2.c# input, output, and operator, data type

I. Definition of C # and its characteristics

C # is a new, simple, secure, object-oriented programming language that Microsoft released in July 2000 and is specifically designed for. NET, and the language developed by the application. It absorbs the advantages of C + +, Visual Basic, Delphi, Java and other languages, and embodies the features and essences of today's latest program design technology. NET Framework provides a powerful, easy-to-use, logical, and consistent program design technology environment for C #. At the same time, the common language (Common Language Runtime) provides a managed runtime environment for the C # programming language, making the program more stable and secure than ever before.

II. integrated development environment for Visual Studio.NET

. NET development language employs a unified, integrated development environment, Visual Studio.NET. described below.

(1) Visual Studio.NET start Page

After you start Visual Studio.NET, you first see a Start page as shown. On the Start page, you can open an existing project or create a new project.

(2) New visual1c#. NET Project

Click "File" → "new" → "Project" menu command in the upper left corner, the new Project dialog box will appear, in which you can choose a different programming language to create various projects that will share the Visual Studio.NET integrated development environment, as shown in.

Iii. output and input of C #

Create the console application. As shown in.

console. ReadKey(); //Input statement, do not wrap line

Console. ReadLine (); Input statement, wrap line

Console.Write (); Output statement, do not wrap line

Console.WriteLine (); Output statement, wrap line

string S=console. Readline (); where = equals assignment , string represents the character type, ands represents the container that holds the contents of the string specifically.

Note: All symbols must be entered in the English state, and the semicolon should not be omitted at the end.

Example: Please do a display name, year of birth, age, graduation school, work unit, contact information console, name, year of birth, age, graduation school, work unit, contact information must be entered at the front desk. As shown in the following:

Iv. notes

The content of the comment does not appear in the application.

Method One: Select the content you want to comment on, click "Comment Selected Rows" in the toolbar

Method Two: Select the content you want to comment, use the shortcut key Ctrl+k Ctrl + C; Uncomment: Use shortcut keys Ctrl+k ctrl+u

Method Three: Manual annotation. Note there is a line,/**/comments A section, such as:

V. Operators

Differences between pre + + and post + +:

int a=10,b=a++

A++====> can be written as int b=a int a=a+1

So a=11 b=10

int A=10,b=++a

++a====> can be written as int b=a+1 int a=a+1

So a=11 b=11

Vi. Types of data

Example: Please enter two numbers, then figure out two numbers, subtract, multiply, divide the result. Such as:

2.c# input, output, and operator, data type