GeeksforGeeks

Why performance analysis? There are many important things that should be taken care of, like user friendliness, modularity, security, maintainability, etc. Why to worry about performance?

Scope of an identifier is the part of the program where the identifier may directly be accessible. In C, all identifiers are lexically (or statically) scoped. C scope rules can be covered under following two categories.

A function is called pure function if it always returns the same result for same argument values and it has no side effects like modifying an argument (or global variable) or outputting something.

The volatile keyword is intended to prevent the compiler from applying any optimizations on objects that can change in ways that cannot be determined by the compiler.

A typical memory representation of C program consists of following sections.

What are the differences between Mutex vs Semaphore? When to use mutex and when to use semaphore?

Object Oriented Programming paradigm deals with centralizing data and associated behaviours in a single entity. The entities will communicate by message passing.

There are posts on representation of floating point format. The objective of this article is to provide a brief introduction to floating point format.

What do we mean by data alignment, structure packing and padding? Predict the output of following program.

What we mean by reentrancy and reentrant function? What is it’s significance in programming? What are the conditions that a function to be reentrant?

We know that the elements in a structure will be stored in sequential order of their declaration.

Recursion: In programming terms a recursive function can be defined as a routine that calls itself directly or indirectly.

exit() exit() terminates the process normally.

A quine is a program which prints a copy of its own as the only output. A quine takes no input. Quines are named after the American mathematician and logician Willard Van Orman Quine (1908–2000). The interesting thing is you are not allowed to use open and then print file of the program.

Consider the below program.

Asked by geek4u Consider the below program.

Let us consider the below program.

In C, a string can be referred either using a character pointer or as a character array.

Registers are faster than memory to access, so the variables which are most frequently used in a C program can be put in registers using register keyword.

Uninitialized pointers are known as wild pointers because they point to some arbitrary memory location and may cause a program to crash or behave badly.

Memory leak occurs when programmers create a memory in heap and forget to delete it.
Memory leaks are particularly serious issues for programs like daemons and servers which by definition never terminate.

Most of us have studied Computer Networks in a very abstract manner. In other words, not many of us know how the abstract concepts of layers and packets translate in real life networks such as the Internet. Therefore let us do an experiment and see whether these layers, packets etc. exist in any real network [...]

I’m sure that this post will be as interesting and informative to C virgins (i.e. beginners) as it will be to those who are well versed in C. So let me start with saying that extern keyword applies to C variables (data objects) and C functions.

What are these? Little and big endian are two ways of storing multibyte data-types ( int, float, etc). In little endian machines, last byte of binary representation of the multibyte data-type is stored first. On the other hand, in big endian machines, first byte of binary representation of the multibyte data-type is stored last.