#include <iostream>

using namespace std;

void callByValue(int a)
{
	a = 10;
	cout << "Inside callByValue: " << a << endl;
}

void callByReference(int &a)
{
	a = 10;
	cout << "Inside callByReference: " << a << endl;
}

void callByRef(int* a)
{
	*a = 10;
	cout << "Inside callByRef: " << *a << endl;
}

int main()
{
	cout << "Let start!\n";
	int i;

	i = 0;
	cout << "Before callByValue: " << i << endl;
	callByValue(i);
	cout << "After callByValue: " << i << endl;

	i = 0;
	cout << "Before callByReference: " << i << endl;
	callByReference(i);
	cout << "After callByReference: " << i << endl;
	
	i = 0;
	cout << "Before callByRef: " << i << endl;
	callByRef(&i);
	cout << "After callByRef: " << i << endl;
	return 0;
}