1.2c# variables and operators and annotations

1.2.1c# Data types

Common data types in C # have integer int, float float, string, boolean bool,

Analogous to int in Java, float, String, Boolean

1.2.2c# variable Name

In C #, variables are declared in the same way as Java, using the following method: Access modifier data type variable name,

The variable naming convention in C # is basically the same as Java, except that the $ symbol cannot be used in C #, as follows:

1. Composition: 52 English Letters (A~Z,A~Z), 10 digits (0~9), underscore (_), other characters not included

2. Start: Only with letters or underscores

3. Cannot be used: cannot be a keyword in C #

operator in 1.2.3c#

C # provides all the common operators supported by Java, using the same way, commonly used as follows,

Arithmetic operators: +,-, * (multiply),/(except),% (remainder), + +,--

Comparison operator: >,<,>=,<=,==,!=

Conditional operator:?:

Assignment operator: =,+=,-=,*=,/=,%=

Logical operator:&& (and), | | (OR),! Non-

Note: It is important to write a comment for it when writing the code, where a variety of annotation types are available in C #, where the line comments are used//, the block annotations use the/**/(as in Java), the document comments are used with///, and the document comments start with a///line (slightly different from Java)

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Linq;4 usingSystem.Text;5 usingSystem.Threading.Tasks;6 7 namespaceHellowworld8 {9    /// <summary>Ten    ///This program implements the output of a message to the console One    /// </summary> A    /// <param name= "args" ></param> -    class Program -    { the       //entrance to the program -       Static voidMain (string[] args) -       { -          /*start writing code from here*/ +Console.WriteLine ("Hellow World");//output A Word to the console -Console.ReadLine ();//Pause the output display +       } A    } at}

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1.2c# variables and operators and annotations