【C#零基础入门教程 Visual Studio 2022】人生低谷来学C#

一变量 赋值

var a = 100;

var b = 200;

var sum = 0;

sum = a + b ;

console. writeline(sum);

console.readline();

字符类型

char 单个字符

string 字符串

bool 正负

double decimal int 数字

\n 切行

重新赋值

int a = 20;

int b = 30;

int temp = 0; 定义temp

temp = n1;

n1 = n2;

转换类型

console.writeline('plz enter a num");

string str = console. readline();

string num = str + 20.tostring();

console.writeline(num);

console.readlien();

二输入

1信息收集

console.writeline("plz enter your name");

string name = console.readline();

name为string格式

console.writeline('plz enter your habit");

string habit = console.readlne();

//组织格式

string info = "your name is:";

string newinfo = info + name;

console.writeline(newinfo); 复杂

coonsole.writeline("your name is;" + name);简便

三if条件

bool变量只存在 true or false；

bool tag = true;

if (tge);

{

console.writeline(" there is inner of if");

console.writeline("ya only see me when bol is true");

}

console.readline();

等于if

bool checked = name == "mike"; //两个等于是如果等于

      Console.WriteLine("plz enter ya name");

      string name = Console.ReadLine();

      

      bool ischeck = name == "Mike";

      if (ischeck)

      {

        Console.WriteLine("your entered Mike");

        name = "bandit mike";

      }

      Console.WriteLine("your name is" + name);

      Console.ReadLine();

不等于if