[Home]  [Edit this page]  [Recent Changes]  [Special Pages]  [Help] 

---

CVoid

---

(C) void

Keyword denoting that either

• The function returns nothing
• The function takes no arguments
• The function returns a  ?pointer of unknown type.

The function returns nothing

void sayHello()
{
  printf("Hello world");
}

The function takes no arguments

(From the C++ MessageBoard, http://www.programmersheaven.com/c/MsgBoard/read.asp?Board=3&MsgID=339047&Setting=P0030F0001, thanks to stober)

In C, int myFunction(void); is the declaration of a function taking no arguments. In C++, int myFunction(); is preferred (see below) to specify this. In C, however, there is a difference between the two, as in C, int myFunction(); denotes a function declaration taking ANY number of unspecified parameter.

Here a (modified) example submitted by stober:

void func1();
void func2(void);
int main(void)
{
  int a = 0;
  int b = 0;
  func1();
  func1(a);  
  func1(a,b);
  func2(a); //Error on this line! func2 has no arguments!
}

The function returns a pointer of unknown data type

void* someFunction();

( Sorry, I haven't got a better example. I need to look in some Win32 API programming for one).

Avoid  ?void* except in low-level code.

See  ?void* for more details.

'void' links

• C++
• C#

[Edit this page]  [Page history]  [What links here]  [Discuss this topic]  [Printer Friendly]