#include<iostream>
using namespace std;

int main()
{ 
	cout << "hello C++" << endl;

	system("pause");

	return 0;

}

#include<iostream>
using namespace std;

#define Day 7//注意，后面不能加",",否则报错

int main()
{ 
	cout << "一周总共有："<<Day << "天" << endl;
	system("pause");
	return 0;
}

#include<iostream>
using namespace std;

#define Day 7//注意，后面不能加",",否则报错

int main()
{ 
	
	//整型：short（2）、int（4）、long（2）、long long（8）

	short num1 = 10;
	cout << "short占用内存空间为：" << sizeof(num1) << endl;
	//cout << "short占用内存空间为：" << sizeof(short) << endl;//效果相同
	system("pause");

	return 0;
}

#include<iostream>
using namespace std;

#define Day 7//注意，后面不能加",",否则报错

int main()
{ 
	int a = 0;				//赋初值，注意变量类型
	cout << "请给整型变量a赋值：" << endl;
	cin >> a;				//注意，右方向
	cout << "整型变量a = ：" << a << endl;
	
	system("pause");

	return 0;
}

#include<iostream>
using namespace std;
#include<string>//包含字符串的头文件

#define Day 7//注意，后面不能加",",否则报错

int main()
{ 
	string str = "hello";								//赋初值，注意变量类型
	cout << "请给字符串 str赋值" << endl;
	cin >> str;								//注意，右方向
	cout << "字符串str = " << str << endl;
	
	system("pause");

	return 0;
}

#include<iostream>
using namespace std;
#include<string>//包含字符串的头文件

#define Day 7//注意，后面不能加",",否则报错

int main()
{ 
	//选择结构 单行if语句
	//用户输入分数，如果分数大于600，视为考上一本，在屏幕上输出

	//1、用户输入分数
	int score = 0;
	cout << "请输入一个分数:" << endl;
	cin >> score;
	//2、打印用户输入的分数
	cout << "您输入的分数为：" << score << endl;
	//3、判断分数是否大于600，若大于，则输出
	if (score > 600)
	{
		cout << "恭喜您考上了一本大学" << endl;
	}
	
	system("pause");

	return 0;
}

#include<iostream>
using namespace std;

int main()
{ 
	//1、用户输入三只小猪的体重
	int A = 0; int B = 0; int C = 0;
	cout << "请输入A猪的重量（KG）:" << endl;
	cin >> A;
	cout << "请输入B猪的重量（KG）:" << endl;
	cin >> B;
	cout << "请输入C猪的重量（KG）:" << endl;
	cin >> C;
	//2、先判断A和B谁重，若A重，A与C比较，若A重，则A最重
	//3、先判断A和B谁重，若A重，A与C比较，若C重，则C最重
	//3、先判断A和B谁重，若B重，B与C比较，若B重，则B最重
	//3、先判断A和B谁重，若B重，B与C比较，若C重，则C最重
	cout << "A猪重:" << A << endl;
	cout << "B猪重:" << B << endl;
	cout << "C猪重:" << C << endl;
	if (A > B)
	{
		if (A > C)
		{
			cout << "A猪最重:" << endl;
		}
		else
		{
			cout << "C猪最重:" << endl;
		}
	}
	else
	{
		if (B > C)
		{
			cout << "B猪最重:" << endl;
		}
		else
		{
			cout << "C猪最重:" << endl;
		}
	}
	
	system("pause");

	return 0;
}

#include<iostream>
using namespace std;

int main()
{ 
	//创建三个变量 a b c
	//将a和b作比较，将变量大的赋值给变量c

	int a = 10; int b = 20; int c = 0;

	c = (a > b ? a : b);//a>b若为真，取a，若为假，取b
	(a > b ? a : b) = 100;//a和b谁赋值通过a>b来判断

	cout << "a = " << a << endl;
	cout << "b = " << b << endl;
	
	system("pause");

	return 0;
}

#include<iostream>
using namespace std;
//time系统时间头文件包含
#include<ctime>

int main()
{
	//添加随机数种子，利用当前系统时间生成随机数，防止每次随机数都一样
	srand((unsigned int)time(NULL));
	//1、系统生成随机数
	int player = 0;
	int num = rand() % 100 + 1;	//rand()%100生成一个0~99的随机数(伪随机)
	cout << num << endl;
	//2、玩家进行猜测
	while (1)
	{
		cout << "请输入您的猜测值(整数)" << endl;
		cin >> player;
		//3、判断玩家猜测
		if (num == player)
		{
			//4、猜对，退出
			cout << "猜对了，您太棒了" << endl;
			break;
		}
		else
		{
			//5、猜错，提示猜的结果是过大或国小，重新返回2
			if (num > player)
			{
				cout << "猜测值偏小，加油" << endl;
			}
			else
			{
				cout << "猜测值偏大，加油" << endl;
			}
		}
	}
		
	system("pause");

	return 0;
}

#include<iostream>
using namespace std;

int main()
{
	//水仙花数
	//1、打印所有三位数
	int num = 100;
	do
	{
		//2、从所有三位数中找到水仙花数
		int a = num % 10;	//个位
		int b = num/10 %10;	//十位
		int c = num/100;	//百位
		if (a*a*a + b*b*b + c*c*c == num)
		{

			cout << num << endl;
		}
		
		num++;
	} while (num < 1000);
			
	system("pause");

	return 0;
}

#include<iostream>
using namespace std;

int main()
{
	//敲桌子
	for (int i = 1; i < 101; i++)
	{
		//个位数7，十位数7，7的倍数
		if (i%10 == 7 || i/10%10 ==7 || i%7 ==0)
		{
			cout << "敲桌子" << endl;
		}
		else
		{
			cout << i << endl;
		}
	}
			
	system("pause");

	return 0;
}

#include<iostream>
using namespace std;

int main()
{
	//利用嵌套循环实现星图
	for (int i = 0; i < 10; i++)
	{
		//外层执行一次，内层执行一周
		for (int j = 0; j < 10; j++)
		{
			cout << "* " ;			//”*+空格“
		}
		cout << endl;				//回车换行
	}
			
	system("pause");

	return 0;
}

#include<iostream>
using namespace std;

int main()
{
	//乘法口诀表
	for (int i = 1; i < 10; i++)
	{
		for (int j = 1; j <= i; j++)		//打印的列数小于行数！！！
		{
			int product = i * j;
			cout << j << "*" << i << "=" << product <<" ";
		}
		cout << endl;
	}
			
	system("pause");

	return 0;
}