【不用第三变量交换2个数】2024-10-18

缘由c语言不会教我吧真的不会_编程语言-CSDN问答

	int a = 0, b = 0; cin >> a >> b;
	if (a > b)
	{//缘由https://ask.csdn.net/questions/8153190/54892711
		a = a - b;
		b = b + a;
		a = b - a;
	}
	else
	{
		a = b - a;
		b = b - a;
		a = b + a;
	}
	cout << a << " " << b << "\n";

采用差的方式的优点是不会产生数据溢出错误。