C Programming Tutorials

C Programming Tutorials And Articles
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Port scanner in C #include<stdio.h> #include<sys/socket.h> #include<sys/types.h> #include<stdlib.h> #include<netdb.h> int main(int argc,char **argv) { int i,err,net; struct hostent *host;
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Introduction A command line argument is a parameter which is passed to a program at the time or instant when it is invoked or executed from the command line .This is accomplished by passing information to main() method of the program. It is the information that directly follows the program’s...
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The article explains why hashing have o(1) complexity. This article will clear your doubt that whay hashing has 0(1) time complexity but will not take you deeper . There are certain factors which can affect the time complexity like collision and performance of hashing depends on hashing algorithm....
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The other day I was working on a code where in I was doing some file related operations. I used the function feof() to test whether the end of file has been reached or not. I got into some trouble over the way I used this function in my code, after debugging a bit I found the problem. The problem...
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What is Dameon Process? A Daemon process is a process which is not associated with any terminal and hence is supposed to run in background. Since, a daemon process involves background processing, it is recommended it should not include any user interaction. Therefore, it should be clear about...
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When a process terminates abnormally it usually tries to send a signal indicating what went wrong. C programs (and UNIX) can trap these for diagnostics. Also user specified communication can take place in this way. Signals are software generated interrupts that are sent to a process when a...
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Relocating a node in the linked list is one of major operation and I have tried to simulate one type of movement. i.e. moving forward. node* MoveForward(node *current) { int rno; /* Roll number for moving of node */ int n; /* Number of nodes...
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Introduction The idea is simple just to test whether the expression contains correct sequence of brackets or not. void main() { char arr; char *top; int loop=0,i,l,binary;
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One of my friends, who is learning to program in C, asked me about how to write a program which checks an inputed string is a palindrome or not, without using the header file string.h So here's the solution. #include <stdio.h> void main(void) { char str; int len=0,i=0,j,flag=1;
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Program tells you the day of the date inputed. Remember when you copy the code paste in a file named *.c and not cpp file as that will cause an error. I have commented in the code where it will cause the error. #include<stdio.h> #include<conio.h> #include<time.h> #define AND && #define OR...
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Introduction This article explains what downcast are, how to make it safe, and so forth. However, before learning what downcast are, you must be familiar with polymorphism. Background Can you guess what is down-casting…yes it’s an opposite mechanism of up-casting. In upcast the...
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EIP ( Extended Instruction Pointer ) is a register that points to the next instruction...It simply points to the address in which that instruction is placed...So if we overwrite this we can change the direction flow of the program and make it do what we want.... In other words if we overwrite...
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Generally a question is asked that if you have given n bits then print out all the possible binary numbers of n bit and so I will try to explain how to get that done. Please don't Copy Paste. Understand The logic because it is useful in other problems as well for eg if n=1 then you can have 0...
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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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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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Suppose a system call was blocked due to some reason (like waiting for a read of some data on terminal) and during this time a signal occurs. Do you know what happens in this scenario? In this article we will discuss the impact of signals on system calls. System calls are different from...
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A lot many times you would have used a Linux command with some arguments to it. Like : cp -r /home/user/Desktop/abc /home/abcrm -rf abcIn the above examples, 'cp' or 'rm' are the name of binaries (written in 'C') while the rest of the stuff is the command line arguments to the respective...
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What is OpenGL? OpenGL is a set of standard API's for developing 2D and 3D graphics applications. The standard provides it in the form of a library which can be linked along wih your program (could be C/C++). OpenGL includes vast scope of API's which can be used to render figures, textures,...
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There are certain situations where you may want to limit your process's use of system resources like CPU or may want to put certain limitations on things like number of open file descriptors, maximum memory your process can allocate for its data etc. You may use commands like ulimit, sysconf etc to...
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This article is the Part-II (Part-I here) of the series where in we are focusing on good coding practices. In the Part-I we discussed the importance of the assert macro/function for detecting and debugging bugs in program. In this part we will focus on good coding practices while dealing with...
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