Use the $slice operator. Let us first create a collection with documents −> db.limitAndSliceProjectionDemo.insertOne(    {       "_id" : 101,       "UserName" : "Carol",       "UserAge" : 26,       "UserMesssage" : [          "Hi",          "Hello", ... Read More

Here we will see how to compile multiple cpp file in C++ program. The task is very simple. We can provide the names as a list to the g++ compiler to compile them into one executable fileTo compile multiple files like abc.cpp, and xyz.cpp at once, the syntax will be ... Read More

In this section, we will see how to check whether a given character is number, or the alphabet or some special character in C.The alphabets are from A – Z and a – z, Then the numbers are from 0 – 9. And all other characters are special characters. So ... Read More

In C++ and Java, there are the concept of Inheritance. The inheritance properties are used to reuse the code and also make a relationship between two objects. Here we will see some basic differences between inheritance in C++ and inheritance in Java.In Java, all of the classes are extending the ... Read More

You can use below syntax for inserting an 8-byte integer in MongoDB through JavaScript shell −anyVariableName= {"yourFieldName" : new NumberLong("yourValue")};To display the above variable, you can use the variable name or printjson(). Following is the query to insert 8 byte integer in MongoDB −> userDetail = {"userId" : new NumberLong("98686869")}; ... Read More

To change header background color, at first get the header background −JTableHeader tableHeader = table.getTableHeader();Now, set the background color using set Background() −tableHeader.setBackground(Color.black);Above, we have used the Color class to set the color.The following is an example to change the header background color of a JTable −Examplepackage my; import java.awt.Color; ... Read More

If you insert records into a table which contains auto-incremented column, using a Statement or, PreparedStatement objects.You can retrieve the values of that particular column, generated by them object using the getGeneratedKeys() method.ExampleLet us create a table with name sales in MySQL database, with one of the columns as auto-incremented, using ... Read More

In Java or C#, we can use final classes. The final classes are special type of class. We cannot extend that class to create another class. In C++ there are no such direct way. Here we will see how to simulate the final class in C++.Here we will create one ... Read More

Let’s say both the numbers are 50 and 60. You can use below syntax −db.yourCollectionName.find({yourFieldName: { $gt : 50 , $lt : 60 } } );If you want to include 50 and 60 also then use below syntax −db.yourCollectionName.find({yourFieldName: { $gte : 50 , $lte : 60 } } );Let ... Read More

Here we will see what are the differences for set, multiset, unordered_set and unordered_multiset in C++. Let us see the properties of them using some example.SetThe properties of set are like belowStores data in sorted orderStores only unique valuesWe can insert or delete data, but cannot change the dataWe can ... Read More