C # design basics

C # design basics

(i) C # project composition structure

1. Project structure

. config---configuration file (storage configuration parameter file)

. csproj---Project files (manage file entries)

. SLN---Solution files (Manage projects)

. cs---Source file (program code)

1. Four elements of a function

Name, input, output, processing

1. Contents of the main function

Console.readkey (); Input statement

console.readline ();// Input Statement

Console.WriteLine ();// Output Statement

Console.WriteLine ();//Output statement

Namespace ConsoleApplication1 Namespace

Class Program

static void Main (string[] arges) method

1. Precautions

Comments

Note: Tell the computer not to do it as a code.

1.//comment To line end, comment one line.

2./*SDFASDFASDF **/comments in the middle of the content, multiple lines.

(ii) Data types

1. Common Key data types

Shaping: Integer type

Short Int16 2 bytes (16 digits)

Int Int32 4-byte (32-digit) value space is an integer maximum absolute value smaller than the mobile number one

Long Int64 8 bytes (64 digits)

Float Type: decimal type

Float single 4-byte assignment plus suffix F or f differs from double assignment

Double Double 8 bytes

Decimal decimal 16 byte Assignment range decimal part large so the range of assignments is not necessarily larger than the double range

Character type

Char Char 2 bytes Only one character can be placed, and only single quotation marks can be used

Boolean type Switch

BOOL Boomleam 1 bytes can only put ture or false, cannot be quoted

String Type Multiple Letter Strings

String String character Sequences to use double quotation marks

2 Escape Symbols

\ " Double quotes represents a double-quote character

\ \ counter Slash represents a backslash character "' \ '

\ r Enter (CR) To move the current position to the beginning of the bank

\ n line Break (LF) , move the current position to the beginning of the next line

\ t Horizontal Tabulation (HT) (Skip to next TAB location)

(iii) Basic type conversion

Automatic conversion: Automatic conversion If there is no data loss

Cast:

Add parentheses to the number on the left side of the converted value, and write in parentheses to be converted to that type float a= (float) 3.14

For strings:

Method One

int A=int. Parse ("string"); float b=float. Parse ("string"); double c=double. Parse ("string")

Method Two

int A=convert.  ToInt32 (a); Float B=convert. ToSingle (b);

Practice Case One

static void mainstring[] args)

{

Console.WriteLine ("Little hi: What's your name?") ");

Console.Write ("I:");

String xm = Console.ReadLine ();

Console.WriteLine ("Small hi: Oh, so you are the" +xm+ "Ah, too! , what do you like to eat? ");

Console.Write ("I:");

string sw = Console.ReadLine ();

Console.WriteLine ("Small hi: I also like to eat" +sw+ ", you can eat how much ah?) ");

Console.Write ("I:");

String sl = Console.ReadLine ();

Console.WriteLine ("Small hi: you actually eat" +sl+ ", than I eat a lot of");

Practice Case II

Console.WriteLine ("Please enter a number:");

String a = Console.ReadLine ();

Console.WriteLine ("Please enter another number:");

String B = Console.ReadLine ();

Console.WriteLine (Convert.ToInt32 (a) +convert.toint32 (b));

Console.WriteLine (int. Parse (a) + int. Parse (b));

C # design basics