Thread: "void"

hey, I'm back y'all
I got this question about "void". My book, which I like, is by some Herbert Schildt guy where I teach myself C.

He said this: "
If a function does not return a value, then it's type should be 'void"

See, now he used a function that only printed a statement out
like this

Code:

void myfunc (void)
{
printf ("this is a test.");
}

ok, now it does "return" that statment in the " ", but what does that mean. I understand some functions I create will punch out some number to be used by the program, so that would have to be something other than a "void" return type. So is it that "void" is basically used for functions or statement return-types?

just getting familiar. and if you could explain the "(void)", aka the "parameter-list", that would be cool too. thanks, I'll get back to my book.
listening to some old school michael jackson while I do this, that guy used to be a monster in music, tore it up.

see, check this, this is why I may not be understanding something. All this program does is covert your dollar amount you put in to pounds using a conversion factor of 2$ per pound(britain money type, in case someone don't know).

Code:

#include <stdio.h>

 int convert(void);

int main(void)
{
  int pounds;
  
  pounds = convert();
  printf( "That is %d pounds\n", pounds );
  
  return 0;
  }
  
  int convert(void)
  {
  int money, pounds;
  
  printf( "Enter your dollars ");
  scanf( "%d", &money );
  return money/2;
  }

see, well I just don't get it, there is a void for the parameteres of the function. I am having trouble understanding that in my mind, because it looks like my convert() function I made does return a value, that is, it returns "money/2"
I though void was only ok to use when you are NOT returning a value. Hmmm, I am very picky but I need to know and understand, thanks in advance peeps.

Type void can also be used with variables. For example

void *ptr;

declares a void-pointer. Such a pointer can be used to point to all other datatypes, therefore it is usually called a general pointer.

icarus(sounds like a video game name, I like it)

where is the link to what you are talking about here, I will maybe check out the tutorials on this site too

"This might be a good time to read the FAQ if you haven't done so already, especially the part about int main() vs void main(). It'll save you getting mocked unmercifully later on"