1. const 修饰的常变量 例如//const int num=8;则输出num必为8，此时num常变量
2. #define defined identifier constant-#define MAX 10 then MAX is the constant 10
#define MAX 10
#include<stdio.h>
int main()
{
int arr[MAX] = { 0 };
printf("%d\n",MAX);
return 0;
}
3.枚举常量 ：enum
4. 字符串：由双引号引起的一串字符称为字符串。“”为空字符串
5.#include<stdio.h>#include<string.h>
int main()
{
printf("%d\n",strlen("chen"));
return 0;
}
6.
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ASCII code example:'a'——97,'A'——65. \0 represents the end of the string
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strllen is similar to sizeof, meaning string length, character size
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Learn to use \ to prevent symbols from becoming other meanings
