工作之余学习的，内容不多，只是作为一位朝圣者进行学习，望能与诸位多多交流，提高自身产能，提升自我。

using System;

namespace Hello_tomorrow { internal class Program { static void Main(string[] args) { int day = 12; int today; today = day++;//today = day++--先使用将day赋值给today,在自增;若today = ++day --先自增后使用； Console.WriteLine("day={0},today={1}", day, today);

//自减运算符
        //int apples = 10;
        //apples--;//等同于-apples=apples -1;
        //Console.WriteLine("还剩{0}个",apples);

        //自加运算符
        //int myAge = 24;
        //Console.WriteLine("今年我{0}岁", myAge);
        //myAge++;//等同于-myAge=myAge +1;
        //Console.WriteLine("明年我{0}岁", myAge);

        /*已知华氏温度和摄氏温度的转换公式：
           摄氏温度=（华氏温度-32）*5/9--C=(F-32)*5/9
        编写一个程序输入华氏温度，输出其摄氏温度*/
        //double F;
        //double C;
        //Console.Write("F=");
        //F = Convert.ToDouble(Console.ReadLine());
        //C = (F - 32) * 5 / 9;
        //Console.WriteLine("C=" +C);

        //int a = 9;
        //Console.WriteLine(Math.Sqrt(a));

        //取余运算%（取模）
        //int a=9, b = 2;
        //Console.WriteLine(a % b);

        //double x;
        //double y;
        //Console.Write("x=");
        //x = Convert.ToDouble (Console.ReadLine());
        //y = x * x * x + 3 * x * x - 24 * x + 30;
        //Console.WriteLine("y=" + y);

        //int x = 10 / 3;
        //double y = 10 / 3;
        //double z = 10.0 / 3;
        //Console.WriteLine("x={0}", x);
        //Console.WriteLine("y={1}", y);
        //Console.WriteLine("z={2}", z);

        //北京奥运会的开幕日期是2008年8月8日，那么这天是星期几？
        //y-年 m-月 d-日
        //int y = 2008;
        //int m = 8;
        //int d = 8;
        ////以下是吉姆拉尔森公式。
        //int week = (d + 2 * m + 3 * (m + 1) / 5 + y + y / 4 - y / 100 + y / 400 + 1) % 7;
        //Console.WriteLine("2008.8.8是星期{0}", week);

        //int a = 5;//a=5,b=/,t=/
        //int b = 2;//a=5,b=2,t=/
        //int t;//空桶法//a=5,b=2,t=/
        //t = a;//a=5,b=2,t=a=5
        //a = b;//a=2,b=2,t=5
        //b = t;//a=2,b=5,t=5
        //Console.WriteLine("a=" + a);
        //Console.WriteLine("b=" + b);

        //const double pi = 3.1415926;
        //double r = 7;
        //double area1 = pi * r * r;
        //double area2 = 2 * pi * r;
        //Console.WriteLine("{0}\n{1}", area1, area2);

        //double pi = 3.1415926;
        //Console.WriteLine("{0:#.00}", pi);
        //Console.WriteLine("{0:#.000}", pi);
        //Console.WriteLine("{0:#.0000}", pi);
        //Console.WriteLine("{0:#.00000}", pi);

        //int number = 100;
        //Console.WriteLine("The number is " + number);
        //Console.WriteLine("The number is {0}", number);//{0}-占位符

        ////格式控制符
        //int i = 215;
        //int j = 85;
        //Console.WriteLine("{0}+{1}={2}", i, j, i + j);
        //Console.WriteLine("{0,6}\n+{1,5}\n------\n{2,6}\n",i,j,i+j);
        //decimal i1 = 19.23m;
        //decimal j1 = 73.7m;
        //Console.WriteLine("{0,8:C2}\n+{1,7:C2}\n---------\n{2,8:C2}", i1, j1, i1 + j1);//{0,8：C2}-{参数索引，数值宽度：货币格式小数位数}

        //string name = "张三";
        //char sex = '男';
        //int age = 18;
        //Console.WriteLine("姓名：{0}\n性别：{1}\n年龄：{2}", name, sex,age);



        //转义字符
        //Console.WriteLine("What is your name?\nMy name is Jack.");
        //Console.WriteLine("c\\windows\\fonts");
        //Console.WriteLine("小明说：\"我和他是朋友。\"");
        ////Console.WriteLine("\a好的");
        //Console.WriteLine("你叫什么名字？\t我叫夏文杰。");
        //Console.WriteLine(@"c\windows\fonts");

        //string mySentence = "Harvard is";
        //mySentence = mySentence + "ccccc";
        //Console.WriteLine(mySentence);

        //float pi = 3.14f;
        //Console.WriteLine("圆周率是：" + pi);



        ////把一个字符转化为整数，从而得到字符ASCII码
        //int code = (int)'A';//整数型转化字符型方法：在字符前面加（int）
        //Console.WriteLine("A->{0}", code);
        //char ch = (char)65;//字符型转化整数型方法：在整数前加（char）
        //Console.WriteLine("65->{0}", ch);
        ////用十六进制形式输出。
        //Console.WriteLine("\u0047\u006f\u006f\u0064\u0021");
        //Console.WriteLine("\u5c0f\u56ed\u9999\u5f84\u72ec\u5f98\u5f8a");

        //char tt = '玉';
        //int code10 = (int)tt;
        //string code16 = Convert.ToString(code10, 16);
        //Console.WriteLine("{0}的Unicode编码为：{1}", tt, code16);


        //数字的读取
        //根据圆的半径求面积
        //double r, s;
        //Console.Write("r=");
        //r = Convert.ToDouble(Console.ReadLine());//convert.todouble();
        //s = 3.14 * r * r;
        //Console.WriteLine("s=" + s);

        //字符的读取
        //Console.Read()用来读取一个字符。
        //Console.WriteLine("请输入一个字符：");
        //int ch = Console.Read();//输入一个字符，返回一个整型的ASCII编码。
        //Console.WriteLine("ASCII编码为：" + ch);
        //char tt = Convert.ToChar(ch);
        //Console.Write(tt);

        //字符串的读取
        //Console.Readline()用来读取一条字符串。
        //Console.WriteLine("请输入您的姓名：");
        //string name = Console.ReadLine();
        //Console.WriteLine("您的姓名是：" + name);

        //console.writeline()-自动换行
        //Console.WriteLine("山，");
        //Console.WriteLine("好美的风景.");
        ////console.write()-不换行
        //Console.Write("山，");
        //Console.Write("好美的风景.");

        /*字符型变量和字符串型变量的使用。*/
        //string mys;
        //mys = "How do you do";//这里加双引号-字符串变量
        //Console.WriteLine(mys);
        //mys = "I am fine";
        //Console.WriteLine(mys);

        //字符型变量用来存储一个字符，用关键字char声明
        //char mys;
        //mys = 'x';//这里是加单引号-字符变量
        //Console.WriteLine(mys);
        //mys = '2';
        //Console.WriteLine(mys);
        //mys = '#';
        //Console.WriteLine(mys);

        //Console.WriteLine('a');
        //Console.WriteLine("a");
        //Console.WriteLine('6');
        //Console.WriteLine("I Love you!");
        //观察程序，体验加引号和不加引号的区别
        //int balance = 100000;
        //Console.WriteLine("balance");//加引号的balance被看做文本，按原样输出
        //Console.WriteLine(balance);//不加引号的balance被看做变量，输出的是其整型数字100000

        //小明有44444.14元钱，小娟有66666.51元钱，计算他们共有多少钱。
        //float balanceofming = 44444.14f;//decimal虽然是财务计算但也是可以的，只是内存占用会变多。
        //float balanceofjuan = 66666.51f;
        //float total = balanceofming + balanceofjuan;
        //Console.WriteLine("合计:¥{0}",total);

        //float x = 3.14159265358979f;
        //double y = 3.14159265358979;
        //Console.WriteLine("x={0}", x);
        //Console.WriteLine("y={0}", y);

        //short a, b;
        //a = 32767;
        //b = (short)(a + 1);
        //Console.WriteLine("b={0}", b);//溢出                

        //将25489以二进制转换
        //Console.WriteLine(Convert.ToString(25489, 2));
        //int n;
        //n = 100;
        //n = 200;
        //n = n + 100;
        //Console.WriteLine(n);

        ////功能：求变量a,b的和、差、积、商。
        ////下面定义变量。
        //int a = 7;
        //int b = 2;
        //int sum, dif, pro, quo;
        ////下面进行计算。
        //sum = a + b;
        //dif = a - b;
        //pro = a * b;
        //quo = a / b;
        ////下面我们输出结果。
        //Console.WriteLine("{0}+{1}={2}",a,b,sum);
        //Console.WriteLine("{0}-{1}={2}",a,b,dif);
        //Console.WriteLine("{0}*{1}={2}",a,b,pro);
        //Console.WriteLine("{0}/{1}={2}",a,b,quo);

        //Console.WriteLine(Convert.ToString(89, 2));
        //Console.WriteLine(Convert.ToString(89, 8));
        //Console.WriteLine(Convert.ToString(8956, 16));
        //Console.WriteLine(Convert.ToInt32("110011", 2));
        //Console.WriteLine(Convert.ToInt32("567", 8));
        //Console.WriteLine(Convert.ToInt32("6F", 16));
        /*今天是我编写的第一个程序 
          我好高兴呀
          我要记住这个日子*/
        //以下是把hollowtomorrow！打印在控制台屏幕上。
        //Console.WriteLine("Hello Tomorrow!");
    }
}

}