| | 或运算 满足一个条件

&&与运算 要同时满足两个条件

! 相反de

!true 取反 为false

#include <iostream>
using namespace std;

int main()
{
// || 或
/*int vip = 1;
if(vip==1 || vip==2)
{
cout<<"获得优惠";
}*/

//bool res1 = true || false; // 1
//boo res2 = false || true; // 1
//bool res3 = false || false; // 0
//bool res4 = true || true; // 1
//cout<<res1<<" "<<res2<<" "<<res3<<" "<<res4<<endl;

//bool res1 = 4==4 || 4==9; // 1
//bool res2 = 9>0|| 3>4; // 1
//bool res3 = 2<8 || 3<9; // 1
//bool res4 = 5<3 || 9<7; // 0
//cout<<res1<<" "<<res2<<" "<<res3<<" "<<res4<<endl;

// && 与
//int age = 20;
//if(age>=18 && age<=30)
//{
//cout<<"你是青年"<<endl;
//}

//bool res1 = 4==4 && 3==3; // 1
//bool res2 = 8==8 && 6==4; // 0
//bool res3 = 5>4 && 3>9; // 0
//bool res4 = 4>8 && 5<10; // 0
//bool res5 = 3<9 && 2>9; // 0
//cout<<res1<<" "<<res2<<" "<<res3<<" "<<res4<<" "<<res5<<endl;

// !
//cout<<!true<<endl; // 0
//cout<<!(10>9)<<endl; // 0

// && and    || or     ! not


return 0;
}