Computer Programming Concepts and Visual Basic David I. Schneider

Unlock statement is used to remove locks from files. All locks should be removed before a
file is closed or the program is terminated. [binary file]
LOF After a file has been opened with reference number n, the number of characters in the
file (that is, the length of the file) is given by LOF(n). For communications, the value of
LOF(n) equals the number of bytes waiting in the communications buffer with reference
number n.
LOG If x is a positive number, the value of Log(x) is the natural logarithm (base e) of x.
LONG A variable of type Long requires 4 bytes of memory and can hold the whole numbers
from –2,147,483,648 to 2,147,483,647. Long values and variables may be indicated by
the type tag &: 12345678&, Population&.
LOSTFOCUS A LostFocus event occurs when an object loses the focus, either through a
user action or through code, via the SetFocus method.
LSET If strVar is a string variable, then the statement LSet strVar = str replaces the value of
strVar with a string of the same length consisting of str truncated or padded on the right with
spaces. LSet also can be used to assign a record of one user-defined type to a record of a different
user-defined type.
LTRIM The value of the function LTrim(str) is the string obtained by removing all the
spaces from the beginning of the string str. The string str may be either of fixed or variable
length.
MAX and MIN The Max and Min properties of scroll bars give the values of horizontal (vertical)
scroll bars when the thumb is at the right (bottom) and left (top) arrows, respectively.
MAXBUTTON The MaxButton property determines whether or not a form has a Maximize
button in the upper-right corner. If the value of the MaxButton property is set to True (the
default), a Maximize button is displayed when the program is run. The user then has the
option to click on the Maximize button to cause the form to enlarge and fill the entire screen.
If the value of the MaxButton property is set to False, the maximize button is not displayed
when the program is run, and the user is thus unable to “maximize” the form.
MAXLENGTH The property MaxLength determines the maximum number of characters
that a text box will accept. If the MaxLength property for a text box is set to 0 (the default),
an unlimited number of characters may be entered in the text box.
MID The value of the function Mid(str, m, n) is the substring of str beginning with the mth
character of str and containing up to n characters. If the parameter n is omitted, Mid(str, m)
is all the characters of str from the mth character on. The statement Mid(str, m, n) = str2
replaces the characters of str, beginning with the mth character, by the first n characters of
the string str2.
MINBUTTON The MinButton property determines whether or not a form has a Minimize
button in the upper-right corner. If the value of the MinButton property is set to True (the
default), a Minimize button is displayed when the program is run. The user then has the
option to click on the Minimize button to cause the form to be replaced by a small icon in
the Taskbar at the bottom of the screen. If the value of the MinButton property is set to False,
the Minimize button is not displayed when the program is run, and the user is thus unable to
“minimize”the form.
MINUTE The function Minute extracts the minutes from a serial date. If d is any valid serial
date, the value of Minute(d) is a whole number from 0 to 59 giving the minutes recorded
as part of the date and time stored in d. [date]
MKDIR The statement MkDir path\dirName creates a subdirectory named dirName~ in the
directory specified by path. [directories]
Appendix C 441