How to Concatenate Strings Safely in C (strcat vs strncat)
Concatenate strings in C: compare strcat() with bounded strncat(), calculate target buffer sizes, prevent buffer overflow vulnerabilities, and add \0.
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Akshay Patankar
How to Get Linux System Uptime in C
Query Linux system runtime and uptime in C: master POSIX sysinfo(&info) struct, calculate days/hours/minutes, and read /proc/uptime.
How to Write a String to a File in C (fputs vs fprintf)
Write string text to files in C: master fopen("w"), fputs(), fprintf(), file permission modes, error validation, and explicit fclose() flushing.
How to Get and Format Current Date/Time in C
Format real-time timestamps in C: use time(), localtime(), struct tm, and strftime() to generate ISO 8601 YYYY-MM-DD HH:MM:SS date strings.
How to Read Files in a Directory in C (dirent.h)
Traverse and read directory files in C: master POSIX opendir(), readdir(), closedir(), struct dirent, and file type checking (DT_REG, DT_DIR).
Safely Remove Directory in C: Simple Guide for Efficient File Management
File management is an essential aspect of any programming language, and C programming is no exception. If … Read more
How to Write C Structures to Binary Files using fwrite
Write struct data to binary files in C using fwrite(): master fread() deserialization, binary "wb" mode, structure padding alignment, and sizeof.
Unions in C: Memory Sharing, Syntax, and Struct Differences
Master C unions: understand shared memory allocation, struct vs union memory layout, tagged unions, bit-field register packing, and type punning.
Variable Arguments in C: Flexible and Powerful Coding Techniques
In C programming, understanding variable arguments can significantly enhance the flexibility and usability of your code. Variable … Read more
How to Get Current Working Directory in C (getcwd)
Get current working directory path in C: use POSIX getcwd(buffer, size), handle PATH_MAX limits, dynamic memory allocation, and chdir().
Create Directory in C
Creating directory in C is a fundamental aspect of file management that allows developers to organize files … Read more
Standard Library Functions in C: Unlock the Power of Built-In Efficiency
Standard library functions in C are a set of built-in functions that are provided by the C … Read more
Structure Pointers in C: Arrow Operator (->) and Memory Allocation
Master structure pointers in C: use arrow operator (->), allocate dynamic structs via malloc(), pass struct pointers to functions, and avoid copies.
Typecasting in C: Implicit vs Explicit Data Type Conversion
Master typecasting in C: compare implicit type promotion with explicit (type) expression casting, pointer typecasts, integer division truncation, and overflow.
Boolean Data Types in C (stdbool.h, bool, true, false)
Use Boolean data types in C: include <stdbool.h>, declare bool variables with true and false values, evaluate truthiness, and compare C99 _Bool.
#pragma Directives in C: #pragma once, pack, and GCC Pragmas
Master #pragma directives in C compilers: replace include guards with #pragma once, pack struct alignment via #pragma pack(push, 1), and suppress lints.
Functions in C
Function in C programming is a group of statements which are separated from main task for the … Read more
Associativity of Operators in C Programming
When some expression in C contains two operators with same/equal priority, the expression gets executed as per … Read more
Feof() end-of-file indicator function in C – Example
The function feof() tests the end-of-file indicator for the stream pointed to by stream, returning nonzero if … Read more
C program in Linux to find the current working directory (PWD)
getcwd, getwd, get_current_dir_name functions return a null-terminated string containing an absolute pathname that is the current working … Read more
C program to convert integer number to string
Following program converts integer number 42 to string “42” using sprintf. sprintf() writes to the character string. … Read more
Write Comments in C Program
In C program, comments doesn’t have any use other than for better understanding of the developers of … Read more
C program to know storage size of int, char and float
To get the exact size of a type or a variable on a particular platform, you can … Read more
C Modulo Operator: Check Divisibility and Remainders
A practical look at C’s % operator: when a zero remainder proves divisibility, what negative results mean, and which edge cases need a guard.