#include <iostream>
using namespace std;
/* run this program using the console pauser or add your own getch, system("pause") or input loop */

void show_value(int a);
void show_address(int * p);

int main(int argc, char** argv) 
{
	int a1 = 10;
	int * p1;
	p1 = &a1;
	
	//1.函式的傳值呼叫
	cout<<"(before) a1 = "<<a1<<endl;
	show_value(a1);	
	cout<<"(after) a1 = "<<a1<<endl;
	cout<<endl;
	
	//2.函式的傳址呼叫
	cout<<"(before) a1 = "<<a1<<endl;
	show_address(p1);	
	cout<<"(after) a1 = "<<a1<<endl;
	
	
	return 0;
}

///////////////////////// 
void show_value(int a)
{
	a +=100;
	cout<<"(inside function) a = "<<a<<endl;	
}

////////////////////////
void show_address(int * p)
{
	*p += 500;
	cout<<"(inside function) *p = "<<*p<<endl;
 }