1.1.3 understand c # program,

1.1.3 understand c # program,

Using System;

Using System. Collections. Generic;

Using System. Linq;

Using System. Text;

Using System. Threading. Tasks;

Namespace HellowWorld

{

Class Program

{

Staticvoid Main (string [] args)

{

Console. WriteLine ("hellow world ");

Console. ReadLine ();

}

}

}

1. namespace keywords

Namespace is a way to organize code in c #. Similar to the package in java, you can put closely related code in the same namespace, greatly improve management and use efficiency

2. using Keyword

Use using in c # To reference other namespaces, similar to using import to import other packages in java

3. class keywords

C # is an object-oriented language like java. class keywords are used to represent classes. The written code should be included in the class, and the class should be included in the namespace. c # is different from java, the class name is not required to be the same as the class file name

4. Main Method

The Main () method in c # is the main gate of the program. The application starts to run from here, which works the same as Main () in java, but Main () in c () the initial letter must be larger.

The Main () return values of c # include void or other values, and the parameters can be optional. There are four forms.

Static void Main (){}

Static int Mian (){}

Sttic void Main (string [] args ){}

Static int Main (string [] args ){}