C++编程基础一 30-逻辑表达式（逻辑运算符）

// 30-逻辑表达式（逻辑运算符）.cpp: 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <iostream>
#include <climits>
#include <array>
#include <math.h>
#include <string>
using namespace std;

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

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

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

    bool res5 = 4 == 4 && 3 == 3;  //只有两边同时为true时才为true，其他的都是false
    bool res6 = 8 == 8 && 6 == 3;
    bool res7 = 5 > 4 && 3 > 9;
    bool res8 = 4 > 8 && 5 < 10;
    bool res9 = 3 < 9 && 2 > 9;
    cout << res1 << " " << res2 << " " << res3 << " " << res4 << " " << res5 << endl;//1 1 0 1 1

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

    //?: 条件运算符、
    //表达式1 ? 表达式2 : 表达式3 ; 当表达式1结果为true时，执行表达式2，当表达式1结果为false时，执行表达式3.
    int i = true ? 100 : 90;
    cout << i << endl;

    int vvip = 1;
    string res = vvip == 1 ? "有优惠" : "正常价格";
    cout << res << endl; //返回 有优惠

    int vvvip = 1;
    vvvip == 1 ? cout<<"有优惠" : cout << "正常价格"; //除了接语句外还可以接表达式

    int t;
    cin >> t;
    return 0;
}