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Articles on Trending Technologies
Technical articles with clear explanations and examples
What is Practical Use of Reversed Set Operators in Python?
Reversed set operators are operators that are defined as:s & z corresponds to s.__and__(z) z & s corresponds to s.__rand__(z)These don't make much sense in normal operations like and, add, or, etc of simple objects. However in case of inheritence, reversed operations are particularly useful when dealing with subclasses because if the right operand is a subclass of the left operand the reversed operation is attempted first. You may have different implementations in parent and child classes.These reversed operations are also used if the first operand returns NotImplemented.
Read MoreWhat is the difference between Java and Core Java?
Java is a programming language, whereas Core Java is a computing platform. Java Platform Standard Edition is Core Java, which is also called Java SE. The following are the computing following supported by Java, which also has Core Java as its part:Java SE Java Standard Edition used to develop desktop applications. A well-known implementation of Java SE is the Java Development Kit (JDK).Java EE Java Enterprise Edition i.e. Java 2 Platform, Enterprise Edition or J2EE. Java EE is used for applications running on servers. Java ME Java Micro Edition is used for applications running on mobile phones.Java SE is the Standard Edition and also ...
Read MoreWhy do we use restrict qualifier in C++?
There's no such keyword in C++. List of C++ keywords can be found in section 2.11/1 of C++ language standard. restrict is a keyword in the C99 version of C language and not in C++.In C, A restrict-qualified pointer (or reference) is basically a promise to the compiler that for the scope of the pointer, the target of the pointer will only be accessed through that pointer (and pointers copied from it).C++ compilers also support this definition for optimization purposes, but it is not a part of the official language specification.
Read MoreHow can we add a FOREIGN KEY constraint to the field of an existing MySQL table?
We can add a FOREIGN KEY constraint to a column of an existing MySQL table with the help of ALTER TABLE statement. Syntax ALTER TABLE table_name ADD FOREIGN KEY (colum_name) REFERENCES table having Primary Key(column_name); Example Suppose we want to add a FOREIGN KEY constraint on the table ‘Orders1’ referencing to the table ‘Customer’ which have column ‘Cust_Id’ as the Primary Key. It can be done with the help of the following query − mysql> Alter table orders1 add FOREIGN KEY(Cust_id) REFERENCES Customer(Cust_id); Query OK, 0 rows affected (0.21 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> ...
Read MoreWhat happens to MySQL temporary tables if MySQL session is ended?
Temporary table would be deleted if MySQL session terminates. After login again, on issuing the SELECT command we will find no data available in the database. Even our temporary table will not exist.
Read MoreThe auto storage class in C++
In C, The auto storage class specifier lets you explicitly declare a variable with automatic storage. The auto storage class is the default for variables declared inside a block. A variable x that has automatic storage is deleted when the block in which x was declared exits.You can only apply the auto storage class specifier to names of variables declared in a block or to names of function parameters. However, these names by default have automatic storage. Therefore the storage class specifier auto is usually redundant in a data declaration.It was initially carried over to C++ for syntactical compatibility only, ...
Read MoreHow do we compare String in Java
https://www.tutorialspoint.com/javaexamples/string_compare.htm
Read MoreWhat is the difference between the size of ArrayList and length of Array in Java?
ArrayList doesn't have length() method, the size() method of ArrayList provides the number of objects available in the collection.Array has length property which provides the length or capacity of the Array. It is the total space allocated during the initialization of the array.
Read MoreHow many Python classes should I put in one file?
Python code is organized in files called "modules" and groups of related modules called “packages".A module is a distinct unit that may have one or more closely-related classes. Modules need to be imported before they are read, used, maintained and extended if needed. So a module is a unit or reuse.The rule is this: a module is the unit of reuse. Everything in Python libraries and other Python applications is either a module or a package of modules.There is no limit on how many classes one can put in a file or a module. It all depends on how big ...
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