Basic multi module problem


 
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# 8  
Old 05-28-2007
Quote:
Originally Posted by enuenu
Thanks again. Further to this, why is "void" used as a parameter in a function that takes no arguments, i.e.
int main (void)

I see this a bit in C (I started out learning C++) , why not just use

int main()
?

Is main a special case, or do you always use void in this way in a function that takes no arguments?

Which of the following is correct in C?
myFunction(void)
OR
myFunction()
?
There is no need to put void as function arguements, but people do it anyway, probaly for clarifacation when others read their code. But remember that function(void) isn't required, but void function() is. The latter means a function without a return value.
# 9  
Old 05-28-2007
Quote:
Originally Posted by Octal
There is no need to put void as function arguements.
Not necessarily so...

In ANSI C, the following happens...

1. if the return type is empty it is considered an 'int'.

2. if the function has a void or a list of arguments those are the arguments that the compiler will check against.

3. if the argument list is empty it is effectively saying "I don't know what the arguments are" and you can call it with any arguments you like and may only get a warning. It is equivalent of ellipses, (...)

Code:
int myx()
{
	return 0;
}

int myz(void)
{
	return 0;
}

void myy()
{
	myx();
	myx(2);
	myx(3);
	myz();
	myz(1);
}

There may only be a warning only for the "myz(1)".
# 10  
Old 05-28-2007
Thanks a lot. I am a beginner as you can see. I am transitioning from fundamental C++ to fundamental C.
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