C Library - <string.h>

Library Variables

Following is the variable type defined in the header string.h −

Sr.No.	Variable & Description
1	size_t This is the unsigned integral type and is the result of the sizeof keyword.

Library Macros

Following is the macro defined in the header string.h −

Sr.No.	Macro & Description
1	NULL This macro is the value of a null pointer constant.

Library Functions

Following 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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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.