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Articles by Chandu yadav
Page 52 of 81
How to work with Bootstrap?
To work with Bootstrap, the following are the steps − Download the latest version of Bootstrap from the official website.On reaching the page, click on DOWNLOAD for current version 4.1.1You have two options on clicking Download above,Download Bootstrap − Clicking this, you can download the precompiled and minified versions of Bootstrap CSS, JavaScript, and fonts. No documentation or original source code files are included.Download Source − Clicking this, you can get the latest Bootstrap LESS and JavaScript source code directly from GitHub.
Read MoreHow to identify and print all the perfect numbers in some closed interval [ 2, n ] using Python?
A perfect number is a positive integer that is equal to the sum of its proper divisors. The smallest perfect number is 6, which is the sum of 1, 2, and 3.You can find perfect numbers within a given range by testing each number for the given condition in the given range. exampledef print_perfect_nums(start, end): for i in range(start, end + 1): sum1 = 0 for x in range(1, i): # Check if a divisor, if it is, add to sum if(i % x == 0): sum1 = sum1 + x if (sum1 == i): print(i) print_perfect_nums(1, 300)OutputThis will give the output6 28
Read MoreWhat are Python coding standards/best practices?
You can use the PEP8 guide as a holy grail. Almost all python world uses this guide to write clean understandable and standard python code. This is available as an extension as a linter for all modern text editors. You can check it out at http://www.python.org/dev/peps/pep-0008/Properly Structure your folders. All projects need proper structuring. This helps organize code better. Python has an opinionated folder structure that you should use.README.rst LICENSE setup.py requirements.txt sample/__init__.py sample/core.py sample/helpers.py docs/conf.py docs/index.rst tests/test_basic.py tests/test_advanced.pyUse doctests. The doctest module searches for pieces of text that look like interactive Python sessions, and then executes those sessions to ...
Read MoreWhat is "Argument-Dependent Lookup" ("Koenig Lookup") in C++?
Argument-dependent lookup(ADL) is a protocol for looking up unqualified function names in function-call expressions.These function call expressions include implicit function calls to overloaded operators.The function names are looked up in the namespaces of their arguments in addition to the scopes and namespaces considered by the usual unqualified name lookup. Argument-dependent lookup makes it possible to use operators defined in a different namespace. Examplenamespace MyNamespace{ class A {}; void f( A &a, int i) {} } int main() { MyNamespace::A a; f( a, 0 ); //calls MyNamespace::f }The lookup of a function call to f was dependent ...
Read MoreHow do I declare a two-dimensional array in C++ using new?
A dynamic 2D array is basically an array of pointers to arrays. So you first need to initialize the array of pointers to pointers and then initialize each 1d array in a loop.example#include using namespace std; int main() { int rows = 3, cols = 4; int** arr = new int*[rows]; for(int i = 0; i < rows; ++i) arr[i] = new int[cols]; return 0; } This will create an 2D array of size 3x4. Be vary of clearing the memory in such cases as you'll need to delete the memory in the ...
Read MoreHow do you set, clear, and toggle a bit in C/C++?
You can set clear and toggle bits using bitwise operators in C, C++, Python, and all other programming languages that support these operations. You also need to use the bitshift operator to get the bit to the right place.Setting a bitTo set a bit, we'll need to use the bitwise OR operator −Example#include using namespace std; int main() { int i = 0, n; // Enter bit to be set: cin >> n; i |= (1 > n; i ^= (1
Read MoreWhy is not sizeof for a struct equal to the sum of sizeof of each member in C/C++?
The difference between sizeof for a struct and the sum of sizeof of each member of that struct is due to byte padding and alignment. Every data type in C/C++ has a alignment requirement. A processor will have processing word length of its architecture. On a 32 bit machine, the processing word size will be 4 bytes or 32 bits. For example, If you have the struct −Example#include using namespace std; struct X { char b[3]; int c; }; int main() { char b[3]; int c; int total = sizeof(b) + sizeof(c); cout
Read MoreHow can we combine functions in MySQL?
Combining of functions in MySQL is quite possible by providing a function as the argument of other function. It is also called nesting of functions. To understand it, consider some examples belowmysql> Select UPPER(CONCAT('www.', 'tutorialspoint', '.com'))As Tutorials; +------------------------+ | Tutorials | +------------------------+ | WWW.TUTORIALSPOINT.COM | +------------------------+ 1 row in set (0.00 sec) mysql> Select LOWER(CONCAT('WWW.', 'TUTORIALSPOINT', '.COM'))As Tutorials; +------------------------+ | Tutorials | +------------------------+ | www.tutorialspoint.com | +------------------------+ 1 row in set (0.00 sec)The above queries combine UPPER() and LOWER() function with CONCAT() function.Similarly, we can combine more ...
Read MoreHow can we split an IP Address into four respective octets by using MySQL SUBSTRING_INDEX() function?
Suppose we have a table named ‘ipaddress’ which contains the IP addresses as its values in column ‘IP’ as follows −mysql> Select * from ipaddress; +-----------------+ | ip | +-----------------+ | 192.128.0.5 | | 255.255.255.255 | | 192.0.255.255 | | 192.0.1.5 | +-----------------+ 4 rows in set (0.10 sec)Now with the help of SUBSTRING_INDEX() function in the following query, we can divide the IP address in four octets −mysql> Select IP, SUBSTRING_INDEX(ip, '.', 1)AS '1st Part', -> SUBSTRING_INDEX(SUBSTRING_INDEX(ip, '.', 2), '.', -1)AS '2nd Part', ...
Read MoreHow can I use another MySQL function/s with REPEAT() function?
Suppose if we want to make the output of REPEAT() function more readable then we can use another function/s with it. For example, if we want to add space or some other character between the repeated values then we can use CONCAT() function.Examplemysql> Select REPEAT(CONCAT(' *', Subject, '* '), 3)AS Subject_repetition from student; +-----------------------------------------+ | Subject_repetition | +-----------------------------------------+ | *Computers* *Computers* *Computers* | | *History* *History* *History* | | *Commerce* *Commerce* *Commerce* | | *Computers* *Computers* *Computers* | ...
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