// call by value en call by reference



#include <iostream>

using namespace std;



// Voorbeeld call by value:

void skipLines(int l) {

	while (l-- > 0)

		cout<<endl;

}



// Voorveeld call by reference (met behulp van een pointer): 

void swapInts1(int* p, int* q) {

	int t(*p);

	*p=*q;

	*q=t;

}



// Voorveeld call by reference (met behulp van een reference): 

void swapInts2(int& p, int& q) {

	int t(p);

	p=q;

	q=t;

}



int main() {

	int n(7);

	cout<<"Hallo"<<endl;

	skipLines(n);

	cout<<"daar!"<<endl;

	skipLines(3);



	int m(3);

	cout<<"n = "<<n<<" m = "<<m<<endl;

	swapInts1(&n, &m);

	cout<<"n = "<<n<<" m = "<<m<<endl;

	swapInts2(n, m);

	cout<<"n = "<<n<<" m = "<<m<<endl;

	

//	swapInts2(n, 5);

//	[C++ Error (Borland)]:    Reference initialized with 'int', needs lvalue of type 'int'

//	                          Type mismatch in parameter 'q' (wanted 'int &', got 'int')

//	[C++ Error (gcc)]:        invalid initialization of non-const reference of type 'int&' from a temporary of type 'int' in passing argument 2 of `void swapInts2(int&, int&)'

//	[C++ Error (Visual C++)]: 'swapInts2' : cannot convert parameter 2 from 'int' to 'int &'

//	cout<<"n = "<<n<<endl;



	cin.get();

	return 0;

}