c - OpenGenus IQ

Understanding and working with Memset in C

memset is a memory utility in C which is used to set a particular value to a range of memory locations in an efficient way. On going through this article, you will understand How to use memset? and Why performance of memset is better than a simple implementation?

software engineering

Working with Typedef in C

typedef is a keyword in C programming language,which stands for type definition. How to use typedef? Why and when to use typedef? Difference between typedef and define

software engineering

Working with boolean (bool) in C

The C programming language, as of C99, supports Boolean data type and arithmetic. In C, boolean is known as bool data type. To use boolean, a header file stdbool.h must be included to use bool in C.

software engineering

Working with character (char) in C

C uses char type to store characters and letters. However, the char type is integer type because underneath C stores integer numbers instead of characters. Characters supported by a computing system depends on the encoding supported by the system.

software engineering

Representing Strings in C

Compared to other languages, C is a low-level language. It does not have any specific data-type specific for a String. Since there is no built-in data-type in C language for String, it is handled using an array of characters. A String in C can be defined as an array of characters.

c

Union in C

A union is a special data type available in C that allows to store different data types in the same memory location. You can define a union with many members, but only one member can contain a value at any given time. Unions provide an efficient way of using the same memory location for multiple use

c

do while loop in C

Do while loop in C is an exit controlled loop and hence, it executes at least once even when the test-expression is false initially. We illustrate the concept and usage in C with different examples

c

While loop in C

Order execution of while loop in C is control variable is initialized, test expression is evaluated, if it evaluates to true, the loop enters the body and it is repeatedly executed, till the expression does not evaluate to false. When the test expression evaluates to false, the loop is exited.

c

continue statement in C

The continue statement is a jump statement in C. It is another one of the jump statements like the break statement as both the statements skip over a part of the code. But the continue statement is somewhat different from the break statement. It forces the next iteration of the loop to take place

c

Storage classes in C

A Storage Class defines the scope (visibility) and life-time of variables and/or functions within a C Program. They precede the type that they modify. Storage classes are used in C programming are Automatic variables (auto), External variables (extern) Static variables (static) and Register variable

c

Dynamic memory allocation in C

The process of allocating memory at run time is known as dynamic memory allocation. Although C does not inherently have this facility, there are four library routines that can be used for allocating and freeing memory during program execution: malloc, calloc, realloc and free

c

Static memory allocation in C

In C, the default way of memory allocation is static. Static memory allocation is an allocation technique which allocates a fixed amount of memory during compile time and the operating system internally uses a data structure known as Stack to manage it We define static variables and how to delete it

software engineering

goto statement in C

The goto statement is a jump statement which is sometimes also referred to as unconditional jump statement. The goto statement can be used to jump from anywhere to anywhere within a function. The use of goto statement is highly discouraged and can be avoided using break and continue statements.

software engineering

Break Statement in C

Break Statement is a loop control statement which is used to terminate the loop. As soon as the break statement is encountered from within a loop, the loop iterations stops there and control returns from the loop immediately to the first statement after the loop. break can be used in all loop

software engineering

Error Handling in C

In C when some error occurs then -1 or NULL value is returned and a global variable errno is set with the error code.Hence we use returned values to check errors. We use EXIT_SUCCESS ,EXIT_FAILURE to deal with errors. There are three types of errors syntax, logical and semantic.

software engineering

Functions in C

A function in C is a set of statements that take inputs, do some specific computation and produces output. The idea is to put some commonly or repeatedly done task together and make a function, so that instead of writing the same code again and again for different inputs, we can call the function.

software engineering

An in-depth look into Recursion in C

Recursion is a coding technique/ design in which a function calls itself directly or indirectly and the corresponding function is called as recursive function. Using this many problems can be solved easily with less time. C, C++, Java, Python, Go and others support Recursion except Fortan 77

software engineering

malloc vs calloc vs realloc

We take a deep look into the 3 dynamic memory allocation techniques in C/ C++ namely malloc, calloc and realloc and explore the difference. malloc stand for memory allocations, calloc for contiguous allocation and realloc for re-allocation.

software engineering

for loop in C

Loop is a programming concept which is natively supported by C. Loops are used to repeat a particular coding task where each repetition follows a particular pattern which can be incorporated in a code. Example of such a task is printing integers from 1 to 10.

software engineering

Integer datatype in C: int, short, long and long long

In C programming language, integer data is represented by its own in-built datatype known as int. It has several variants which includes int, long, short and long long along with signed and unsigned variants The size of int is 4 bytes and range is -2147483648 to 214748364 long long is of 16 bytes

c

Multithreading and pthread in C

In this article, we have explored how the pthread library in C can be used to implement concepts of multithreading. A thread is a single sequence stream within in a process.

c

Semaphore in C

Semaphore is a data handling technique which is very useful in process synchronization and multithreading. We used the POSIX semaphore library and use the functions sem_wait, sem_post, sem_open and sem_init for implementing semaphore in C.

software engineering

Implementing printf and scanf in C

Understanding how printf and scanf works internally is the key to writing advance code. Key concepts involved are variable number of arguments in functions using vararg in C. Use of internal buffer to prepare the input or output.