Programming Articles - Page 2989 of 3363

A local array cannot be directly returned from a C++ function as it may not exist in memory after the function call. A way to resolve this is to use a static array in the function. As the lifetime of the static array is the whole program, it can easily be returned from a C++ function without the above problem.A program that demonstrates this is given as follows.Example Live Demo#include using namespace std; int *retArray() {    static int arr[10];    for(int i = 0; i

A 2-D array can be easily passed as a parameter to a function in C. A program that demonstrates this when both the array dimensions are specified globally is given as follows.Example Live Demo#include const int R = 4; const int C = 3; void func(int a[R][C]) {    int i, j;    for (i = 0; i < R; i++)    for (j = 0; j < C; j++)    a[i][j] += 5; ; } int main() {    int a[R][C];    int i, j;    for (i = 0; i < R; i++)    for (j = 0; ... Read More

A 2D array can be dynamically allocated in C using a single pointer. This means that a memory block of size row*column*dataTypeSize is allocated using malloc and pointer arithmetic can be used to access the matrix elements. A program that demonstrates this is given as follows. Example Live Demo #include #include int main() { int row = 2, col = 3; int *arr = (int *)malloc(row * col * sizeof(int)); int i, j; for (i = 0; i < row; i++) ... Read More

The details about a pointer and array that showcase their difference are given as follows.PointerA pointer is a variable that stores the address of another variable. When memory is allocated to a variable, pointer points to the memory address of the variable. Unary operator ( * ) is used to declare a pointer variable.The following is the syntax of pointer declaration.datatype *variable_name;Here, the datatype is the data type of the variable like int, char, float etc. and variable_name is the name of variable given by user.A program that demonstrates pointers is given as follows.Example Live Demo#include int main () { ... Read More

Use of the new operator signifies a request for the memory allocation on the heap. If the sufficient memory is available, it initializes the memory and returns its address to the pointer variable.The new operator should only be used if the data object should remain in memory until delete is called. Otherwise if the new operator is not used, the object is automatically destroyed when it goes out of scope. In other words, the objects using new are cleaned up manually while other objects are automatically cleaned when they go out of scope.The following is the syntax of new operator.pointer_variable ... Read More

News API is very famous API for searching and fetching news articles from any web site, using this API anyone can fetch top 10 heading line of news from any web site. But using this API, one thing is required which is the API key. Example Code import requests def Topnews(): # BBC news api my_api_key="Api_number” my_url = = " https://newsapi.org/v1/articles?source=bbc-news&sortBy=top&apiKey=my_api_key" my_open_bbc_page = requests.get(my_url).json() my_article = my_open_bbc_page["articles"] my_results = [] for ar in my_article: ... Read More

Minkowski distance is a metric in a normed vector space that measures the distance between two or more vectors. This is typically used in machine learning to find distance similarity. The formula to calculate the Minkowski distance is - $$\mathrm{D= \big[\sum_{i=1}^{n}|r_i-s_i|^p\big]^{1/p}}$$ Where, xi and yi: Two points in n-dimensional space p: Parameter that determines the type of distance being calculated. For example, if p=1, it is the Manhattan distance, and if p=2, it represents Euclidean distance. For example, if we consider the following vector's as input - x = (0, ... Read More

Here we are using regular expression package for extracting email-id from the URL-text file. Given the URL- text file. Using regular expression package we define the pattern of email-id then use findall() function, using this method to check the text which will match with this pattern. Input text= Please contact us at contact@tutorialspoint.com for further information."+\ " You can also give feedback at feedback@tutorialspoint.com" Output ['contact@tutorialspoint.com ', 'feedback@tutorialspoint.com'] Example code import re my_text = "Please contact us at contact@tutorialspoint.com for further information."+\ " You can also give feedback at feedback@tutorialspoint.com" my_emails = re.findall(r"[a-z0-9\.\-+_]+@[a-z0-9\.\-+_]+\.[a-z]+", ... Read More

Floating number is a number that has a decimal point and can represent both large and very small values. Binary number is a number expressed in the base-2 numeral system, using 0's and 1's. The conversion of floating-point number to binary representation in Python requires to represent the number in the IEEE 754 format(a set of representation of numerical values and symbols). For example, consider a floating number 9.87, its IEEE 754 32-bit binary representation (1 bit for the sign, 8 bits for exponent, and 23 bits for the significand) is "01000001000111011110101110000101". In this article, we will discuss different ways ... Read More

In this article, we will discuss different methods used to right rotate a list from the given rotation number. A list has comma-separated values (items) of same type or different type between square brackets. To right rotate a list by n, Python offers many ways such as using slicing, rotate() method of the deque object and others. Let's discuss these ways in detail with examples - myList = [5, 20, 34, 67, 89, 94, 98, 110] The following is the output if we assign n as 4 − 89, 94, 98, 110, 5, 20, 34, 67 Right ... Read More