<string.h>

The <string.h> include file declares the string manipulation functions:


`memchr` `memcmp` `memcpy` `memicmp`¹ `memmove` `memset`	`strcat` `strchr` `strcmp` `strcmpi`¹ `strcoll` `strcpy`	`strcspn` `strdup`¹ `strerror` `stricmp`¹ `strlen` `strncat`	`strncmp` `strncpy` `strnicmp`¹ `strnset`¹ `strpbrk` `strrchr`	`strset`¹ `strspn` `strstr` `strtok` `strtok_r` `strxfrm`
Note: ¹ These functions are available for C++ programs. They are available for C only when the program defines the __cplusplus__strings__ macro.

The <string.h> include file also defines the macro NULL, and the type size_t.

For more information about NULL and the type size_t, see <stddef.h>.