||短路特性

#include<iostream>

using namespace std;

void main()
{
	int x, y, t;
	t = 3;
	x = y = 2; 
	t = x++ || ++y;
	cout << "x= " << x << endl;
	cout << "y= " << y << endl;
	cout << "t= " << t << endl;
	system("PAUSE");
}

结果：

x = 3

y = 2

t = 1

|| 逻辑或运算，左式为真右式不会执行。x++为真，y++便不会执行了。