"C-language summary" string

Storage of strings

The string is stored in a character array, and the last one must be
, the compiler considers this character array as a pointer to the char* type.

For example: printf("abc") //传递的时abc的地址，并且是a的地址
Operation:

char"abc";

char"abc"[1];

String variables

charstr[8"abcdefg";//会把这几个字符复制到这个字符数组中；

He is stored in the following ways:

If the string is not 7, the remaining units will be filled in.

If more than 7 will not consider this array as a string, the string must be followed by A;

charstr"abcdeg";//编译器会自动计算长度，str是首字符的地址char *str"abcdef";//str是一个指针指向abcdef首字符的地址，并且str一定要指向一个存在的字符串

Read and write String

printf("string is %s"str);//puts(str);scanf("%s"str);   //首先会跳过空白字符，然后读取，再次遇见空白字符停止读取gets(str);//遇见换行符才会停止

C Language String Library

The C language string library must contain # include

charstr[10];str"abc";//错误，不能使用=号运算符把字符串复制到字符数组中

String copy function strcpy function

char"hello world!";char str2[10];strcpy(str2, str1);

string concatenation function Strcat function

strcat(str1, "abc");//这里的str1要有足够控件容下abc

string comparison function strcmp function

strcmp(str1, str2);//相等返回0，str1>str2就返回大于0的数

function Strlen function for finding string length

intlen = strlen(str1);

Best way to store strings

The best way to store a string is a two-dimensional array;

charstring[][3] = {"hello""nihao"};char *string[] = {"hello","world","I","love","you"};

"C-language summary" string