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The flow of program control is specified by control statements in C#. It includes the following −if statementAn if statement consists of a boolean expression followed by one or more statements.The following is the syntax −if(boolean_expression) { /* statement(s) will execute if the boolean expression is true */ }if-else statementAn if statement can be followed by an optional else statement, which executes when the boolean expression is false.The following is the syntax −if(boolean_expression) { /* statement(s) will execute if the boolean expression is true */ } else { /* statement(s) will execute if the boolean expression is ... Read More
Factorial of a number is what we are finding using a recursive function checkFact () in the below example −If the value is 1, it returns 1 since Factorial is 1 −if (n == 1) return 1;If not, then the recursive function will be called for the following iterations if you want the value of 5!Interation1: 5 * checkFact (5 - 1); Interation2: 4 * checkFact (4 - 1); Interation3: 3 * checkFact (3 - 1); Interation4: 4 * checkFact (2 - 1);To calculate a factorial using recursion, you can try to run the following code which ... Read More
The "as" operator perform conversions between compatible types. It is like a cast operation and it performs only reference conversions, nullable conversions, and boxing conversions. The as operator can't perform other conversions, such as user-defined conversions, which should instead be performed by using cast expressions.The following is an example showing the usage of as operation in C#. Here ‘as’ is used for conversion:string s = obj[i] as string;Try to run the following code to work with ‘as’ operator in C# −Example Live Demousing System; public class Demo { public static void Main() { object[] obj = ... Read More
The "is" operator in C# checks whether the run-time type of an object is compatible with a given type or not.The following is the syntax −expr is typeHere, expr is the expression and type is the name of the typeThe following is an example showing the usage of is operator in C# −Example Live Demousing System; class One { } class Two { } public class Demo { public static void Test(object obj) { One x; Two y; if (obj is One) { Console.WriteLine("Class One"); ... Read More
To check if a number is divisible by2 or not, you need to first find the remainder.If the remainder of the number when it is divided by 2 is 0, then it would be divisible by 2.Let’s say our number is 10, we will check it using the following if-else −// checking if the number is divisible by 2 or not if (num % 2 == 0) { Console.WriteLine("Divisible by 2 "); } else { Console.WriteLine("Not divisible by 2"); }The following is an example to find whether the number is divisible by 2 or not −Example Live Demousing System; ... Read More
Database SecurityDatabase security has many different layers, but the key aspects are:AuthenticationUser authentication is to make sure that the person accessing the database is who he claims to be. Authentication can be done at the operating system level or even the database level itself. Many authentication systems such as retina scanners or bio-metrics are used to make sure unauthorized people cannot access the database.AuthorizationAuthorization is a privilege provided by the Database Administer. Users of the database can only view the contents they are authorized to view. The rest of the database is out of bounds to them.The different permissions for ... Read More
A centralized database is stored at a single location such as a mainframe computer. It is maintained and modified from that location only and usually accessed using an internet connection such as a LAN or WAN. The centralized database is used by organisations such as colleges, companies, banks etc.As can be seen from the above diagram, all the information for the organisation is stored in a single database. This database is known as the centralized database.AdvantagesSome advantages of Centralized Database Management System are −The data integrity is maximised as the whole database is stored at a single physical location. This ... Read More
A relationship is an important part of any Entity relationship diagram as it shows the relation between two different entities. In an n - ary relationship, the n shows the number of entities in the relationship. It can be anything but the most popular relationships are unary, binary and ternary where the number of entities respectively are one, two and three.More information about Unary, Binary and Ternary relationships is as follows −Unary RelationshipWhen there is a relationship between two entities of the same type, it is known as a unary or recursive relationship. This means that the relationship is between ... Read More
process Burst time A 4 B 1 C 8 D 1time slice=10 unitA B C D A C C C 0 2 3 5 6 8 10 12 14So A will complete 8 cycles.
The different types of functions in Oracle are −Oracle String FunctionsOracle Numeric FunctionsOracle Date FunctionsMore details about these functions are given as follows −Oracle String FunctionsThe following are the Oracle String Functions −ASCII(str)This function returns the ASCII or numeric value of the first word in the string str provided. If it is an empty string, it returns 0. For example:SQL> SELECT ASCII('Apple'); +---------------------------------------------------------+ | ASCII('Apple') | +---------------------------------------------------------+ | 65 | +---------------------------------------------------------+ 1 row in set (0.00 sec)This returns the ASCII value of A i.e. 65 as it is the first character in the string.CONCAT(str1, str2…..strn)This function returns the string that ... Read More