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In this article we will see how to add two numbers without using arithmetic operators like +, ++, -, or --. This technique uses bitwise operations to simulate binary addition. To solve this problem, we can use binary adder logic. In digital circuits, we design half adder and full adder circuits that can add one-bit binary numbers. By cascading multiple adders, we can create circuits to add bigger numbers. In binary addition, we perform XOR operation for the sum bits, and AND operation for the carry bits. These principles are implemented here to add two numbers using only ... Read More
In Laravel Blade templates, you can insert values into hidden input fields using Blade syntax or Laravel's Form helpers. Hidden fields are commonly used to store data like CSRF tokens, user IDs, or secret keys that need to be submitted with forms but should not be visible to users. Basic Hidden Input with Blade Syntax The simplest way is to use standard HTML with Blade template syntax − Route Setup Basic Blade Template (hello.blade.php) {{$mymsg}} Welcome to Tutorialspoint Adding Hidden Input with Dynamic Values ... Read More
Both C and C++ support void pointers, but their behavior differs significantly. In C, a void pointer can be directly assigned to any other pointer type without explicit typecasting. However, in C++, assigning a void pointer to any other pointer type requires an explicit typecast. Syntax void *pointer_name; Void Pointer in C A void pointer (also called a generic pointer) in C is a special type of pointer that can point to any data type, but doesn't have any type by itself. It can hold the address of any variable (int, float, char, etc.). ... Read More
In Laravel, the .env file contains environment variables that configure your application's behavior across different environments (local, staging, production). While these variables are typically static, you can modify them dynamically using PHP file operations. Understanding the .env File The .env file contains key-value pairs for configuration − APP_NAME=Laravel APP_ENV=local APP_KEY=base64:BUdhVZjOEzjFihHKgt1Cc+gkQKPoA4iH98p5JwcuNho= APP_DEBUG=true APP_URL=http://localhost DB_CONNECTION=mysql DB_HOST=127.0.0.1 DB_PORT=3306 DB_DATABASE=test DB_USERNAME=root DB_PASSWORD= These variables are used throughout Laravel's configuration files in the config/ folder and should not be committed to version control as they vary per environment. Fetching Current Environment You can retrieve the current ... Read More
In C and C++, you normally cannot use a function call on the left side of an assignment if it returns a value by copy, because function calls return non-assignable temporary values. However, there are specific cases where this is possible − Syntax // Invalid - function returns value by copy function_name() = value; // Compiler error // Valid - function returns pointer (C) *function_name() = value; // Dereference pointer // Valid - function returns reference (C++ only) function_name() = value; ... Read More
The json_decode() method is a PHP built-in function that helps convert a JSON string into a PHP object or associative array. It takes the input value as a string and returns a readable PHP object or array that can be easily looped through using foreach. Basic JSON Decoding Following is an example of the json_decode() method − stdClass Object ( [Neha] => 35 [Arbaaz] => 37 [Rehan] => 43 ) Looping Through JSON Objects The JSON object ... Read More
Laravel Eloquent provides powerful methods to create or update records in your database. The updateOrCreate() method and DB facade's updateOrInsert() method offer elegant solutions for upsert operations. Prerequisites: You need Laravel installed with a configured database connection and a Student model created. Assume we have created a table named students using the CREATE statement as shown below − CREATE TABLE students( id INTEGER NOT NULL PRIMARY KEY, ... Read More
In C programming, understanding operator precedence between prefix increment (++var), postfix increment (var++), and dereference operator (*) is crucial for writing correct pointer code. The precedence order is: postfix operators have highest precedence, followed by prefix operators, then dereference. Syntax ++*ptr // Equivalent to ++(*ptr) - increment value at ptr *ptr++ // Equivalent to *(ptr++) - dereference then increment pointer (*ptr)++ // Increment value at ptr (postfix) Precedence Rules Postfix ++/-- has highest precedence Prefix ++/-- and dereference * have same precedence (right-to-left associativity) When ptr is a pointer: *ptr++ means ... Read More
Character literals are values assigned to character data type variables. They are written as single characters enclosed in single quotes (' ') like 'A', 'b' or '2'. However, the type of character literals differs between C and C++. In C, character literals are stored as type int, whereas in C++ they are stored as type char. This fundamental difference affects memory usage and type safety. Syntax 'character' // Character literal syntax Type of Character Literal in C In C, character literals have type int and occupy 4 bytes of memory. This happens ... Read More
In Laravel, you can extract raw form data using several methods depending on your needs. Laravel's Request class provides various methods to access form data in different formats − raw strings, arrays, or individual field values. Using file_get_contents() The file_get_contents() function with php://input returns the raw POST data as a string. This method captures the exact data sent from the form ? _token=zHuIkXpqcRqvZO4vTgxH0fFk5fCmvqSavrCjHVMi&username=testing&password=abcd Using getContent() Method The getContent() method on Laravel's Request class returns the raw request body as a string − similar to file_get_contents() but more Laravel-specific ? ... Read More