//introduction of system fuction
using System;
//name space命名空间
//class
class MainClass
{
//main method
//A program starts with the main method and ends with the main method
//A program has only one main method
///
/// The entry point of the program, where the program control starts and ends.
///
/// The command-line arguments.
public static void Main (string[] args)
{
/*
* 多行注释中可以包含回车
*/
/*
//All the programs written earlier must be written in the main method
//在计算机中 最小存储单位 位 bit
//在计算机中 最小的使用单位 字节 Byte
//1字节 = 8位
//变量 就是一块内存
//创建变量: 从一整块内存中,获取一小块内存
//定义变量
//数据类型 变量名 = 值
//整型
//这里说的变量指的是 n1
int n1 = 10;
//如果想改变变量中的值
n1 = 20;
//系统提供的,作用将指定的数据输出到控制台
Console.WriteLine (n1);
//浮点型 单精度
float f1 = 2.1234567f;
Console.WriteLine (f1);
//浮点型 双精度
double f2 = 0.123456789123456789;
Console.WriteLine (f2);
//bool 布尔类型 true false
bool b1 = true;
bool b2 = false;
//字符类型
char c1 = 'a';
Console.WriteLine (c1);
//字符串 加双引号
string c2 = "Hello World!";
Console.WriteLine (c2);
//命名规范
//1.只能使用数字、字母、下划线、@组成,数字不能开头,@只能开头
int @a_1 = 10;
//2.不可以与系统保留字同名
//3.不能使用重复的变量名
int @A_1 = 10;
//规范
//4.见名知意
int age = 18;
//5.驼峰命名法
string myNameIs = "Lee";
//不要用
string 你好 = "Hello";
Console.WriteLine (你好);
int a1 = 1;
int a2 = 1;
int a3 = 1;
int a4 = 1;
int a5 = 1;
int a6 = 1;
int a7 = 1;
int a8 = 1;
int a9 = 1;
int b11 = 1;
int b22 = 1;
int b3 = 1;
int b4 = 1;
int b5 = 1;
int b6 = 1;
int b7 = 1;
int b8 = 1;
int b9 = 1;
bool c = true;
bool c21 = true;
bool c3 = true;
bool c4 = true;
bool c5 = true;
bool c6 = true;
bool c7 = true;
bool c8 = true;
bool c9 = true;
bool d1 = false;
bool d2 = false;
bool d3 = false;
bool d4 = false;
bool d5 = false;
bool d6 = false;
bool d7 = false;
bool d8 = false;
bool d9 = false;
char f = 'a';
char f12 = 'a';
char f22 = 'a';
char f3 = 'a';
char f4 = 'a';
char f5 = 'a';
char f6 = 'a';
char f7 = 'a';
char f8 = 'a';
char f9 = 'a';
char g1 = 'a';
char g2 = 'a';
char g3 = 'a';
char g4 = 'a';
char g5 = 'a';
char g6 = 'a';
char g7 = 'a';
char g8 = 'a';
char g9 = 'a';
string h1 = "kk";
string h2 = "kk";
string h3 = "kk";
string h4 = "kk";
string h5 = "kk";
string h6 = "kk";
string h7 = "kk";
string h8 = "kk";
string h9 = "kk";
string u1 = "kk";
string u2 = "kk";
string u3 = "kk";
string u4 = "kk";
string u5 = "kk";
string u6 = "kk";
string u7 = "kk";
string u8 = "kk";
string u9 = "kk";
float i1 = 2.5f;
float i2 = 2.2f;
float i3 = 2.5f;
float i4 = 2.8f;
float i5 = 2.8f;
float i6 = 2.9f;
float i7 = 2.8f;
float i8 = 2.8f;
float i9 = 2.9f;
float o1 = 2.8f;
float o2 = 2.8f;
float o3 = 2.8f;
float o4 = 2.8f;
float o5 = 2.8f;
float o6 = 2.7f;
float o7 = 2.7f;
float o8 = 2.8f;
float o9 = 2.7f;
double t1 = 2.44;
double t2 = 2.55;
double t3 = 2.8787;
double t4 = 2.578;
double t5 = 2152.55;
double t6 = 2.44;
double t7 = 2.77;
double t8 = 2.77;
double t9 = 2.7474;
double r1 = 2.55;
double r2 = 2.44;
double r3 = 2.447;
double r4 = 2.77;
double r5 = 2.44;
double r6 = 2.44;
double r7 = 2.44;
double r8 = 32.44;
double r9 = 2.44;
*/
// string str3 = "1";
// bool strBool = bool.Parse (str3);
// Console.WriteLine (strBool);
//
//
}
}