C-Language Basics review: About character

1. Overview
2. Symbols and sizes of characters
3. Character (array) Declaration, definition, initialization, reference
3.1-character declaration-definition initialization reference
3.2-character array definition initialization reference

1. Overview

Character types play a big role in C programming, especially in Linux, where everything is documented, including character devices and block devices.
Mastering all the knowledge points of the character type, able to master the C programming under Linux.
This article mainly introduces the basic data types of C language-characters, as well as the knowledge points related to characters, including:

• Symbols and sizes of characters
• Declaration of a character (array), definition, initialization, reference
• Calculation of characters
• Character (two-dimensional) array
• String
• Character pointer

2. Symbols and sizes of characters

In different platforms, the size of the character data type is typically represented in a 1-byte memory area because the number of characters is not large, including 26 letters and some escape characters.
1-byte 8-bit, capable of storing 256 status values, also representing a capacity of 256 characters. If the first bit of the byte is the symbol, then the state value of the -127~+127 can be stored.
In C, the definition of a character in the header file/usr/include/stdint.h, including the definition of the character type definition and the character range
The C language sample code is as follows:

#include<stdio.h>#include<stdint.h>int main(){    printf("char size is :%d\n",sizeof(char));    printf("char max is:%d  min is:%d\n",INT8_MAX,INT8_MIN);    printf("unsigned char max is:%d\n",UINT8_MAx);    retuen 0;}

The result of the execution is:

char size is : 1char max is:127,min is:-128unsigned char max is:255

3. Character (array) Declaration, definition, initialization, reference 3.1-character declaration definition initialization reference

The C language sample code is as follows:

#include<stdio.h>int main(){    //编译器分配    char char_a = ‘A‘;    printf("%c\n",char_a);    //标准输入获取    printf("输入字符:\n");    scanf("%c",&char_a);    printf("输入的字符是:%c\n",char_a);    //其他输入方式，如磁盘文件，网络套接字，进程信号等    return 0;}

3.2-character array definition initialization reference

A character array, which is an array of character types.
The string is also an array of characters, but the string includes a transfer character at the end.
The code is as follows:

#include<stdio.h># define SIZE NUMint main(){    //字符数组定义和初始化同样遵循数组的定义和初始化    //定义    char a[];    错误    char a[SIZE];    正确    //定义和初始化    char a[] = {‘‘,‘‘}    正确    char a[SIZE] = {};    正确    return 0;}

C-Language Basics review: About character