#include <iostream>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char** argv) {
//1.宣告變數 
	int a;
	int b=5;
	int c, d=7;
	std::cout<<a<<std::endl;
	std::cout<<b<<std::endl;
	std::cout<<c<<std::endl;
	std::cout<<d<<std::endl;

//2.宣告變數（專業命名） 
	int stu_number;
	int stuNumber;
	int int_stuNumber;
	
//3.變數的指派數值	
	a=100;
	b=50;
	c=20;
	d=1;
	
//4.變數的取值	
	c = a;
	d = b;
	std::cout<<a<<std::endl;
	std::cout<<b<<std::endl;
	std::cout<<c<<std::endl;
	std::cout<<d<<std::endl;
	
//5.常數const的設定（常數指定一次後，就已經是固定常數了，無法再被指派） 
	double pi1 = 3.14159;
	const double pi2 = 3.1415976;
	//pi2 = 3.14;
	
			
	 
	return 0;
}