Basic Function Name

[atjm88]

#include <iostream>
#include <conio>

void printmessage ();

int main()
{
	printmessage();
   getch();
   return 0;
}

void printmessage()
{
	cout<<"I'm a function!";
}

Can I know the following answer?
1. Function Call
2. Function header
3. Function declaration in the program

And why need to use void? What different with int?

Thanks...

[gelatine]

what do you want to know from the first 3 things ?

and you have to use void because the function returns nothing.
if you return an integer you should write int.

[vlad from moscow]

Function call is the expression

printmessage();

There is no such termnin in the C/C++ as "function header".

And you have two function declarations in your program the second of them is also a definition.

First declaration:

void printmessage ();

Second declaration and simultaneously definition:

void printmessage()
{
	cout<<"I'm a function!";
}

You may rewrite your prograqm the following way

#include <iostream>
#include <conio.h>

using namespace std;

void printmessage()
{
	cout<<"I'm a function!\n";
}

int main()
{
   printmessage();

   getch();

   return 0;
}

[atjm88]

@gelatine
I wanted to know each of the 3 answer for the code above...

if you return an integer you should write int.

What u mean by "return"? Is that all the program related to number must use a int instead of void? But why line 6 use int main() since it also don't play with value? TQ...

@vlad from moscow
Thanks for the 1 and 3 and a modified arrangement, actually that's a simple program I got from C++ book, but then it ask for that 3 answer...so I think there should have answer for 2 is it? TQ...