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Callback functions are extremely versatile, particularly in event-driven programming. When a specific event is triggered, a callback function mapped to it is executed in response to these events. This is typically used in GUI applications, an action like a button click can initiate a series of predefined actions. Callback Function The callback function is basically…

A function in C is a block of organized, reusable code that is used to perform a single related action. In any C program, there are one or more functions − classified as library functions and user-defined functions. There are two types of functions in C − Any C compiler (e.g. GCC compiler, Clang, MSVC compiler, etc.)…

Variadic functions are one of the powerful but very rarely used features in C language. Variadic functions add a lot of flexibility in programming the application structure. Variadic Function in C A function that can take a variable number of arguments is called a variadic function. One fixed argument is required to define a variadic function.…

The term nesting, in programming context refers to enclosing a particular programming element inside another similar element. Just like nested loops, nested structures, etc., a nested function is a term used to describe the use of one or more functions inside another function. What is Lexical Scoping? In C language, defining a function inside another one…

There are two ways in which a function can be called: (a) Call by Value and (b) Call by Reference. In this chapter, we will explain the mechanism of calling a function by reference. Let us start this chapter with a brief overview on “pointers” and the “address operator (&)”. It is important that you…

In C language, a function can be called from any other function, including itself. There are two ways in which a function can be called − (a) Call by Value and (b) Call by Reference. By default, the Call by Value mechanism is employed. Formal Arguments and Actual Arguments You must know the terminologies to…

In a C program, the main() function is the entry point. The program execution starts with the main() function. It is designed to perform the main processing of the program and clean up any resources that were allocated by the program. In a C code, there may be any number of functions, but it must have a main() function. Irrespective of its place…

A function in C is a block of organized reusuable code that is performs a single related action. Every C program has at least one function, which is main(), and all the most trivial programs can define additional functions. When the algorithm of a certain problem involves long and complex logic, it is broken into smaller,…

What is goto Statement in C? The goto statement is used to transfer the program’s control to a defined label within the same function. It is an unconditional jump statement that can transfer control forward or backward. The goto keyword is followed by a label. When executed, the program control is redirected to the statement following the label.If the label points to…

The behaviour of continue statement in C is somewhat opposite to the break statement. Instead of forcing the termination of a loop, it forces the next iteration of the loop to take place, skipping the rest of the statements in the current iteration. What is Continue Statement in C? The continue statement is used to skip the execution of the rest…