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Articles by Chandu yadav
Page 56 of 81
8085 Program to do an operation on two numbers based on the contents of X
Now let us see a program of Intel 8085 Microprocessor. In this program we will see how to do different operations based on choice.Problem Statement:Write 8085 Assembly language program to perform some operations on two 8-bit binary numbers base on choice.Discussion:In this program we are taking a choice. The choice value is stored at memory location 8000H (named as X). And the numbers are stored at location 8001H and 8002H. We are storing the result at location 8050H and 8051H.Here if the choice is 00H, then it will perform addition, for 01H, it will perform subtraction, and for 02H, it ...
Read MoreHow to find edit text values start from consonant or not?
This example demonstrate about How to find edit text values start from consonant or not.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. In the above code, we have taken edit text and button view to verify edit text data is starting with a consonant.Step 3− Add the following code to java/MainActivity.xmlpackage com.example.myapplication; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends AppCompatActivity ...
Read MoreMongoDB query which represents not equal to null or empty?
To set a query for not equal to null or empty, use the $nin operator. The syntax is as followsdb.yourCollectionName.find({yourFieldName:{$nin:[null, ""]}});Let us create a collection with documents> db.notEqualToNullOrEmptyDemo.insertOne({"UserName":"Larry", "UserAge":24}); { "acknowledged" : true, "insertedId" : ObjectId("5c9d20b6a629b87623db1b26") } > db.notEqualToNullOrEmptyDemo.insertOne({"UserName":"", "UserAge":29}); { "acknowledged" : true, "insertedId" : ObjectId("5c9d20bea629b87623db1b27") } > db.notEqualToNullOrEmptyDemo.insertOne({"UserName":"Sam", "UserAge":32}); { "acknowledged" : true, "insertedId" : ObjectId("5c9d20c7a629b87623db1b28") } > db.notEqualToNullOrEmptyDemo.insertOne({"UserName":null, "UserAge":27}); { "acknowledged" : true, "insertedId" : ObjectId("5c9d20d2a629b87623db1b29") } > db.notEqualToNullOrEmptyDemo.insertOne({"UserName":"Robert", "UserAge":26}); { "acknowledged" : true, "insertedId" : ObjectId("5c9d20dda629b87623db1b2a") } > db.notEqualToNullOrEmptyDemo.insertOne({"UserName":"", "UserAge":23}); { "acknowledged" : true, ...
Read MoreMySQL replication: temporarily prevent specific SQL statements replicating to the slaves?
To achieve this, you need to set sql_log_bin to 0. To understand the concept, let us create a table. The query to create a table is as followsmysql> create table SQLStatementsDemo -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserName varchar(20) -> ); Query OK, 0 rows affected (0.79 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into SQLStatementsDemo(UserName) values('John'); Query OK, 1 row affected (0.18 sec) mysql> insert into SQLStatementsDemo(UserName) values('Carol'); Query OK, 1 row affected (0.14 sec) mysql> insert into SQLStatementsDemo(UserName) values('Bob'); Query ...
Read MoreMongoDB equivalent of SELECT field AS `anothername`?
In MySQL, we give an alias name for a column. Similarly, you can give an alias name for field name in MongoDB. The MongoDB equivalent syntax is as followsdb.yourCollectionName.aggregate( [ { "$project": { "_id": 0, "anyAliasName": "$yourFieldName" }} ]);Let us first create a collection with documents> db.selectFieldAsAnotherNameDemo.insertOne({"Name":"Larry"}); { "acknowledged" : true, "insertedId" : ObjectId("5c9d448827b86948e204ca91") } > db.selectFieldAsAnotherNameDemo.insertOne({"Name":"Robert"}); { "acknowledged" : true, "insertedId" : ObjectId("5c9d449027b86948e204ca92") } > db.selectFieldAsAnotherNameDemo.insertOne({"Name":"Sam"}); { "acknowledged" : true, "insertedId" : ObjectId("5c9d449527b86948e204ca93") } > db.selectFieldAsAnotherNameDemo.insertOne({"Name":"Mike"}); { "acknowledged" : true, "insertedId" : ObjectId("5c9d449927b86948e204ca94") ...
Read MoreWhich methods can be used to read HTTP header in your JSP program.
The request object provides methods to get HTTP header information including form data, cookies, HTTP methods, etc.Following table lists out the important methods that can be used to read HTTP header in your JSP program. These methods are available with HttpServletRequest object which represents client request to webserver.Sr.No.Method & Description1Cookie[] getCookies()Returns an array containing all of the Cookie objects the client sent with this request.2Enumeration getAttributeNames()Returns an Enumeration containing the names of the attributes available to this request.3Enumeration getHeaderNames()Returns an enumeration of all the header names this request contains.4Enumeration getParameterNames()Returns an enumeration of String objects containing the names of the ...
Read MoreGet MongoDB Databases in a JavaScript Array?
To get MongoDB databases in a JavaScript array, you can use runCommand(). Following is the query to get MongoDB databases in a JavaScript array> use admin; switched to db admin > allDatabasesDetails = db.runCommand({listDatabases: 1});This will produce the following output{ "databases" : [ { "name" : "admin", "sizeOnDisk" : 847872, "empty" : false }, { "name" : "config", "sizeOnDisk" : 98304, "empty" : false ...
Read MoreCheck if MongoDB database exists?
There are two possibilities to check if MongoDB database exists.Case 1: The first possibility is that the MongoDB database exists i.e. it returns particular index.Case 2: The second possibility is that the MongoDB database does not exist i.e. it returns index -1.NOTE: An index starts from 0 and ends with (N-1) like an array.The syntax is as follows to check if MongoDB database exists.db.getMongo().getDBNames().indexOf("yourDatabaseName");Case 1: Let us implement the above syntax to check if MongoDB database exists. Following is the querydb.getMongo().getDBNames().indexOf("test");This will produce the following output6Look at the above sample output, we are getting 6 that means the database “test” ...
Read MoreHow do I use the conditional operator in C/C++?
This conditional operator is also known as the Ternary Operator. This operator has three phase.Exp1 ? Exp2 : Exp3;where Exp1, Exp2, and Exp3 are expressions. Notice the use and placement of the colon. The value of a ? expression is determined like this: Exp1 is evaluated. If it is true, then Exp2 is evaluated and becomes the value of the entire ? expression. If Exp1 is false, then Exp3 is evaluated and its value becomes the value of the expression.The ? is called a ternary operator because it requires three operands and can be used to replace if-else statements, which ...
Read MoreExample on ToggleButton?
Before getting into example, we should know what is togglebutton in android, Toggle button is extended view of Button view. It going to represent of state of button as checked and unchecked. Here is the simple solution about toggle button 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. In the above code we have added toggle button, when user click on toggle button it going to change the state.Step 3 ...
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