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What is A Void Function In The C Programming language?

What is A Void Function In C Programming

C is one of the most popular and powerful programming languages. Did you know that C code can be edited and run by a C++ IDE and compiler? The C language has many pre-defined variables, functions, and libraries – and while this makes it very powerful it can also be a steep learning curve for new programmers. Using a fast and reliable C or C++ compiler for Windows is very important for beginners and professionals since it helps C/C++ developers in remembering which language features exist, how to use them, and even detect errors when we get them wrong which helps beat that barrier to learning and improving.

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What is a void function in C programming?

In C and C++ programing, the void term means “no value is returned”. In math, a function returns a value, i.e. y = f (x); Here f(x) is a function that works with variable x and y is the output of this function. Note that, in English, void term means “completely empty” or “not valid or legally binding”.

In programming, generally a function returns a value, but some functions do not need to return a value. These functions can carry out all sorts of operations and run many other functions inside but when it is over it should not have to return a value. We call these functions “void functions”. To define a void function, we should start with the keyword void which represents this function has no possible return value.

How do I declare a void function in C++?

For example, we want to create some code that promotes the LearnCPlusPlus site on the screen we might decide we don’t really need a return value from this function. In C++, this function should be defined as a void function as below,

How do I declare a void function in C?

In C programming, you don’t need to define as void, for example this is a void function in C language,

For the compatibility, we highly recommend you to use void term for all C and C++ function definitions.

We can easily use this void function as below,

Do void functions have return values in C++ or C?

At the end of void functions, you don’t need to (and shouldn’t) use the return command as there is no return value. Even without the return statement, control will return to the caller automatically at the end of the function.

Can void functions in C and C++ have parameters?

Yes, void functions may have parameters just like any regular function. For example, this analyze() function is a void function that has parameters.

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There is a free C++ Builder Community Edition for students, beginners, and startups; it can be downloaded from here. For professional developers, there are Professional, Architect, or Enterprise versions of C++ Builder and there is a trial version you can download from here.

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About author

Dr. Yilmaz Yoru has 33+ years of coding with more than 30+ programming languages, mostly C++ on Windows, Android, Mac-OS, iOS, Linux, and some other operating systems. He was born in 1974, Eskisehir-Turkey, started coding in college and graduated from the department of Mechanical Engineering of Eskisehir Osmangazi University in 1997. He worked as a research assistant at the same university for more than 10 years. He received his MSc and PhD degrees from the same department at the same university. Since 2012, he is the founder and CEO of Esenja LLC Company. He has married and he is a father of a son. Some of his interests are Programming, Thermodynamics, Fluid Mechanics, Artificial Intelligence, 2D & 3D Designs, and high-end innovations.
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