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Programming Articles
Page 1636 of 2547
How to use List size() method in Java With Examples?
In Java, a List is an interface which stores a sequence of elements of similar types. Since the list contains multiple elements, we might need to know how many element the list currently have. To count the total number of elements present in a list, the List interface provides a method named size(). The List size() Method The size() method of List interface is used to retrieve size of the current List. The size refers to total number of items currently the list holds. For example, a list have {1, 2, 3}, then the size of the list will be ...
Read MoreHow To Calculate Volume of Prism in Java?
A Prism refers to a three-dimensional solid object which has two identical ends. A prism has two faces, which are: Top and Bottom face. Lateral face Both top and bottom faces are called bases which are identical to each other. All lateral faces are also identical to each other which belong to the class of parallelograms. When the base of the prism is triangular in shape that prism is called a Triangular prism. Similarly, when the base of a prism is rectangular in shape it is called a Rectangular prism. ...
Read MoreCan we override a start() method in Java?
Yes! we can override the start() method of the Thread class in Java. But, if we do so, we must call it using super.start(), which will create a new thread; otherwise, no new thread will be created, and the run() method will not execute in parallel for the other threads. Overriding the start() Method In Java, the start() method is used to begin (start) the execution of a new Thread. When this method is called, it invokes the run() method, which executes in parallel with other threads. Example In the following example, we override the start() method within the subclass of ...
Read MoreC++ Program to Represent Graph Using 2D Arrays
The graph can be represented using various ways. One of the technique is to use a 2D array, also known as adjacency matrix. The adjacency matrix is a square matrix of size V x V to represent a finite graph data structure using a 2D array, where V is the number of nodes/vertex of the graph. In an undirected non-weighted graph, if there is an edge between vertex i and vertex j, the value at matrix[i][j] is 1 and if no edge exists, the value is 0. In this article, our task is to represent the graph using 2D arrays. ...
Read MoreC++ Program to Generate a Random Directed Acyclic Graph (DAG) for a Given Number of Edges
A Directed Acyclic Graph or DAG is a directed graph (a graph where each edge has a direction) that has no cycles present i.e. if we traverse along the direction of the edges then no closed loops are formed along any path. A DAG is always topologically ordered, i.e. for each edge in the graph, the start vertex of the edge(u) occurs earlier in the sequence than the ending vertex(v) of the edge i.e.(u {B C} B -> {Isolated Vertex} C -> {Isolated Vertex} D -> {B E} E -> {C} Steps to Generate Random Directed Acyclic Graph The ...
Read MoreDifference between \'struct\' and \'typedef struct\' in C++ program?
In C++ program, struct is a keyword used to define a structure, while typedef is a keyword that is used to create an alias for a data type. In this article, we will discuss the difference between struct and typedef struct in C++. Struct in C++ Struct is a keyword used to define a structure in C++. A structure is a user-defined data type that groups related variables of different data types into a single unit. Struct is same as a class, but the members of a struct are public by default. The syntax for defining a struct is ...
Read MoreDifference between string and char[] types in C++
In C++, char[] represents a character array, while string is a class in STL to manage text data. Both string and char[] can be used to store and process text data. But, they are different in terms of structure, usage, memory management, and capabilities. In this article, we will discuss the difference between string and char[] types in C++. char[] in C++ char[] is an array of characters that is used to store a string. It is a C-style string representation. The size of char array will be fixed. At the end of the array, a null character '\0' ...
Read MoreFunctors in C++
The functors are the function objects in C++. The functor allows an instance object of some class to be called as if it were an ordinary function. Let us consider a function that takes one argument. We can use this function as function object to do some task on a set of data. The Functors are widely used in STL algorithms like transform(), sort(), etc. Functor vs Regular Function: Need of Functor? Imagine we have a function that takes only one argument, like this: int increment(int x) { return x + 1; } Now, what ...
Read MoreC++ Program to Compute DFT Coefficients Directly
DFT stands for Discrete Fourier Transform. DFT is a mathematical technique in which we convert the signals of the time domain to their respective signal in the frequency domain, i.e., converting into a list of numbers that tell us which frequencies are present in that signal. Here, by time signal, we mean signals such as audio, temperature, etc. that changes over time. The frequency signal means the frequency of each signal present in the time signal. The numbers that tell us which frequencies are present in the signal are called the coefficients. In this article, our task is to compute ...
Read MoreInitialization of a normal array with one default value in C++
An array is a fixed-size collection of elements of the same data type that stores data in contiguous memory locations. Initializing an array with one default value in C++ is an easy task and can be easily implemented using various approaches that we are going to understand with code examples. Initializing Array with Zeroes in C++ To initialize all elements of an array with 0, we will simply initialize the array with 0 or just use empty curly braces. Example Here is an example that uses the above mentioned methods to initialize the array with 0: #include using ...
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