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Several useful functions you will want to be aware of from the c library include:
size_t strlen (const char *s) calculates the size of null-terminated strings.
int strcmp (const char *sl, const char *s2) compares two strings alphabetically.
char * strdup (const char *s) takes the pointer to a string, and creates a new copy in a new location, and returns the new location.
FILE * fopen (const char *filename, const char *opentype) opens a managed, buffered file (allows easier reading and writing than using file descriptors directly).[3], [4]
int fclose (FILE * stream) closes a file opened with fopen.
char * fgets (char *s, int count, FILE *stream) fetches a line of characters into string s.
int fputs (const char *s, FILE *stream) writes a string to the given open file.
int fprintf (FILE *stream, const char *template, ...) is just like printf, but it uses an open file rather than defaulting to using standard output.
You can find the complete manual on this library by going to http://www.gnu.org/software/libc/manual/
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