List of statements and functions
================================

' built-in statements
END								terminates program execution
STOP							the same as above
SYSTEM							the same as above
RANDOMIZE n						sets n as a seed for random-number generator
CLS								clear screen
LOCATE x, y						moves cursor to row x, column y
COLOR fg, bg					sets foreground color to fg, background to bg;
								if bg is omitted, background is not changed
KILL file						deletes file
RENAME file1 TO file2			renames file1 to file2
CHDIR dir						change directory to dir
MKDIR dir						create directory dir
RMDIR dir						remove directory dir
SHELL cmd						execute MS-DOS command cmd

' string manipulation
ASC(char)						returns ASCII code of char
CHR(code)						returns character with given ASCII code
CHR$(code)						the same as above
LEN(string)						returns length of string
MID(string, start, count)		returns substring of string
MID$(string, start, count)		the same as above
LEFT(string, count)				returns count characters from the left
LEFT$(string, count)			the same as above
RIGHT(string, count)			returns count characters from the right
RIGHT$(string, count)			the same as above
TRIM(string)					removes all leading and trailing spaces
TRIM$(string)					the same as above
LTRIM(string)					remove all leading spaces
LTRIM$(string)					the same as above
RTRIM(string)					remove all trailing spaces
RTRIM$(string)					the same as above
UCASE(string)					converts string to uppercase
UCASE$(string)					the same as above
LCASE(string)					converts string to lowercase
LCASE$(string)					the same as above
INSTR(string, substr)			returns first occurence of substr in string
REPEAT(string, count)			returns string repeated count times
REPEAT$(string, count)			the same as above
STRING$(count, code)			returns characher with ASCII code repeated count times
SPACE(count)					returns count spaces
SPACE$(count)					the same as above

' math
IIF(condition, value1, value2)	if condition is true, returns value1, else returns value2
ABS(n)							absolute value of n
SIN(n)							sine of n
COS(n)							cosine of n
TAN(n)							tangence of n
POW(base, n)					base power n
SQR(n)							square root of n
CINT(n)							rounds n
FIX(n)							integer part of n
FRAC(n)							fractional part of n
RND								random fractional number in range 0..1
RND(n)							random integer in range 0..n
ROUND(n, d)						n rounded up to d-th sign (0 if omitted)
SGN(n)							returns 1 if n is positive, -1 if negative,	0 if zero
VAL(string)						converts string to number
STR(n)							converts n to string
STR$(n)							the same as above
HEX(n)							returns hexadecimal representation of n
HEX$(n)							the same as above
OCT(n)							returns octal representation of n
OCT$(n)							the same as above

' keyboard I/O
INSTAT							True if key is pressed, False if not
INKEY$							returns the key pressed; extended keys are returned
								as 2-character strings - first byte is CHR(0),
								the second is a key itself								
INKEY							returns two-byte code of key pressed; the save
								as above, but returns WORD rather then string

' misc
DIR$(pattern)					returns the first file matching the pattern or
								empty string if no such files
DIR$							returns the next file matching the pattern
								defined with first DIR$ call or empty string
								if no such files
DIR(pattern)					returns the BFileInfo structure representing the
								first file matching the pattern; structure has
								Name, Size and Attributes fields
DIR								returns the BFileInfo structure representing the
								next file matching the pattern defined with DIR
								
CURDIR							name of current directory
EXIST(file)						True if file exists, False if not
ENVIRON(var)					alue of environment variable var
DATE							current date
DATE$							the same as above
TIMER							number of seconds elapsed since Windows started;
								not since midnight!
LO(word)						low-order byte of word
LO(long)						low-order word of long
HI(word)						high-order byte of word
HI(long)						hight-order word of long


Stream-based I/O
================

Class: BStream
Base class:	none
Constructors:
	BStream
Properties:
	Position AS LONG			current position in stream, counting from beginning
	Size AS LONG				size of stream
Methods:
	Seek(offset, so) AS LONG	changes current position to offset relative to
								beginning of stream, current position or end of stream,
								depending on value so argument - valid values are
								soFromBeginning, soFromCurrent and soFromEnd
	EOF AS BOOLEAN				returns True if end of stream is reached
	ReadData(buf AS POINTER, len AS LONG)	reads len bytes from stream into buf
	Read(n)						reads data from stream and puts it into n;
								amount of data depends on type of n
	Read						reads INTEGER from stream and returns it
	Read%						reads SHORT from stream and returns it
	Read&						reads LONG from stream and returns it
	Read!						reads SINGLE from stream and returns it
	Read#						reads DOUBLE from stream and returns it
	Read$						reads STRING from stream and returns it
	ReadLine					reads a line of text from stream and returns it
	WriteData(buf AS POINTER, len AS LONG)	writes len bytes from buf into stream
	Write(n)					writes n to stream; amount of data written
								depends on type of n
	WriteLine(s)				writes s as a line of text to stream


Class: BFile
Base class: BStream
Constructors:
	BFile
	BFile(filename AS STRING, mode AS STRING)	opens file filename in given mode;
												mode can be fmOpenRead, fmOpenReadWrite,
												fmOpenCreateWrite, fmOpenCreateReadWrite
												(fmCreate); if mode is omitted, then
												fmOpenReadWrite is assumed
Methods:
	Open(filename AS STRING, mode AS STRING)	see constructor description
	Close										close the file


Functions available in console programs only
============================================
COMMAND(n)					returns command-line argument n; if n is 0, then
							name of executable is returned
COMMAND$(n)					the same as above
COMMANDS					return total number of command-line arguments