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Here we will see what are the __FILE, __LINE__ and __FUNCTION__ in C++.The __FILE__This macro is used to get the path of the current file. This is useful when we want to generate log files. The following code will explain its functionality.Example#include using namespace std; int errorLog (const char* file, const std::string& msg){ cerr
Reading from the StackLet us consider that SP contents the address FC78H, and we want to read information from a stack location. In this case, we are not interested in reading from a location whose address is less than the memory address present in SP. This is because 8085 interprets them as useless information. For example, there is no point in reading useless information from memory location FC75H.SP interprets that, memory locations FC78H, FC79H, ..., FFFFH are all interpreted by 8085 to have useful information. To read from Stack, the instruction is POP in 8085 microprocessor instruction set. Here we ... Read More
Before getting into the example, we should know what checktextview in android is. Check textview is expanded by textview and contains checkable interface. Using Checktextview we can find that, whether a user is clicked on textview or not.This example demonstrate about How to use checktextview 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 taken CheckedTextView, when user clicked on textview, it will ... Read More
Let us first create a table. The query to create a table is as followsmysql> create table FirstAndLastDataDemo -> ( -> EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> EmployeeName varchar(20), -> EmployeeAge int -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command. The query is as followsmysql> insert into FirstAndLastDataDemo(EmployeeName, EmployeeAge) values('John', 23); Query OK, 1 row affected (0.15 sec) mysql> insert into FirstAndLastDataDemo(EmployeeName, EmployeeAge) values('Bob', 13); Query OK, 1 row affected (0.11 sec) mysql> insert into FirstAndLastDataDemo(EmployeeName, EmployeeAge) values('Larry', 24); Query OK, 1 row affected ... Read More
The tag is a commonly used tag because it iterates over a collection of objects. The tag is used to break a string into tokens and iterate through each of the tokens.AttributeThe tag has the following attributes −AttributeDescriptionRequiredDefaultitemsInformation to loop overNoNonebeginElement to start with (0 = first item, 1 = second item, ...)No0endElement to end with (0 = first item, 1 = second item, ...)NoLast elementstepProcess every step itemsNo1varName of the variable to expose the current itemNoNonevarStatusName of the variable to expose the loop statusNoNoneExample for Tag Example Item The above code will generate the following result −Item 1 Item 2 Item 3 Item 4 Item 5
The LocalDate instance can be obtained from a string value using the parse() method in the LocalDate class in Java. This method requires a single parameter i.e. the string which is to be parsed. This string cannot be null. Also, it returns the LocalDate instance obtained from the string value that was passed as a parameter.A program that demonstrates this is given as follows −Example Live Demoimport java.time.*; public class Demo { public static void main(String[] args) { LocalDate ld = LocalDate.parse("2019-02-15"); System.out.println("The LocalDate is: " ... Read More
It can be checked if the days, months and years in the Period are negative or not using the isNegative() method in the Period class in Java. This method requires no parameters. Also, it returns true if any of the days, months and years in the Period are negative and false if all of the days, months and years in the Period are positive.A program that demonstrates this is given as followsExample Live Demoimport java.time.Period; public class Demo { public static void main(String[] args) { String period = "P5Y9M4D"; Period p = Period.parse(period); ... Read More
To find value in the array with multiple criteria, for example, you can use $elemMatch along with $gt and $lt. The syntax is as follows −db.yourCollectionName.find({yourFieldName:{$elemMatch:{$gt:yourNegativeValue, $lt:yourPo sitiveValue}}}).pretty();To understand the above syntax, let us create a collection with the document. The query to create a collection with a document is as follows −> db.findValueInArrayWithMultipleCriteriaDemo.insertOne({"StudentName":"Larry", "StudentMarks":[-150, 150]}); { "acknowledged" : true, "insertedId" : ObjectId("5c77daf6fc4e719b197a12f5") } > db.findValueInArrayWithMultipleCriteriaDemo.insertOne({"StudentName":"Mike", "StudentMarks":[19]}); { "acknowledged" : true, "insertedId" : ObjectId("5c77db09fc4e719b197a12f6") }Display all documents from a collection with the help of find() method. The query is as follows −> db.findValueInArrayWithMultipleCriteriaDemo.find().pretty();The following is the ... Read More
You can use UPDATE command for this.The syntax is as followsupdate yourTableName set yourColumnName =yourColumnName +yourIntegerValue where ;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table addANumberToCurrentValueDemo -> ( -> Game_Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Game_Score int -> ); Query OK, 0 rows affected (0.67 sec)Now you can insert some records in the table using insert command. The query is as follows −mysql> insert into addANumberToCurrentValueDemo(Game_Score) values(1090); Query OK, 1 row affected (0.30 sec) mysql> insert into addANumberToCurrentValueDemo(Game_Score) values(204); Query OK, ... Read More
An expression tree is basically a binary tree which is used to represent expressions. In expression tree, nodes correspond to the operator and each leaf node corresponds to the operand. This is a C++ program to construct an expression tree for a postfix Expression in inorder, preorder and postorder traversals.AlgorithmBegin Function r() has a character variable as parameter. If the characters are + or - or * or / then Return will be -1 If the characters are from A to Z then Return will ... Read More