Summary of of on the Use of Character Class char in C Language

The char class represents one unicode character in C #, and it is these unicode characters that make up a string. unicode character is a general character code in computer at present. It sets a unified binary code for each character in different languages, which is used to meet the requirements of text conversion and processing across languages and platforms. The definition of char is very simple, as follows:

char ch1= 'z';

However, char can only define one unicode character.

The following are common usage methods and instructions of char class

iscontrol indicates whether the specified unicode character belongs to the control character category

isdigit indicates whether an unicode character belongs to the decimal digit category

ishighsurrogate indicates whether the specified char object is a high surrogate

isletter indicates whether an unicode character belongs to the letter category

isletterordigit indicates whether an unicode character belongs to the alphabetic or decimal digit category

islower indicates whether an unicode character belongs to the lowercase letter category

islowsurrogate indicates whether the specified char object is a low surrogate

isnumber indicates whether an unicode character belongs to the numeric category

ispunctuation indicates whether an unicode character belongs to the punctuation category

isseparator indicates whether an unicode character belongs to the delimiter category

issurrogate indicates whether an unicode character is a proxy character

issurrogatepair indicates whether two specified char objects form

issymbol indicates whether an unicode character belongs to the symbol category

isupper indicates whether an unicode character belongs to the capital letter category

iswhitespace indicates whether an unicode character belongs to the white space category

parse converts the value of a specified string to its unicode equivalent

tolower converts the value of an unicode string to its lowercase equivalent

tolowerinvariant converts the value of an unicode character to its lowercase equivalent using the case rules of a fixed culture

tostring converts the value of this instance to its equivalent string representation

toupper converts the value of an unicode character to its uppercase equivalent

toupperinvariant converts the value of an unicode character to its uppercase equivalent using the case rules of a fixed culture

tryparse converts the value of the specified string to its unicode equivalent

The following are common escape characters in C #

\ n Enter and Newline

\ f Page Change

\ t Skip sideways to the next 1 tabulation position

\\ Backslash

\ v Vertical Tab

\ 'Single quotation mark

\ b Backspace

\ ddd characters represented by 1 ~ 3 bits octal

\ r Enter

\ xhh characters represented by 1 ~ 2 digits 106-ary numbers