See also. You will learn more about return values later in this chapter You will learn more about return values later in this chapter Note: In C#, it is good practice to start with an uppercase letter when naming methods, as it makes the code easier to read. Declaration. void main – The ANSI standard says "no" to the ‘void main’ and thus using it can be considered wrong. If a function is defined as “ void ” it does not need to return a value. You cannot use void as the type of a variable. Functions 2: Void (NonValue-Returning) Functions. Definition of C Void Pointer. Following is the declaration for memchr() function. For more information, see Pointer types. Void (NonValue-Returning) functions: Void functions are created and used just like value-returning functions except they do not return a value after the function executes. The C library function void *memchr(const void *str, int c, size_t n) searches for the first occurrence of the character c (an unsigned char) in the first n bytes of the string pointed to, by the argument str. A void pointer in C clearly indicates that it is empty and can only capable of holding the addresses of any type. The void keyword has a third (more advanced) use in C++ that we cover in section 9.20 -- Void pointers. Since we haven’t covered what a pointer is … For example (for our purposes), the printf function is treated as a void function. The reason for this is simple: malloc returns void* and not int*.While in C it's legal to assign void* to int* without a cast, in C++ it isn't.. Why the difference? Void means nothing. One should stop using the ‘void main’ if doing so. Void functions are mostly used in two classes of functions. Such functions return control automatically when they reach the end of their body. One should stop using the ‘void … Further, these void pointers with addresses can be typecast into any other type easily. C# reference; System.Void You can also use void as a referent type to declare a pointer to an unknown type. void means that this method does not have a return value. In lieu of a data type, void functions use the keyword "void." Home » C » Pointer » Void Functions in C. ... ("You need a compiler for learning C language.\n"); } The first line in the above definition may also be written as. A void pointer in C is a pointer that does not have any associated data type. Well, let us start with C. 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