The strcoll () function in C
the function int strcoll (const char * str1, const char * str2) compares strings str1 and str2. the result depends on setting lc_collate.
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Strcpy () function in C
char * strcpy function (char * dest, const char * src) copies the string pointed to by src to dest.
The function strpbrk () in C
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
The strrchr () function in C
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.
The strspn () function in C
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
The strtok () function in C
char * strtok function (char * str, const char * delim) divides the string str into a sequence of tokens separately separated by delim separators (eg comma, ...).
Function strxfrm () in C
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.
time.h in C
the file header named time.h in standard library c defines four variable types, two macros and various functions for date and time operations.
The function memcpy () in C
function void * memcpy (void * str1, const void * str2, size_t n) copies n characters from str2 to str1.
The strstr () function in C
char * function strstr (const char * haystack, const char * needle) looks for the final occurrence of the whole needle string (not including the ending null character) that is