Usually Function

String:

• strlen (const char *s) [http://www.gnu.org/software/libc/manual/html_node/String-Length.html]
• sprintf (workName, "tTcpWork%d", ix++);
  

Byte Manipulate:

• bzero (buffer,256)

File:

• read (sFd, buffer, 255);
• write (sFd, buffer, strlen (buffer))
  

Process:

• fork()
  

Input/Ouput:

• scanf /*Read is a token as yhou want*/
  

     int  scanf ( const char * format, ... );

• gets(char *); /* Read the the stdin and is a string*/
  

• fgets /*Read from the file */
  

  char * fgets ( char * str, int num, FILE * stream );

Notice: gets will generate dangerous problem, so can using the fgets.

http://dsewnr.blogspot.com/2007/05/c-gets.html

http://www.cplusplus.com/reference/clibrary/cstdio/scanf/