I/O, file handling, directory control, and buffer manipulation functions in C programming with descriptions are listed below. You can use the following functions to work with values.

I/O Functions

Function	Use
Close	Closes a file.
fclose	Closes a file.
feof	Detects end-of-file.
fgetc	Reads a character from a file.
fgetchar	Reads a character from keyboard (function version).
fgets	Reads a string from a file.
fopen	Opens a file.
fprintf	Writes formatted data to a file.
fputc	Writes a character to a file.
fputchar	Writes a character to screen (function version).
fputs	Writes a string to a file.
fscanf	Reads formatted data from a file.
fseek	Repositions file pointer to given location.
ftell	Gets current file pointer position.
getc	Reads a character from a file (macro version).
getch	Reads a character from the keyboard.
getche	Reads a character from keyboard and echoes it.
getchar	Reads a character from keyboard (macro version).
gets	Reads a line from keyboard.
inport	Reads a two-byte word from the specified I/O port.
inportb	Reads one byte from the specified I/O port.
kbhit	Checks for a keystroke at the keyboard.
lseek	Repositions file pointer to a given location.
open	Opens a file.
outport	Writes a two-byte word to the specified I/O port.
outportb	Writes one byte to the specified I/O port.
printf	Writes formatted data to screen.
putc	Writes a character to a file (macro version).
putch	Writes a character to the screen.
putchar	Writes a character to screen (macro version).
puts	Writes a line to file.
read	Reads data from a file.
rewind	Repositions file pointer to beginning of a file.
scanf	Reads formatted data from keyboard.
sscanf	Reads formatted input from a string.
sprintf	Writes formatted output to a string.
tell	Gets current file pointer position.
write	Writes data to a file.

File Handling Functions

Function	Use
remove	Deletes file.
rename	Renames file.
unlink	Deletes file.

Directory Control Functions

Function	Use
chdir	Changes current working directory.
getcwd	Gets current working directory.
fnsplit	Splits a full path name into its components.
findfirst	Searches a disk directory.
findnext	Continues findfirst search.
mkdir	Makes a new directory.
rmdir	Removes a directory.

Buffer Manipulation Functions

Function	Use
memchr	Returns a pointer to the first occurrence, within a specified number of characters, of a given character in the buffer.
memcmp	Compares a specified number of characters from two buffers.
memcpy	Copies a specified number of characters from one buffer to another.
memicmp	Compares a specified number of characters from two buffers without regard to the case of the characters.
memmove	Copies a specified number of characters from one buffer to another.
memset	Uses a given character to initialize a specified number of bytes in the buffer.

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