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Articles by Anvi Jain
Page 11 of 43
How to create a Borderless Window in Java?
To create a borderless window in Java, do not decorate the window. The following is an example to create a BorderLess Window −Examplepackage my; import java.awt.GraphicsEnvironment; import java.awt.GridLayout; import java.awt.Point; import javax.swing.JLabel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.JWindow; import javax.swing.SwingConstants; public class SwingDemo { public static void main(String[] args) throws Exception { JWindow frame = new JWindow(); JLabel label1, label2, label3; frame.setLayout(new GridLayout(2, 2)); label1 = new JLabel("Id", SwingConstants.CENTER); label2 = new JLabel("Age", SwingConstants.CENTER); label3 = new JLabel("Password", SwingConstants.CENTER); ...
Read MoreWrite a program that produces different results in C and C++
Here we will see some program that will return different results if they are compiled in C or C++ compilers. We can find many such programs, but here we are discussing about some of them.In C and C++, the character literals are treated as different manner. In C, they are treated as int but in C++, they are treated as characters. So if we check the size using sizeof() operator, it will return 4 in C, and 1 in C++.Live Demo For C.Example Live Demo#include int main() { printf("The character: %c, size(%d)", 'a', sizeof('a')); }Output(C)The character: a, size(4)Live Demo For ...
Read MoreC++ Program to Implement Treap
This is a C++ program to implement Treap. Treap data structure is basically a randomized binary search tree. Here, we shall consider insert, delete and search operations on this.Functions and descriptionsfunction rotLeft() for left rotationFirst rotate the tree then set new root.function rotRight() for right rotationFirst rotate the tree then set new root.function insetNod() to insert a given key into treap with priority recursively −If root = nullptr return data as root. If given data is less then root node, Insert data in left subtree. Rotate left if heap property violated. else Insert data in right ...
Read MoreModulus of two float or double numbers using C
Here we will see how to get the modulus of two floating or double type data in C. The modulus is basically finding the remainder. For this, we can use the remainder() function in C. The remainder() function is used to compute the floating point remainder of numerator/denominator.So the remainder(x, y) will be like below.remainder(x, y) = x – rquote * yThe rquote is the value of x/y. This is rounded towards the nearest integral value. This function takes two arguments of type double, float, long double, and returns the remainder of the same type, that was given as argument. ...
Read MoreCheck if value exists for a field in a MongoDB document?
To check if value exists for a field in a MongoDB document, you can use find() along with $exists operator. Let us first create a collection with documents −> db.checkIfValueDemo.insertOne({"PlayerName":"John Smith", "PlayerScores":[5000, 98595858, 554343]}); { "acknowledged" : true, "insertedId" : ObjectId("5cc6f507af8e7a4ca6b2ad98") } > db.checkIfValueDemo.insertOne({"PlayerName":"John Doe", "PlayerScores":[]}); { "acknowledged" : true, "insertedId" : ObjectId("5cc6f512af8e7a4ca6b2ad99") } > db.checkIfValueDemo.insertOne({"PlayerName":"Carol Taylor", "PlayerScores":[7848474, 8746345353]}); { "acknowledged" : true, "insertedId" : ObjectId("5cc6f521af8e7a4ca6b2ad9a") } > db.checkIfValueDemo.insertOne({"PlayerName":"David Miller", "PlayerScores":[]}); { "acknowledged" : true, "insertedId" : ObjectId("5cc6f531af8e7a4ca6b2ad9b") }Following is the query to display all documents from a collection with the help ...
Read MoreRegex to ignore a specific character in MongoDB?
You can use regular expression along with $not operator to ignore a specific character and display rest of them. Let us first create a collection with documents −> db.regexDemo.insertOne({"CustomerId":"Customer#1234", "CustomerName":"Chris"}); { "acknowledged" : true, "insertedId" : ObjectId("5cc7428f8f9e6ff3eb0ce436") } > db.regexDemo.insertOne({"CustomerId":"Customer5678", "CustomerName":"Robert"}); { "acknowledged" : true, "insertedId" : ObjectId("5cc7429e8f9e6ff3eb0ce437") } > db.regexDemo.insertOne({"CustomerId":"Customer#777", "CustomerName":"Carol"}); { "acknowledged" : true, "insertedId" : ObjectId("5cc742ae8f9e6ff3eb0ce438") } > db.regexDemo.insertOne({"CustomerId":"Customer777", "CustomerName":"David"}); { "acknowledged" : true, "insertedId" : ObjectId("5cc742bc8f9e6ff3eb0ce439") }Following is the query to display all documents from a collection with the help of find() method −> db.regexDemo.find().pretty();This will produce the ...
Read MoreHow to add a field with static value to MongoDB find query?
You can use $literal operator along with aggregate framework. Let us first create a collection with documents −> db.fieldWithStaticValue.insertOne({"Name":"Larry", "Age":24}); { "acknowledged" : true, "insertedId" : ObjectId("5cd6554c7924bb85b3f48948") } > db.fieldWithStaticValue.insertOne({"Name":"Chris", "Age":23}); { "acknowledged" : true, "insertedId" : ObjectId("5cd655567924bb85b3f48949") } > db.fieldWithStaticValue.insertOne({"Name":"David", "Age":26}); { "acknowledged" : true, "insertedId" : ObjectId("5cd655607924bb85b3f4894a") }Following is the query to display all documents from a collection with the help of find() method −> db.fieldWithStaticValue.find();This will produce the following output −{ "_id" : ObjectId("5cd6554c7924bb85b3f48948"), "Name" : "Larry", "Age" : 24 } { "_id" : ObjectId("5cd655567924bb85b3f48949"), "Name" : "Chris", "Age" : 23 ...
Read MoreCan I get the node at a specified index in a JTree with Java?
To get the node at a specified index in a JTree, use the getChildAt() method. Here, we are finding the node at index 3 i.e. 4th node −node.getChildAt(3)The following is an example to get the node at a specified index in a JTree −Examplepackage my; import javax.swing.JFrame; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame("Demo"); DefaultMutableTreeNode node = new DefaultMutableTreeNode("Products"); DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Clothing (Product1 - P66778)"); DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Accessories (Product2 ...
Read MoreHow do I push elements to an existing array in MongoDB?
To push elements to an existing array, use $addToSet operator along with update(). Let us first create a collection with documents −> db.pushElements.insertOne({"Comments":["Good", "Awesome", "Nice"]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd682597924bb85b3f48953") }Following is the query to display all documents from a collection with the help of find() method −> db.pushElements.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cd682597924bb85b3f48953"), "Comments" : [ "Good", "Awesome", "Nice" ] }Following is the query to push elements to an existing array in MongoDB −> db.pushElements.update( {_id:ObjectId("5cd682597924bb85b3f48953")}, { ...
Read MoreShuffle vs random_shuffle in C++
Here we will see the Shuffle and random_shuffle in C++. Let us see the random_shuffle first. It is used to randomly rearrange the elements in range [left, right). This function randomly swaps the positions of each element with the position of some randomly chosen positions.We can provide some random generator function to tell which element will be taken in every case. If we do not provide some, it will use its own random generator function.Example Live Demo#include using namespace std; int myRandomGenerator(int j) { return rand() % j; } main() { srand(unsigned(time(0))); vector arr; for (int ...
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