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The string.h header defines one variable type, one macro, and various functions for manipulating arrays of characters.
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. |
C Library string.h 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. |
C Library string.h 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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