Computer Programming Concepts and Visual Basic David I. Schneider

ISNUMERIC The value of the function IsNumeric(v) is True if v is a number, numeric variable,
or a variant variable that has been assigned a number or a string that could be obtained
by Formatting a number. In all other cases the value of IsNumeric is False. [variant]
ITEM The value of collectionName.Item(n) is the nth object in the named collection. The
value of collectionName.Item(keyString) is the nth object in the named collection, where
keyString is the key given to the object when it was added to the collection. If the value of n
or keyString doesn’t match an existing object of the collection, an error occurs.
ITEMDATA When you create a list or combo box, Visual Basic automatically creates a long
integer array referred to as ItemData. The statement List1. ItemData(m) = n assigns the value
n to the mth subscripted variable of the array. It is commonly used with the NewIndex property
to associate a number with each item in a list, and thereby create a minidatabase. The
ItemData property is especially useful for lists in which Sorted = True.
KEYPRESS The KeyPress event applies to command buttons, text boxes, and picture boxes.
A KeyPress event occurs whenever the user presses a key while one of the preceding controls
has the focus. A code identifying which key was pressed will be passed to the event procedure
in the KeyAscii parameter. This information can then be used to determine what
action should be taken when a given key is pressed.
KILL The statement Kill “filespec”deletes the specified disk file. [filespec]
LARGECHANGE When a scroll bar is clicked between the thumb and one of the arrow buttons,
the Value property of the scroll bar changes by the value of the LargeChange property
and the thumb moves accordingly.
LBOUND For a one-dimensional array arrayName, the value of the function LBound(array-
Name) is the smallest subscript value that may be used. For any array arrayName, the value
of the function LBound(arrayName, n) is the smallest subscript value that may be used for
the nth subscript of the array. For example, after the statement Dim example(1 To 31, 1 To
12, 1990 To 1999) is executed, the value of LBound(example, 3) is the smallest value allowed
for the third subscript of example( ), which is 1990.
LCASE The value of the string function LCase(str) is a string identical to str except that all
uppercase letters are changed to lowercase.
LEFT The property Left determines the position of the left edge of a form or control. The
units of measure are twips for forms. The units of measure for a control are determined by
the ScaleMode property of the container (form, picture box, etc.) upon which the control has
been placed, with the position of the control measured from the edge of its container using
the coordinate system established by the various Scale. . . properties for the container. By
default, the unit of measure for a container is twips, with a value of 0 for the Left property
placing the control against the left edge of the container.
LEFT The value of the function Left(str, n) is the string consisting of the leftmost n characters
of str. If n is greater than the number of characters in str, the value of the function is
str.
LEN The value of Len(str) is the number of characters in the string str. If var is not a variable-length
string variable, the value of Len(var) is the number of bytes needed to hold the
value of the variable in memory. That is, Len(var) is 1, 2, 2, 4, 4, 8, or 8 for byte, Boolean,
integer, long integer, single-precision, double-precision, and currency variables. Len(var),
when var is a variable with a user-defined record type, is the number of bytes of memory
needed to store the value of the variable. If var is a variant variable, Len(var) is the number
of bytes needed to store var as a string. [variant]
LET The statement Let var = expr assigns the value of the expression to the variable. If var
is a fixed-length string variable with length n and Len(expr) is greater than n, then just the
first n characters of expr are assigned to var. If Len(expr) < n, then expr is padded on the
Appendix C 439