C Programming Tutorials

C Programming Tutorials And Articles
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During C programming, file operations are pretty common. And when you are writing programs in C on Linux, two familiar terms related to file operations are File Pointers and File Descriptors. We know both are different, but what are they? This article will focus on understanding what are file...
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If you are an experienced C/C++ programmer then you must have definitely observed some weird behaviors of code in certain situations. These weird behaviors can be due to various reasons but most of them are because of stack corruption. For all those who have no idea about what stack corruption is,...
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If you work 3-4 hours daily on coding in C/C++ then there ought to be some programs, logics, tricks, tips etc which you come across daily. Some are new to only you while others are interesting enough to be shared. Here in this article, I am going to share one interesting program and how I went...
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The other day I was searching a bit on Linux viruses on Internet. Though there are quite a few now but still cannot be compared with the volumes that we have on windows. Another thing that I found was the permission robustness that Linux file system has as compared to windows OS. So, whiling...
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After writing my previous article Virus Code in Linux - C Code That Changes it's Process Name Run Time, I wondered if a process can change its name then why cannot it change its PID. And what if a process can change both its name and PID after lets say every 1 second? Well it will be a difficult...
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malloc allocates certain amount of memory during program execution and free de-allocates memory previously allocated using a call to functions like malloc, calloc or realloc. Memory leak can occurs when a program allocates memory but does not release it. Understanding malloc() & free() ...
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Most of the people working on Linux must have used the basic command 'ls'. I use it many times a day. It is a very useful command when it comes to displaying the contents of a directory and their properties. For those few who have still not used 'ls' its high time now, go to its man page, study it...
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This is the fourth post in which I want to share with you some useful observations on error patterns and the ways of fighting them. This time I will touch upon the subject of handling rare and emergency conditions in programs. While examining a number of applications, I came to a conclusion that...
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Type casting is an explicit type conversion requested by the programmer to achieve its objective in the program. During any kind of computations involving various data variables of different data types, leads to the need of typecasting. Syntax used: (Data-type-2)<variable/expression of data...
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Recently I have been writing a lot on Linux files and functions related to file I/O. So, extending the discussion further in this article lets discuss two more important Linux functions : A) access(const char *pathname, int mode) This function checks whether the calling process can access...
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I have been writing many articles on C/Linux explaining concepts, APIs and their usage etc. This time I thought to write on a fundamental concept that every newbie should be well aware of in order to become a good coder, ie 'Good coding practices'. I have 3-4 broader level points to make here. I'll...
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If you are a developer then you would definitely be aware of the concept of temporary files. Temporary files, as the name suggest is temporary in its persistence. Either a process creates a temporary file to hold data for certain time or to pass information to another process. An ideal process...
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In this tutorial, we'll be looking at the code structure of the 'echo' utility and will try to understand how it works, for those who are unfamilliar with the 'echo' utility, its one of the most basic and most useful utilities in a shell it prints out its arguments on the standard output, if you...
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In this article we'll be learning how we can improve our C code by using Macros instead of functions. How simple functions can be converted into macros to save on some CPU instructions. Some basic knowledge of C and a little bit Assembly is considered as pre-requisites. The Code We'll be...
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What are Hash Tables? Hash table is a data structure to store key value pairs for all situations. So it is like a table with each entry has a key and a value corresponding to it. So, it is an efficient way of mapping and accessing data. An abstract illustration of hash table: -> Data...
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The Need Most of our articles over here are focused on Linux programming. However, many of us, especially beginners are still comfortable and much used to Windows environment, the look and feel of it. And also,many out of them tend to avoid Linux programming because of the pain of installing...
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Data types are basically used to store different types of data that can be easily accessed by the program. C provides us with data-types giving us immense functionality to store different types of data in a C program . like : characters , integers , decimals , floats etc. Variables, Constants...
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What are format strings Format strings are strings that are used to render and arbitrary number of varied datatype parameters into a string when given as a input to string formatting functions like printf, sprint etc. Understanding 'printf' 'printf' is a standard format string function in...
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Conditional Statements (also called Conditions) are features of a programming language , Which allows it to perform actions depending upon some conditions provided by the programmer , This provides a “ DECIDING” functionality to a computer program and allows for flexible and easy code development....
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This article is a continuation of my previous article on conditions in C. In the previous article we talked about conditions in C and some if – else statements now in this article we’ll be focusing o how to use these if-else statement in a C program. So what’s the waiting then let’s get started....
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