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In this section we will see what is the purpose of memset() function in C++. This function converts the value of a character to unsigned character and copies it into each of first n character of the object pointed by the given str[]. If the n is larger than string size, it will be undefined.The syntax of the memset() functionvoid* memset( void* str, int c, size_t n);In this example will use one string, then convert each character to some other character up to length n.Example Live Demo#include using namespace std; int main() { char str[] = "Hello World"; memset(str, ... Read More
Here is a C++ Program to Perform Greedy ColoringAlgorithm:Begin Take the number of vertices and edges as input. Create function greedyColoring() to assign color to vertices: A) Assign the first color to first vertex. B) Initialize the remaining vertices. C) Declare a temporary array to store the available colors. D) Assign color to the remaining vertices. Print the solution. EndExample Code#include #include using namespace std; int n,e,i,j; vector g; vector col; bool visit[1001]; void greedyColoring() { col[0] = 0; for (i=1;i
To remove _id from MongoDB result, you need to set 0 for _id field. Following is the syntaxdb.yourCollectionName.find({}, {_id:0});To understand it, let us create a collection with documents. Following is the query> db.removeIdDemo.insertOne({"UserName":"John", "UserAge":23}); { "acknowledged" : true, "insertedId" : ObjectId("5c9bb4042d66697741252440") } > db.removeIdDemo.insertOne({"UserName":"Mike", "UserAge":27}); { "acknowledged" : true, "insertedId" : ObjectId("5c9bb40c2d66697741252441") } > db.removeIdDemo.insertOne({"UserName":"Sam", "UserAge":34}); { "acknowledged" : true, "insertedId" : ObjectId("5c9bb4162d66697741252442") } > db.removeIdDemo.insertOne({"UserName":"Carol", "UserAge":29}); { "acknowledged" : true, "insertedId" : ObjectId("5c9bb4222d66697741252443") }Following is the query to display all documents from a collection with the help of find() method> db.removeIdDemo.find().pretty();This ... Read More
To generate two separate outputs, at first create a new Random object −private static final Random r = new Random();Now, let us declare a value −int val = 5;Loop from the value till 100 and generate random numbers between 1 to 100 −while (val
Here we will see how to define a macro called PRINT(x), and this will print whatever the value of x, passed as an argument.To solve this problem, we will use the stringize operator. Using this operator the x is converted into string, then by calling the printf() function internally, the value of x will be printed. Let us see the example to get the better idea.Example#include #define PRINT(x) printf(#x) int main () { PRINT(Hello); printf(""); PRINT(26); printf(""); PRINT(2.354721); printf(""); }OutputHello 26 2.354721
Singleton design pattern is a software design principle that is used to restrict the instantiation of a class to one object. This is useful when exactly one object is needed to coordinate actions across the system. For example, if you are using a logger, that writes logs to a file, you can use a singleton class to create such a logger. You can create a singleton class using the following code.Example#include using namespace std; class Singleton { static Singleton *instance; int data; // Private constructor so that no objects can be created. Singleton() { ... Read More
We use Timing and Controlling unit in 8085 for the generation of timing signals and the signals to control. All the operations and functions both interior and exterior of a microprocessor are controlled by this unit. X2 and CLK output pins: To do or rather perform the operations of timing in the microcomputer system, we have a generator called clock generator in the CU of 8085. Other than the quartz crystal the complete circuit of the oscillator is within the chip. The two pins namely X1 and X2 are taken out from the chip to give the connection to the ... Read More
To add a value to the Quartet Tuple, use the addAtX() method. The index can be set here with the X i.e. the place where the value gets added.Let us first see what we need to work with JavaTuples. To work with Quartet class in JavaTuples, you need to import the following package −import org.javatuples.Quartet;We will use Quintet class; therefore, we will import the following package −import org.javatuples.Quintet;Note − Steps to download and run JavaTuples program If you are using Eclipse IDE to run Quartet Class in JavaTuples, then Right Click Project → Properties → Java Build Path → Add ... Read More
The web server needs a JSP engine, i.e, a container to process JSP pages. The JSP container is responsible for intercepting requests for JSP pages. This tutorial makes use of Apache which has built-in JSP container to support JSP pages development.A JSP container works with the Web server to provide the runtime environment and other services a JSP needs. It knows how to understand the special elements that are part of JSPs.Following diagram shows the position of JSP container and JSP files in a Web application.JSP ProcessingThe following steps explain how the web server creates the Webpage using JSP −As ... Read More
An immutable copy of a LocalDate with the year altered as required is done using the method withYear() in the LocalDate class in Java. This method requires a single parameter i.e. the year that is to be set in the LocalDate and it returns the LocalDate with the year altered as required.A program that demonstrates this is given as follows −Example Live Demoimport java.time.*; public class Main { public static void main(String[] args) { LocalDate ld1 = LocalDate.parse("2019-02-15"); System.out.println("The LocalDate is: " + ld1); ... Read More