C Programming Tutorials

C Programming Tutorials And Articles
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The code to find upper and lower diagonal of 3x3 matrices #include<conio.h> #include<stdio.h> void main() { int a,i,j,k; clrscr(); printf("\n Enter a Matrix 3x3:\n\n");
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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 second article on avoiding certain errors at the early stage of code writing. In the previous post, we have already advised you to avoid a large number of calculations in one expression. However, we should investigate this question in detail. Let's see what's dangerous about complex...
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Pointer and reference maybe same at assembly level. Try an experiment : # include<stdio.h> int main() { int i =90; int *pointer; int &reference = i; // Line 6
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For a given problem, there maybe many solutions, but we always look for a ‘better’ solution. So, how do we determine which solution is ‘better’? In the context of algorithms and programs, we consider a solution as ‘better’ when it uses the minimum resources. Hence, an efficient program will always...
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List of helpful C tools that will help you peek inside a process or an a.out file. Some are specific to Sun OS. I have compiled it into an easy-to-read summary of what each one does, and where to find them. Going through the man pages for each, and try running each on a couple of different a.out’s...
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The keyword ‘static’ has been widely used in many programming languages. I know it is there in Java, C and C++. I am pretty sure, it is must be used in other languages as well, even though it might depict different attributes and characteristics. However, we are going to learn about the keyword...
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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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Strings are paramount datatype for any real use case scenario. However, in C, there is no basic datatype as ‘string’. A string is understood as a collection set of characters i.e. in programmatic language, an array of characters, which are: Directly assigned in double quotes Terminated by a...
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As it is said, great things are in small ones. Its someway true in C as well. Working on bits rather than bytes, and other bigger data structures leverage implementations in speed and space efficiency. With really high end computers coming up these days, bitwise operations may not be that useful in...
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Introduction The aim of this article is to explain the upcasting. Before going through this article I expect people have some preliminary idea about inheritance mechanism. Background The term upcasting comes from the class inheritance diagram. In the class inheritance diagram we...
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Introduction After long day's discussion, bool was made as built-in type. Before it lot of other proposals came for bool. There were following proposals. Proposal 1: bool can be implemented by typedef typedef int bool ; It works fine but problem is that if someone overloads functions...
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Algorithms are the riches of any programming language. The major objective of any algorithm is being efficient and optimized. For any logical scenarios, the prime and foremost is designing an algorithm. In this article, we shall we be discussing one such scenario to determine the k-th maximum /...
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The motivation behind writing this article came from the fact that there are still many books/tutorials/softwares etc where I have seen 'void main' being used instead of 'int main'. Still most of the C/C++ newbies are taught to start practice coding with 'void main'. Even I started practicing C in...
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When an ELF executable is executed, a process is created and its process image is create in the RAM. However, it is here in the process image in RAM, all the variables are assigned memory. Sometimes memory is allocated statically i.e. defined how much memory at the compile time, and at times it has...
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Introduction I always like smilies and the ASCII characters can behave like good smileys and so I wrote a small utility to get all tha ASCII values of the characters and I can easily add them anywhere I prefer The Code int i; FILE *fp; fp = fopen("c:\\code.txt","w"); for(i=0;i<256;i++)
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Introduction On 4th August, shabbir posted this question : (at the $1 Daily contest thread) List a set of prime numbers where the sum total of the complete set is 100. So, I thought why not generate try generating *all* such sets of primes, instead of *any* such set ? And, I sat down to...
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This is the third article where I will tell you about a couple of new programming methods that can help you make your code simpler and safer. You may read the previous two posts here and here . This time we will take samples from the Qt project. Introduction It was not accidentally that I...
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Here is the code which displays the Calendar of the month entered by the user. #include<stdio.h> #include<conio.h> #define Y 1900 /*1/1/1900 monday*/ void days(int *,int *); void display(int *, int);
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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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