Translation character '/b' in C ＃

C#  Translation characters in ’/b’

What are translation characters ?

Interpretation from Baidu Encyclopedia  —>  Escape character :

be-all ASCII Code can be used “\” Add numbers （ It's usually 8 Hexadecimal Numbers ） To express . and C Some letters are defined in and preceded by "" To show the common things that can't be shown ASCII character , Such as \0,\t,\n etc. , It's called an escape character , Because of the following characters , It's not the original ASCII The character means .

All escape characters and their corresponding meanings ：

Escape character significance ASCII Code value （ Decimal system ）

\a Ring the bell (BEL) 007

\b Backspace (BS) , Move the current position to the previous column 008

\f Change the page (FF), Move the current position to the beginning of the next page 012

\n Line break (LF) , Moves the current position to the beginning of the next line 010

\r enter (CR) , Move the current position to the beginning of the line 013

\t Horizontal TAB (HT) （ Skip to the next TAB Location ） 009

\v Vertical tabulation (VT) 011

\ Represents a backslash character ’’’ 092

’ Represents a single quotation mark （ apostrophe ） character 039

" Represents a double quote character 034

? Represents a question mark 063

\0 Null character (NUL) 000

\ddd 1 To 3 Any character represented by an octal number Three octal

\xhh Any character represented by hexadecimal Hexadecimal

Be careful ：

1.  distinguish , Slash ："/"  And   The backslash ："" , Not interchangeable here

2. \xhh  Hexadecimal escape does not limit the number of characters  ‘\x000000000000F’ == '\xF

Let's get to the point , look down C#  Translation characters in ’/b’:

Let's take a look at the code first

static void Main(string[] args)
{
 Console.WriteLine(" You chose it \b It's all about life ...");
 Console.WriteLine(" You chose it \b\b It's all about life ...");
 Console.WriteLine(" You chose it \b\b\b It's all about life ...");
 Console.WriteLine(" You chose it \b\b\b\b It's all about life ...");
}


Output ：

This output is different from what I imagined , The description is equivalent to backspace ? Why is there a space in the middle of the first sentence ? Why did the second sentence fall back only once ?

Judging from the output ’\b’, Is a space character , Replaced the previous character , But there are two explanations ’\b’ When together , the second ’\b’ The implementation of should be to replace the space character with the space character , Look back at the output of the second sentence , Obviously not , So what is this situation ? Please keep looking down :

static void Main(string[] args)
{
 Console.WriteLine(" I choose the '\b It's all about life ...");
 Console.WriteLine(" You chose it \'\b It's all about life ...");
 Console.WriteLine(" You chose it czy\b It's all about life ...");
 Console.WriteLine(" You chose it 123\b It's all about life ...");
 Console.WriteLine(" You chose it >>>\b It's all about life ...");
 Console.WriteLine(" You chose it 》》》\b It's all about life ...");
}


The use of ’\b’ character , modify ( String single quotes , Translated single quotation marks , Numbers , Letters, etc ), Look at the output , This is what we understand as backspace , So I think ’/b’ When you do the calculation , The preceding characters can be in ASCII The value found in the code table , Then it can play the role of backspace , If it cannot be found, its function can be understood as using the space character to replace the corresponding character .

I also found that when ’\b’ At the last character , It is not backspace , The code is as follows :

static void Main(string[] args)
{
 Console.WriteLine("123456\b");
 Console.WriteLine("123456\b\b");
 Console.WriteLine("123456\b\b\b");
 Console.WriteLine("123456\b\b\b\b");
 Console.WriteLine("-----------------------");

 Console.Write("123456\b"); 
 Console.WriteLine();
 Console.Write("123456\b\b");
 Console.WriteLine();
 Console.Write("123456\b\b\b");
 Console.WriteLine();
 Console.Write("123456\b\b\b\b");
 Console.WriteLine();
 Console.WriteLine("-----------------------");
 
 Console.Write("123456\b");
 Console.Write("123456");
}