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Program comments are explanatory statements that you can include in the C++ code. These comments help anyone reading the source code. All programming languages allow for some form of comments.C++ supports single-line and multi-line comments. All characters available inside any comment are ignored by C++ compiler.Single line commentsTo create a single line comment, we use the // notation. Wherever you want to start the comment, start it with //. For example,// This is a comment cout
A fundamental or primitive type is a data type where the values that it can represent have a very simple nature (a number, a character or a truth-value); the primitive types are the most basic building blocks for any programming language and are the base for more complex data types.C++ has the following primitive data types −S.NoTypeDescription1boolStores either value true or false.2charTypically a single octet (one byte). This is an integer type.3intThe most natural size of an integer for the machine.4floatA single-precision floating point value.5doubleA double-precision floating point value.6voidRepresents the absence of type.Read More
The single operators operate on one quantity and following are the samples of single operators − - The increment ( ) and decrement (--) operators. The compiler distinguishes between the different meanings of an operator by examining the types of its operands.The unary operators operate on a single operand and following are the examples of Unary operators −The increment (++) and decrement (--) operators.The unary minus (-) operator.The logical not (!) operator.The unary operators operate on the object for which they were called and normally, this operator appears on the left side of the object, as in !obj, -obj, and ... Read More
The EXIT or QUIT commands take you returned to windows from MySQL command line tool.mysql> EXITORmysql> QUIT
After running a query, MySQL returns the number of rows and gives time in the output that shows how much it took for running that query. As for example, if we run the following querymysql> create table e1(id int); Query OK, 0 rows affected (0.23 sec)It is showing the time (0.23 sec).
Unary operator are operators that act upon a single operand to produce a new value. The unary operators are as follows −Indirection operator (*) - It operates on a pointer variable, and returns an l-value equivalent to the value at the pointer address. This is called "dereferencing" the pointer.Address-of operator (&) - The unary address-of operator (&) takes the address of its operand. The operand of the address-of operator can be either a function designator or an l-value that designates an object that is not a bit field and is not declared with the register storage-class specifier.Unary plus operator (+) - ... Read More
The :: (scope resolution) operator is used to get hidden names due to variable scopes so that you can still use them. The scope resolution operator can be used as both unary and binary.You can use the unary scope operator if a namespace scope or global scope name is hidden by an explicit declaration of the same name in a block or class. For example, if you have a global variable of name my_var and a local variable of name my_var, to access global my_var, you'll need to use the scope resolution operator. For example, Example#include using namespace ... Read More
The :: (scope resolution) operator is used to get hidden names due to variable scopes so that you can still use them. The scope resolution operator can be used as both unary and binaryYou can use the single scope operator if a namespace scope or global scope name is hidden by a certain declaration of a similar name during a block or class. For example, if you have a global variable of name my_var and a local variable of name my_var, to access global my_var, you'll need to use the scope resolution operator. For example, Example#include using namespace ... Read More
As we know that if no comparison or condition is true then CASE statement returns the result specified after ELSE statement. But what if there is no ELSE statement, then in this situation, CASE statement would return NULL. Following is an example to demonstrate it.Examplemysql> Select CASE 100 -> WHEN 150 THEN 'It is matched' -> WHEN 200 THEN 'It is not matched' -> END As 'It Returns NULL'; +-----------------+ | It Returns NULL | +-----------------+ | NULL | +-----------------+ 1 row in set (0.00 sec)The query below, using the data from ... Read More
You would require to change the connection.properties file of your local Tomcat Server (Server > Java Web Tomcat 8 Server-config/config_master/connection_data), to point to the HANA database.Here are the usual parameters that need to be configured for HANA databasejavax.persistence.jdbc.driver=com.sap.db.jdbc.Driver javax.persistence.jdbc.url=jdbc:sap://:/?reconnect=true&autocommit=false javax.persistence.jdbc.user=db-user javax.persistence.jdbc.password=db-pass eclipselink.target-database=HANA