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Character types of C language

2022-07-04 05:08:00 【Charming】

List of articles

Character type (char)

1. Basic introduction
2. Basic case
3. Character type usage details
4. On the nature of character type
5. ASCII Code introduction
6. ASCII Code comparison table

Character type (char)

1. Basic introduction

Character type can represent a single character , The character type is char,char yes 1 Bytes ( You can save letters or numbers ), Multiple characters are called strings , stay C In language Use char Array Express character string , Array is not a basic data type , It's the construction type

2. Basic case

%c Indicates that the output is in the form of characters

       
        void main() {
        
char c1 = 'A';
        
char c2 = '0';
        
char c3 = '\t';
        
printf("c1=%c c3=%c c2=%c", c1, c3, c2); //%c  Indicates that the output is in the form of characters 
        
getchar();
        
}
       
       
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C Character types of languages _C Character types of languages

3. Character type usage details

Character constants are in single quotes (' ') A single character enclosed . for example ：char c1 = 'a'; char c3 = '9';
C Escape characters are also allowed in ‘\’ To convert subsequent characters to special character type constants .
for example ：char c3 = ‘\n’; // '\n’ Means line break
stay C in ,char The essence of Integers , At output time , yes ASCII The character corresponding to the code .
You can give it directly to char Assign an integer , And then output , According to the corresponding ASCII Character output [97]
char Type is computable , It's a whole number , Because it all corresponds to Unicode code .
Case presentation ：

C Character types of languages _ASCII Code introduction _02

       
        #include<stdio.h>
        

        
void main(){
        
  char c1 = 'a';
        
  char c2 = 'b';
        
  // At this time, when we %c  When the output , Will install  ASCII  Encoding table ( understand   character  <==>  Numbers   Corresponding relation  )  Corresponding  97  Corresponding character output 
        
  char c3 = 97;
        
  printf("c1=%c c2=%c c3=%c", c1, c2, c3);
        
  getchar();
        
}
       
       
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C Character types of languages _c Language _03

4. On the nature of character type

Character Store in In the computer , The code value corresponding to the character needs to be （ Integers ） To find out
Storage ： character ’a’——> Code value (97)——> Binary system (1100001)——> Storage ()
Read ： Binary system (1100001)——> Code value (97)——> character ’a’——> Read ( Show )
The correspondence between character and code value is determined by character encoding table ( Yes, the rules are good )

5. ASCII Code introduction

Inside the computer , All data is represented in binary . Every binary bit （bit） Yes 0 and 1 Two kinds of state , therefore 8 A binary bit can be combined to form 256 States , This is called a byte （byte）. A byte can be used to represent 256 Different states , Each state corresponds to a symbol , Namely 256 Symbols , from 0000000 To 11111111.
ASCII code ： Last century 60 years , The United States has developed a set of character codes , The relationship between English characters and binary bits , Made a unified regulation . This is known as ASCII code .ASCII The code is specified 127 Character encoding , Such as the blank space “SPACE” yes 32（ Binary system 00100000）, Capital letters A yes 65（ Binary system 01000001）. this 128 Symbols （ Include 32 A control symbol that can't be printed ）, It only takes up the end of one byte 7 position , The front of 1 Bits are uniformly specified as 0.
Look at a complete ASCII clock