i++和++i

// i = i++ 计算过程
	// temp = i;
	// i = i+1;
	// i = temp;

	// i = ++i 计算过程
	// i = i+1;
	// temp = i;
	// i = temp;

	int x = 0;
        //输出5个0
	for (int i = 0; i < 5; i++)
	{
	    x = x++;
	    System.out.println(x);
	}

	x = 10;
	x = x++ + x++;
	// temp1 = x; x= x+1; temp2=x; x=x+1; temp1+temp2
	System.out.println(x); //21
	
	x = 10;
	x = ++x + ++x;
	// x=x+1; temp1=x;x=x+1;temp2=x;temp1+temp2
	System.out.println(x); //23