Thread: declair fucntions before main()?

Personal preference really, but if you code the function definitions after main then you will need to provide your function prototypes prior to using them. i.e. before main.

Here's an example to get you on your way. This is the way I was taught to do it. I like it; I use it; I suggest it.

Code:

#include <iostream>
using namespace std;

// Function prototypes
void Hello();
double Square(double x);
double Cube(double x);
void GoodBye();

int main()
{
	double x;
	Hello();
	cout << "Enter a number: ";
	cin >> x;
	cout << x << " squared is " << Square(x) << endl;
	cout << x << " cubed is " << Cube(x) << endl;
	GoodBye();
	return 0;
}

// Function implementations
void Hello()
{
	cout << "Hello.  Welcome to my program." << endl;
}

double Square(double x)
{
	return x * x;
}

double Cube(double x)
{
	return x * x * x;
}

void GoodBye
{
	cout << "Thank you for using this program.\nHave a nice day.";
}

I hope that helped

Since I usually think up my code on the spot, it would mess up my thought process if I used prototypes =I

It's easier without that extra step

I dont like to use prototypes. I feel they're a waste of time. I usually just define all my functions before main(). It seems to help organize the code a lot better since you dont have declarations and definitions all over the place.

Originally posted by Munkey01
But what if you want to call main() in the middle of your function, you would have to put the function prototype before the function that calls main(), right? Or is there another way?

What on earth—a function calling main?! Functions don't call main, so I'm not sure I understand your question.

Originally posted by Munkey01
But what if you want to call main() in the middle of your function, you would have to put the function prototype before the function that calls main(), right? Or is there another way?

Functions dont really call main(), man. If I understand what you're saying, I guess you could put prototypes before main(), and then define your functions afterward.

Originally posted by LordVirusXXP
Functions dont really call main(), man. If I understand what you're saying, I guess you could put prototypes before main(), and then define your functions afterward.

No, I think he really wants to call main() inside a function. He should refer himself to his sig

Code:

#include <iostream>

void function()
{
	std::cout << "Hello World!\n";
	return;

	std::cout << "You can put whatever you want here, because it won't show up";
}

int main()
{
	function();
	return 0;
}