#include 
enum Sex
{
    //枚舉類型Sex的三個可能取值 -枚舉常量
    MALE,   //0
    FEMALE, //1
    SECRET  //2
};
int main()
{
    enum Sex sex = FEMALE;
    //MALE = 2;             //err
    printf("%d\n", MALE);   //0
    printf("%d\n", FEMALE); //1
    printf("%d\n", SECRET); //2
    return 0;
}

#include 
//突出'\0'的重要性
int main()
{
    char arr1[] = "abcdef";
    char arr2[] = {'a', 'b', 'c','d','e','f'};
    char arr3[] = {'a', 'b', 'c','d','e','f','\0'};
	//%s 是打印字符串
    printf("%s\n", arr1);  //abcdef
    printf("%s\n", arr2);  //abcdef燙abcdef
    printf("%s\n", arr3);  //abcdef
    return 0;
}

#include 
#include 
//說明'\0'不算作字符串內(nèi)容
int main()
{
    char arr1[] = "abcdef";
    printf("%d\n", strlen(arr1));  //6
	//strlen - string length - 字符串長度 需要頭文件
    char arr2[] = {'b','i','t'} ;
    printf("%d\n", strlen(arr2));  //10  缺少\0輸出值是隨機值
    return 0;
}

#include 
int main()
{
    //問題1：在屏幕上打印一個單引號'，怎么做？
    //問題2：在屏幕上打印一個字符串，字符串的內(nèi)容是一個雙引號“，怎么做？
    //問題3：在屏幕上打印 c:\code\test.c\n，怎么做？
    printf("%c\n", '\'');         //'
    printf("%s\n", "\"");         //"
    printf("c:\\code\\test.c\n"); //c:\code\test.c\n
    return 0;
}

#include 
#include 
int main()
{
    printf("%d\n", strlen("abcdef"));
    // \62被解析成一個轉(zhuǎn)義字符
    printf("%d\n", strlen("c:\test\628\test.c")); //14
    return 0;
}