C Programming Tutorials

C Programming Tutorials And Articles
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Introduction A lot of us use TC in our colleges. Today I will share with you Two ways to have fun in lab with your teachers. ;) Background Trick I In the first way, you will create an error in any wokring code just by adding one or more numeric letter in it. There will be only one...
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As the name suggests, volatile specifier indicates the compiler that the value of the variable is volatile i.e. it can change unexpectedly. But, the question comes why do we need to even specify that a variable value is volatile. The Requirement for volatile specifiers Our compilers...
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Program prints the month without using any system related information but just making some simple calculations of days from the reference day 1/1/1900 as Monday. #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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After writing Why main() should not have void as return type? article the other day, suddenly one more question came up into my mind about the signature of main() function. In the earlier article I discussed about why 'void main()' should not be used when ANSI C expects the function main() to...
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Function is a block of statements that performs a specific task. It is reusable portion of the code and a very effective way to modularize your program. For example, you may need to perform different arithmetic operations in your program like addition, subtraction, multiplication and division....
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Pointer Pointer is a declared like a variable, but it's not an ordinary variable, it's a fancy variable, that can store address of the another variable. Pointer is very much useful for allocating memory at run time , that's dynamic allocation. Pointers are said to "point to" the variable whose...
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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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This is the code I wrote in my college days and dont quote me on this if something does not go as expected. #include<stdio.h> #include<ctype.h> #include<conio.h> void main() { int c,i,letter;
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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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The below program calculates the largest no among the no entered but it just calculates as user inputs them. This can be used with files and as you move ahead in file you can store the max and the min value in a variable when parsing the file. #include<stdio.h> int largest(int,int); void...
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Array is a data structure consists of a group of elements of same data type. We can think it as collection of variable of similar data type. Array prototype: Data_type array_name Example: Suppose you have a team of 10 employees. Id is given for every employee. You want to store id, age...
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Conditional statements are statements, which are executed depending on some condition being satisfied as true or false. In this tutorial, we will try to learn some conditional statements which include: If-else, switch, break and continue which controls the behaviour of loop to some extent. if...
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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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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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In this article, we will discuss different implementations of sleep functions that had flaws to understand how sleep function evolved. Before discussing the sleep function implementations, lets first understand briefly the following two functions : alarm() function From Linux Man page : ...
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Code for Integer Into Words #include<stdio.h> void main() { long int n,t; char a={" ","One","Two","Three","Four","Five","Six","Seven","Eight","Nine","Ten"}; char b={" "," ","Twenty","Thirty","Forty","Fifty","Sixty","Seventy","Eighty","Ninety"}; char c={"...
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In this article we will extend our code to print more comprehensive information about a file/directory in a directory. Please Refer Developing Linux Utility like 'ls' in C Developing Linux Utility - Part II Arranging Output in Alphabetical Order Example $ ls -l total 148 ...
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Environment variables can be thought of as a name value pair that affect the behavior of the processes running on an operating system. For example, to know the value of environmental variable PATH in my system, I do : -laptop ~ $ echo $PATH ...
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We will discuss the concept of Macros. A Macro is a name given to a piece of code or to a value. Whenever the macro is used in the code, it is replaced by its value at the very first stage (preprocessing stage) of compilation process. They are defined using '#define' directive. For...
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This time we checked Apache HTTP Server with PVS-Studio. As we had expected, we found errors there. The errors are few. We expected this either. Other developers come across this situation too while testing PVS-Studio on their projects. Unfortunately, the first conclusion you would like to draw...
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