Programming Articles - Page 2660 of 3366

In the cmath library of C++, there are different functions for getting the square root except from sqrt. The sqrt is used basically for double type input. The others are used for float, long type data etc. Let us see the usage of these functions.The sqrt() FunctionThis function is used for double type data. So this returns square root of type double. The syntax is like below.double sqrt(double argument)Example#include #include #include using namespace std; main() {    double x = 144.0;    double y = 180.0;    cout

In the cstdlib library of C++, there are different functions for getting the absolute value except from abs. The abs are used basically for int type input in C, and int, long, long long in C++. The others are used for long, and long long type data etc. Let us see the usage of these functions.The abs() FunctionThis function is used for int type data. So this returns the absolute value of the given argument. The syntax is like below.int abs(int argument)Example#include #include #include using namespace std; main() {    int x = -145;    int y = 145;    cout

Here we will see the functionality of remainder() method of C++. The remainder() function is used to compute the floating point remainder of numerator/denominator.So the remainder(x, y) will be like below.remainder(x, y) = x – rquote * yThe rquote is the value of x/y. This is rounded towards the nearest integral value. This function takes two arguments of type double, float, long double, and returns the remainder of the same type, that was given as argument. The first argument is numerator, and the second argument is the denominator.Example#include #include using namespace std; main() {    double x = ... Read More

BeautifulSoup is a class in the bs4 module of python. Basic purpose of building beautifulsoup is to parse HTML or XML documents.Installing bs4 (in-short beautifulsoup)It is easy to install beautifulsoup on using pip module. Just run the below command on your command shell.pip install bs4Running above command on your terminal, will see your screen something like -C:\Users\rajesh>pip install bs4 Collecting bs4 Downloading https://files.pythonhosted.org/packages/10/ed/7e8b97591f6f456174139ec089c769f89a94a1a4025fe967691de971f314/bs4-0.0.1.tar.gz Requirement already satisfied: beautifulsoup4 in c:\python\python361\lib\site-packages (from bs4) (4.6.0) Building wheels for collected packages: bs4 Building wheel for bs4 (setup.py) ... done Stored in directory: C:\Users\rajesh\AppData\Local\pip\Cache\wheels\a0\b0\b2\4f80b9456b87abedbc0bf2d52235414c3467d8889be38dd472 Successfully built bs4 Installing collected packages: bs4 Successfully installed bs4-0.0.1To verify, ... Read More

The wcstoll() function is used to convert the wide character string to long long integers. It sets the pointer to point to the first character after the last one. The syntax is like below.long long wcstoll(const wchar_t* str, wchar_t** str_end, int base)This function takes three arguments. These arguments are like below −str: This is the starting of a wide string.str_end: The str_end is set by the function to the next character, after the last valid character, if there is any character, otherwise null.base: This specifies the base. The base values can be of (0, 2, 3, …, 35, 36)This function ... Read More

The strol() function is used to convert the string to long integers. It sets the pointer to point to the first character after the last one. The syntax is like below. This function is present into the cstdlib library.long int strtol(const char* str, char ** end, int base)This function takes three arguments. These arguments are like below −str: This is the starting of a string.str_end: The str_end is set by the function to the next character, after the last valid character, if there is any character, otherwise null.base: This specifies the base. The base values can be of (0, 2, ... Read More

Here we will see what is the use of ldexp() method in C or C++. This function returns any variable x raise to the power of exp value. This takes two arguments x and exp.The syntax is like below.float ldexp (float x, int exp) double ldexp (double x, int exp) long double ldexp (long double x, int exp) double ldexp (T x, int exp)Now let us see one example to get a better idea.Example#include #include using namespace std; int main() {    double a = 10, res;    int exp = 2;    res = ldexp(a, exp); // Finds a*(2^exp)    cout

In this section we are going to create a Whatsapp chatbots, but unlike few other chatbots for twitter or facebook, whatsapp chatbots don’t run on the platform directly because of whatsapp’s policies.But there is a way to get is done, using selenium, a very smart package in python with which developer’s can automate the browser’s activity. With this we can make use of whatsapp-web through the browser.RequirementsWe need three basic things to get things done: Selenium.We can install selenium very easily using pip, just run below command on your terminal −$pip install seleniumChrome/firefox or any other webdriver.As I using chrome ... Read More

Python provides different modules like urllib, requests etc to download files from the web. I am going to use the request library of python to efficiently download files from the URLs.Let’s start a look at step by step procedure to download files using URLs using request library−1. Import moduleimport requests2. Get the link or urlurl = 'https://www.facebook.com/favicon.ico' r = requests.get(url, allow_redirects=True)3. Save the content with name.open('facebook.ico', 'wb').write(r.content)save the file as facebook.ico.Exampleimport requests url = 'https://www.facebook.com/favicon.ico' r = requests.get(url, allow_redirects=True) open('facebook.ico', 'wb').write(r.content)ResultWe can see the file is downloaded(icon) in our current working directory.But we may need to download ... Read More

Everybody loves to write reusable code, right? Then partial function is a cool thing to learn. Partial functions allows us to derive a function with x parameters to a function with fewer parameters and constant values set for the more limited function.We can write partial functional application in python through functools library. Below is a simple example of partial function from the functools library with the add function from the operator library.>>> from functools import * >>> from operator import * >>> add(1, 2) 3 >>> add1 = partial(add, 4) >>> add1(6) 10 >>> add1(10) 14Partial is a higher order ... Read More