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Technical articles with clear explanations and examples
How to declaring pointer variables in C/C++?
A pointer is a variable that stores the memory address of another variable. To declare pointer variables in C, we use the asterisk (*) operator before the variable name during declaration. Syntax data_type *pointer_name; Where data_type is the type of variable the pointer will point to, and pointer_name is the name of the pointer variable. Basic Pointer Declaration and Usage Here's how to declare and use pointer variables in C − #include int main() { // A normal integer variable int ...
Read MoreHow to compare pointers in C/C++?
Pointers in C can be directly compared using relational operators to check their memory addresses. This allows us to determine equality, ordering, and relative positions of pointers in memory. Syntax pointer1 == pointer2 // Equality comparison pointer1 != pointer2 // Inequality comparison pointer1 < pointer2 // Less than comparison pointer1 > pointer2 // Greater than comparison pointer1 = pointer2 // Greater than or equal Pointer Comparison in C In C, we can compare pointers using relational operators ...
Read MorePHP Program to Print Multiplication Table
A multiplication table is a useful mathematical tool that displays the products of a given number with a range of values, typically from 1 to 10. In this article, we will learn multiple ways to generate and print multiplication tables in PHP. Formula to Generate Multiplication Table To create a multiplication table for any number, use the formula ? Answer = Number × Multiplier Where: Number is the fixed value for which the table is generated Multiplier is the range of values (e.g., 1 ...
Read MorePHP Program for Binary to Decimal Conversion
Binary to decimal conversion is the process of converting a binary number (base-2 number using only 0s and 1s) into its equivalent decimal number (base-10 form). In this article, we will learn how to convert binary numbers to decimal form in PHP using different approaches. How Binary to Decimal Conversion Works To convert a binary number to decimal, multiply each binary digit by 2 raised to the power of its position (starting from 0 on the right), then sum all results ? Binary to Decimal Conversion: 1011 Position: ...
Read MoreThe best way to check if a file exists using standard C/C++
In C programming, checking if a file exists is a common task that can be accomplished by attempting to open the file for reading. If the file opens successfully, it exists; otherwise, it doesn't exist. Syntax FILE *fopen(const char *filename, const char *mode); Method 1: Using fopen() Function The most straightforward approach is to use fopen() to attempt opening the file in read mode − #include int main() { FILE *file; /* Try to open file for ...
Read MoreHow to write my own header file in C?
Creating your own header file in C allows you to organize and reuse code across multiple programs. A header file typically contains function declarations, constants, and macros that can be included in other C files. Syntax #include "your_header_file.h" Steps to Create a Custom Header File Create the header file: Write your functions and save with .h extension Include in main program: Use #include "filename.h" (quotes, not angle brackets) Ensure same directory: Both files must be in the same folder Call functions: Use the functions directly in your main program Header File: ...
Read MorePHP Program to Count Vowels in a String
A string is a sequence of characters, including alphabets, numbers, and symbols. In this tutorial, we are going to learn how we can count the number of vowels in a given string in PHP using different approaches. Vowels in English are a, e, i, o, u, and they can be either uppercase or lowercase. What is a Vowel? Vowels are alphabetic characters that represent specific speech sounds. There are a total of five vowels, both uppercase and lowercase in the English language: a, e, i, o, u A, E, I, O, U Example 1 ...
Read MoreHow to use use an array of pointers (Jagged) in C/C++?
In C programming, an array of pointers (also known as jagged arrays) allows you to store multiple pointers in a single array. This is particularly useful when working with strings of different lengths or when you need to point to different memory locations dynamically. Syntax data_type *array_name[size]; Where data_type is the type of data the pointers will point to, and size is the number of pointers the array can hold. Example 1: Array of Integer Pointers The following example demonstrates how to create an array of pointers that point to integer values − ...
Read MoreHow to Install phpMyAdmin with Nginx on Ubuntu?
When you try to build a website for production or just start learning web development, you need a server to make your web application accessible from the browser to other users, either to use it or test its functionality. Nginx is a better choice for a server to serve websites. It is known for its efficiency and capacity to handle large traffic. Nginx can also work as a reverse proxy and load balancer. The pronunciation of the word "Nginx" is like this: engine-x. phpMyAdmin is a web interface to manage MySQL and MariaDB databases. It allows us to ...
Read MoreWrite a program that produces different results in C and C++
Here we will see some programs that produce different results when compiled with C and C++ compilers. These differences arise from how C and C++ handle certain language features differently. Difference 1: Character Literal Size In C, character literals are treated as int type, while in C++, they are treated as char type. This affects the result of the sizeof() operator − Example: C Compiler #include int main() { printf("The character: %c, size(%d)", 'a', sizeof('a')); return 0; } The character: a, size(4) ...
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