The string.h header defines one variable type, one macro, and various functions for manipulating arrays of characters.
Library VariablesFollowing is the variable type defined in the header string.h −
Sr.No. Variable & Description 1size_t
This is the unsigned integral type and is the result of the sizeof keyword.
C Library string.h MacrosFollowing is the macro defined in the header string.h −
Sr.No. Macro & Description 1NULL
This macro is the value of a null pointer constant.
C Library string.h FunctionsFollowing are the functions defined in the header string.h −
Sr.No. Function & Description 1 void *memchr(const void *str, int c, size_t n)Searches for the first occurrence of the character c (an unsigned char) in the first n bytes of the string pointed to, by the argument str.
2 int memcmp(const void *str1, const void *str2, size_t n)Compares the first n bytes of str1 and str2.
3 void *memcpy(void *dest, const void *src, size_t n)Copies n characters from src to dest.
4 void *memmove(void *dest, const void *src, size_t n)Another function to copy n characters from str2 to str1.
5 void *memset(void *str, int c, size_t n)Copies the character c (an unsigned char) to the first n characters of the string pointed to, by the argument str.
6 char *strcat(char *dest, const char *src)Appends the string pointed to, by src to the end of the string pointed to by dest.
7 char *strncat(char *dest, const char *src, size_t n)Appends the string pointed to, by src to the end of the string pointed to, by dest up to n characters long.
8 char *strchr(const char *str, int c)Searches for the first occurrence of the character c (an unsigned char) in the string pointed to, by the argument str.
9 int strcmp(const char *str1, const char *str2)Compares the string pointed to, by str1 to the string pointed to by str2.
10 int strncmp(const char *str1, const char *str2, size_t n)Compares at most the first n bytes of str1 and str2.
11 int strcoll(const char *str1, const char *str2)Compares string str1 to str2. The result is dependent on the LC_COLLATE setting of the location.
12 char *strcpy(char *dest, const char *src)Copies the string pointed to, by src to dest.
13 char *strncpy(char *dest, const char *src, size_t n)Copies up to n characters from the string pointed to, by src to dest.
14 size_t strcspn(const char *str1, const char *str2)Calculates the length of the initial segment of str1 which consists entirely of characters not in str2.
15 char *strerror(int errnum)Searches an internal array for the error number errnum and returns a pointer to an error message string.
16 size_t strlen(const char *str)Computes the length of the string str up to but not including the terminating null character.
17 char *strpbrk(const char *str1, const char *str2)Finds the first character in the string str1 that matches any character specified in str2.
18 char *strrchr(const char *str, int c)Searches for the last occurrence of the character c (an unsigned char) in the string pointed to by the argument str.
19 size_t strspn(const char *str1, const char *str2)Calculates the length of the initial segment of str1 which consists entirely of characters in str2.
20 char *strstr(const char *haystack, const char *needle)Finds the first occurrence of the entire string needle (not including the terminating null character) which appears in the string haystack.
21 char *strtok(char *str, const char *delim)Breaks string str into a series of tokens separated by delim.
22 size_t strxfrm(char *dest, const char *src, size_t n)Transforms the first n characters of the string src into current locale and places them in the string dest.
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