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

int main(int argc, char** argv) {
	//目的：比較：a++，++a在運算式中代表的不同意義
	 
	//1.運算式1 
	int a1 = 3;
	int b1 = 6;
	a1 = a1 + 1;
	int c1 = a1 + b1;
	cout<<"a1 = "<<a1<<endl;
	cout<<"c1 = "<<c1<<endl;

	//2.運算式2 
	int a2 = 3;
	int b2 = 6;	
	int c2 = a2 + b2;
	a2 = a2 + 1;
	cout<<"\na2 = "<<a2<<endl;
	cout<<"c2 = "<<c2<<endl;
	
	//3. ++a（先做a=a+1) 
	int a3 = 3;
	int b3 = 6;	
	int c3 = ++a3 + b3;
	cout<<"\na3 = "<<a3<<endl;
	cout<<"c3 = "<<c3<<endl;

	//4. a++（後做a=a+1)
	int a4 = 3;
	int b4 = 6;	
	int c4 = a4++ + b4;	
	cout<<"\na4 = "<<a4<<endl;
	cout<<"c4 = "<<c4<<endl;

	return 0;
}