exec family of functions in C

The exec family of functions replaces the current running process with a new process. It can be used to run a C program by using another C program. It comes under the...

Write one line functions for strcat() and strcmp()

Recursion can be used to do both tasks in one line. Below are one line implementations for stracat() and strcmp(). /* my_strcat(dest, src) copies data of sr...

C Library math.h functions

The math.h header defines various mathematical functions and one macro. All the functions available in this library take double as an argument and return double as th...

strdup() and strndup() functions in C/C++

The strdup() and strndup() functions are used to duplicate a string. strdup() : Syntax : char *strdup(const char *s); This function returns a pointer to a null-termi...

isalpha() and isdigit() functions in C/C++ with example

isalpha(c) is a function in C which can be used to check if passed character is an alphabet or not. It returns a non-zero value if it’s an alphabet else it ret...

Functions that are executed before and after main() in C

With GCC family of C compilers, we can mark some functions to execute before and after main(). So some startup code can be executed before main() starts, and some cle...

Static functions in C

Prerequisite : Static variables in C In C, functions are global by default. The “static” keyword before a function name makes it static. For example, be...

Nested functions in C

Some programmer thinks that defining a function inside an another function is known as “nested function”. But the reality is that it is not a nested fun...

Macros vs Functions

Macros are pre-processed which means that all the macros would be processed before your program compiles. However, functions are not preprocessed but compiled. See th...

std::stol() and std::stoll() functions in C++

std::stol(): This function converts the string, provided as an argument in the function call, to long int. It parses str interpreting its content as an integral numb...