A string problem, which seems to be an escape character

Hello, I'm glad you questioned. Take a look below:

is an escape character that represents one (1).

The following 141 is the three lengths 1, 4, 1 (3) 141 for octal, (upstairs is not correct) 141 for the number 1 8 2 + 4 8 1 + 1 8 0 = 97 characters 'a'(1 pcs).

ABC Three lengths A, B, C (3).

t Skip horizontally to the next tab position (1).

There are 9 in total. Note: DDD and HH are ASCII** in octal and hexadecimal, respectively.

ddd is the character represented by a 1 3-digit octal number, and xhh is a character represented by a 1 2-digit hexadecimal number. For example, 101 means that the ASCII code is an octal 101 character, that is, a character'a'。Similarly, 102 denotes characters'b'。

1411 is not a number, it is two, which is divided into 141 and 1. I'll go into more detail about A1. Give it points. Thank you. ^_

This is an escape character that represents

141 is 3 characters.

141 is an escape character representing an octal number, and 141 represents a character that is'a'

ABC is 3 characters.

The t-level tabulation represents a character.

So there are 9 characters.

ddd (d stands for numbers 0-9), then it means the characters represented by 1 to 3 octal numbers.

xhh (h stands for numbers 0-9), then its meaning is the character represented by the 1 to 2 hexadecimal numbers.

1411 is a1 (because 141 stands for a).

ddd (three d for octal number symbols) represents the character represented by the octal number of 1-3 digits, and the 141 in this question 141 is converted to hexadecimal 61, which is a character'a';

xdd (x indicates that dd is a hexadecimal number) represents the characters represented by the hexadecimal number from 1 to 2.

As long as it is + a certain number, it will output the character corresponding to that number, for example, 141 represents the 141 character.

It's the character.

The following 141 identifies the octal character 'a'.

Summary. Hello dear. ' is an escape character.

All ASCII codes can be represented by " " plus a number (usually an occimal number). c defines some letters preceded by them"\"To represent common ASCII characters that cannot be displayed, such as 0, t, etc., are called escape characters, because the following characters are not its original ASCII character meaning.

'Whether it's an escape character.

Good. Hello dear. 'rotten' = is an escape character.

All ASCII codes can be represented by " " plus a number (usually an occimal number). c defines some letters preceded by them"\"To represent the common ASCII characters that cannot be displayed, such as 0, t, etc., are called escape characters, because the following characters are not the original ASCII character meaning.

Escape characters are part of the formal grammar of many programming languages, data formats, and communication protocols. For a given alphabet, the purpose of an escape character is to start a sequence of characters such that the sequence of characters that begins with the escape character has a different semantics than it would have had when the sequence appeared alone. Therefore, the sequence of characters that begin with an escape character is called an escape sequence.

Escape sequences generally have two functions. The first is to encode a syntactic late entity, such as a device command or special data that cannot be directly represented by the alphabet. The second function, also called character referencing, is used to represent characters that cannot be entered by the keyboard in the current context (such as carriage returns in strings), or that will have undesired meanings in the current context (such as double quotation marks in C language strings).", which cannot appear directly and must be represented by an escape sequence).

In the latter case, an escape sequence is a digraph case consisting of the escape character itself and a referenced character.

Hello, I'm glad you questioned. Take a look below:

is an escape character.

Represents one 1 piece).

The next 141 is three lengths.

3) stands for occimal.

Upstairs is not right) 141 represents the number in the base 8 system.

Character 'a'(1 pcs).

ABC in three lengths.

a, b, c3).

t Skip horizontally to the next tab.

1) 9 in total.

Note: DDD and HH are octal and hexadecimal, respectively.

ASCII**. \ddd

is the character represented by 1 3-digit octal number, xhh

is a 1 2-digit hexadecimal character. For example, 101 represents an ASCII code.

A character that is an octal 101 is a character'a'。Similar to this, 102 denotes the character of Hashieda'b'。

1411 is not a number, it is two, which is divided into 141 and 1. I'll go into more detail about A1. Give it points. Thank you. ^_

Think so.

The following escape characters make normal characters mean different things.

Escape characters. Description.

Apostrophe. Double girder lease quotation marks.

Backslashes. Empty characters. aRing. b

Back off. f. n

Wrap the line of spring repentance. r Enter. t

Horizontal slag scraping positive symbol.

v Vertical tabs.

xnnn stands for hexadecimal number (nnn).

Here's an example of using escape characters:

printf(

thisisatestshe

said,"how

areyou?\"n"

Output: thisisa

testshe

said,how

areyou?"

Escape characters in the C language are out of the box.

In the character set, there is a class of characters that has the property that when you type the character from the keyboard, the character can be displayed on the display, that is, whatever you type is displayed. These characters are called displayable characters, such as a, b, c, $, and spaces.

The other type of character does not have this characteristic. They either can't find a key on the keyboard that corresponds to the key (of course, they can be entered in a special way), or they can't display the characters on the key face when the key is pressed. In fact, this type of character is designed for the control effect, so it is called a control character.

In C, the control characters that make up character constants must be represented by escape characters. An escape character is a type of character that starts with " ". For example, the backspace character is used'\b'indication, line breaks are used''Denote.

escaped characters'\'Indicates that the character after it has lost its original meaning and has been transformed into another specific meaning. The backslash, along with the characters that follow it, form a specific character.

An escape character is a special form of representation of characters in the C language. Escape characters with backskew'\'It is followed by a character or an octal or hexadecimal number. Escape characters have a specific meaning, which is different from the original meaning of the character, so they are called escape characters.

Escape characters are commonly used to represent non-printable control characters and function-specific characters in the ASCII character set, such as the one-apostrophe (which is used to represent character constants') is used to represent a double apostrophe (") and backslashes ( ), etc.

For example, the following example is used in the format string of the printf function''It is an escape character, and its meaning is "carriage return line change". Escape characters are primarily used to represent controls that are not easily represented by generic characters.

Commonly used escape characters and their meanings.

ddd three-digit octal.

XHH two-digit hexadecimal.

Ascaii code range table.

The number 0---9 means: 48--57

Uppercase letters: 65---90

Lowercase letters indicate: 97---122

nul null character cr enter lf line break.

As you can see from the table, there are three types of escape characters in the C language, and they are: general escape characters, octal escape characters, and hexadecimal escape characters.

b, f、、、t, and v are all output device controllers. The backspace (b) takes the active position of the current line back one position. The page break (f) makes the active position jump to the beginning of the next page.

The carriage return (r) returns the active position to the beginning of the current line. The horizontal tab (t) moves the active position by several positions (usually 8). The vertical tab (v) makes the active position rotate a number of lines.

Note: v can be used to control the printer to wrap several lines, but it does not cause the PC's display to wrap.