Program

Void function * memmove (void * str1, const void * str2, size_t n) Copy n characters from str2 to str1, but to solve the matching of memory blocks, memmove () is a safe approach

The function 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 parameter str.

The char * strcat function (char * dest, const char * src) append the string pointed to by src, at the end of the string pointed to by dest.

Char * strncat (char * dest, const char * src, size_t n) append (string), pointed to by src, at the end of the string pointed to by dest, with a length of up to n characters.

Char * strchr function (const char * str, int c) looks for the first occurrence of the character c (an unsigned char) in the string pointed to by parameter str.

The function int strcmp (const char * str1, const char * str2) compares the string pointed to by sr1 with the string pointed to by srt2.

The function int strncmp (const char * str1, const char * str2, size_t n) compares the first n bytes of str1 and str2.

The function int strcoll (const char * str1, const char * str2) compares strings str1 and str2. The result depends on setting LC_COLLATE.

Char * strcpy function (char * dest, const char * src) copies the string pointed to by src to dest.

Strncpy char * (char * dest, const char * src, size_t n) copies up to n copies to n characters from the string pointed to by src to dest. In case the length of the src is smaller

The function size_t strcspn (const char * str1, const char * str2) calculates the length of the character segment of string str1 without containing the characters in str2.

The function char * strerror (int errnum) searches for an internal array for errnum error numbers and returns a pointer to a string of error messages.

The function size_t strlen (const char * str) calculates the length of str string (not including the ending null character).

Char * strpbrk (const char * str1, const char * str2) finds the first character in str1 string that connects any character specified in str2. (not including null ending

Char * strrchr (const char * str, int c) looks for the last occurrence of the character c (an unsigned char) in the string pointed to by parameter str.

Function size_t strspn (const char * str1, const char * str2) calculates the length of the first character segment of the str1 string containing the characters in str2

Char * strtok function (char * str, const char * delim) divides the string str into a sequence of tokens separately separated by delim separators (eg comma, ...).

The function size_t strxfrm (char * dest, const char * src, size_t n) transforms the first n characters of the src string into the current locale and places them in dest string.

The printf () function in the Standard C library sends formatted output to a stdout.

The file header named time.h in Standard Library C defines four variable types, two macros and various functions for date and time operations.