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Programming Articles
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IntStream mapToLong() method in Java
The mapToLong() function in IntStream class returns a LongStream consisting of the results of applying the given function to the elements of this stream.The syntax is as follows.LongStream mapToLong(IntToLongFunction mapper)Here, the parameter mapper is a stateless function to apply to each element.Create an IntStream with some elements in the Stream.IntStream intStream = IntStream.of(50, 100, 150, 200);Now create a LongStream and use the mapToLong() with a condition.LongStream longStream = intStream.mapToLong(num → (long)num);The following is an example to implement IntStream mapToLong() method in Java.Exampleimport java.util.*; import java.util.stream.IntStream; import java.util.stream.LongStream; public class Demo { public static void main(String[] args) { ...
Read MoreHow to create a function in a database using JDBC API?
Like procedures, you can also create function in a database and store them.SyntaxFollowing is the syntax of creating a function in a(MySQL) database:CREATE FUNCTION Function_Name(input_arguments) RETURNS output_parameter BEGIN declare variables; statements . . . . . . . . . . return data_type; ENDTo create a function in a database using JDBC API you need to:Register the driver: class using the registerDriver() method of the DriverManager class. Pass the driver class name to it, as parameter.Establish a connection: Connect ot the database using the getConnection() method of the DriverManager class. Passing ...
Read MoreHow to convert string to char array in C++?
This is a C++ program to convert string to char array in C++. This can be done in multiple different waysType1AlgorithmBegin Assign a string value to a char array variable m. Define and string variable str For i = 0 to sizeof(m) Copy character by character from m to str. Print character by character from str. EndExample#include #include using namespace std; int main() { char m[]="Tutorialspoint"; string str; int i; for(i=0;i
Read MoreC++ program to Check if a Given Binary Tree is an AVL Tree or Not
AVL tree is a self-balancing Binary Search Tree where the difference between heights of left and right subtrees cannot be more than one for all nodes.This is a C++ program to check if a given Binary Tree is an AVL Tree or not.AlgorithmBegin function AVL() returns true if the given tree is AVL otherwise false. if(root == NULL) return 1 leftheight = height(root->left) rightheight = height(root->right) if(abs(leftheight-rightheight) left) && AVL(root->right)) return 1 return 0 EndExample#include using namespace std; class nod { //node declaration public: int data; ...
Read MoreWhy C++ does not have a virtual constructor?
The virtual mechanism works only when we have a base class pointer to a derived class object.In C++, constructor cannot be virtual, because when constructor of a class is executed there is no virtual table in the memory, means no virtual pointer defined yet. So, the constructor should always be non-virtual.But virtual destructor is possible. Here is an exampleExample#include using namespace std; class b { public: b() { cout
Read MoreHow to generate different random numbers in a loop in C++?
Let us see how to generate different random numbers using C++. Here we are generating random numbers in range 0 to some value. (In this program the max value is 100).To perform this operation we are using the srand() function. This is in the C++ library. The function void srand(unsigned int seed) seeds the random number generator used by the function rand.The declaration of srand() is like below −void srand(unsigned int seed)It takes a parameter called seed. This is an integer value to be used as seed by the pseudo-random number generator algorithm. This function returns nothing.To get the number ...
Read MoreHow are virtual functions implemented in C++?
Virtual functions in C++ used to create a list of base class pointers and call methods of any of the derived classes without even knowing kind of derived class object. Virtual functions are resolved late, at runtime.Here is an implementation of virtual function in C++ program −Example#include using namespace std; class B { public: virtual void s() { //virtual function cout
Read MoreJava Tuple setAt0() method for Unit class
The setAt0() method is used to set the Unit value in JavaTuples and a copy with a new value at index 0.Let us first see what we need to work with JavaTuples. To work with the Unit class in JavaTuples, you need to import the following package −import org.javatuples.Unit;Note − Steps to download and run JavaTuples program. If you are using Eclipse IDE to run Unit Class in Java Tuples, then Right Click Project ->Properties ->Java Build Path ->Add External Jars and upload the downloaded JavaTuples jar file.The following is an example −Exampleimport org.javatuples.Unit; public class Demo { public static void main(String[] ...
Read MoreC++ Program to Implement Direct Addressing Tables
This is a C++ program to implement Direct Addressing Tables. Direct Addressing Tables are used when each element has a key drawn from a universal set S = {0, 1, . . . ,n − 1} where n isn’t too large and each key is unique. It facilitates fast insertion, searching and deletion operations.Functions and pseudocodesBegin insert(): Take the table variables word and key as argument. T[ x.key ] = x, where x is a value of key. delete(): Take the table variables word and key as argument. ...
Read MoreGet a value from Unit Tuple class in Java
Use the getValueX() method to get a value from Unit Tuple class in Java at a particular index. For example, getValue0().Let us first see what we need to work with JavaTuples. To work with the Unit class in JavaTuples, you need to import the following package −import org.javatuples.Unit;Note − Steps to download and run JavaTuples program If you are using Eclipse IDE to run Unit Class in Java Tuples, then Right Click Project -> Properties -> Java Build Path -> Add External Jars and upload the downloaded JavaTuples jar file.The following is an example −Exampleimport org.javatuples.Unit; public class Demo { public ...
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