John", "StudentAge" : 23 } { "_id" : ObjectId("5ccfb4af140b992277dae0e5"), ... Read More
Both an Exception class and an Error class are subclasses of java.lang.Throwable class, we can able to handle the exceptions at runtime but the errors we cannot handle.Exceptions are the objects representing the logical errors that occur at the run time and makes JVM enters into the state of "ambiguity".The objects which are automatically created by the JVM for representing these run time errors are known as an Exception. An Error is a subclass of Throwable class that indicates serious problems that a reasonable application should not try to catch. Most such errors are abnormal conditions.If an exception occurs we ... Read More
To set the location of component, use the GridBagConstraints. Here, we have two components −GridBagConstraints gbc = new GridBagConstraints(); JLabel label = new JLabel("Email-Id − "); JTextArea text = new JTextArea(); text.setText("Add id here...");Set the location with gridx and gridy −gbc.gridx = 0; gbc.gridy = 0; layout.setConstraints(label, gbc); panel.add(label);The following is an example to set the location of component in a GridBagLayout −Examplepackage my; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextArea; import javax.swing.WindowConstants; public class SwingDemo { public static void main(String[] args) { JFrame frame = new JFrame("Demo Frame"); ... Read More