Computer Programming Concepts and Visual Basic David I. Schneider

the same as in the original Dimensioning of the array. ReDim may be used only within procedures;
it may not be used in the (Declarations) section of (General). To establish an array
that is available to all procedures and also can be resized, Dim it with empty parentheses in
the (Declarations) section of (General) and then ReDim it as needed within appropriate procedures.
REFRESH The method objectName.Refresh causes the named form or control to be
refreshed, that is, redrawn reflecting any changes made to its properties. Generally, refreshing
occurs automatically, but if not, it may be forced with the Refresh method.
REM The statement Rem allows documentation to be placed in a program. A line of the
form Rem comment is ignored during execution. The Rem statement may be abbreviated as
an apostrophe.
REMOVE A statement of the form collectionName.Remove n deletes the nth object from the
collection and automatically reduces the object numbers from n on by 1 so that there is no
gap in the numbers. A statement of the form collectionName.Remove keyString deletes the
object identified by the key keyString. If the value of n or keyString doesn’t match an existing
object of the collection, an error occurs.
REMOVEITEM The RemoveItem method deletes items from list and combo boxes and
deletes rows from grids. The statement List1.RemoveItem n (where n is 0, 1, . . .) deletes the
item with index n. For instance, List1.RemoveItem 0 deletes the top item and
List1.RemoveItem ListCount – 1 deletes the bottom item in the list. The statement MSFlex-
Grid1.RemoveItem n deletes row n from the grid.
RESET The statement Reset closes all open files. Using Reset is equivalent to using Close
with no file reference numbers.
RESUMEWhen the statement Resume is encountered at the end of an error-handling routine,
the program branches back to the statement in which the error was encountered. The variations
Resume lineLabel and Resume Next cause the program to branch to the first statement
following the indicated line label or to the statement following the statement in which the
error occurred, respectively. (The combination of On Error and Resume Next is similar to the
combination GoSub and Return.) [line label]
RETURN When the statement Return is encountered at the end of a subroutine, the program
branches back to the statement following the one containing the most recently executed
GoSub. The variation Return lineLabel causes the program to branch back to the first statement
following the indicated line label. [line label] [subroutine]
RGB The value of the function RGB(red, green, blue) is the color number corresponding to
a mixture of red red, green green, and blue blue. This color number is assigned to color properties
or used in graphics methods to produce text or graphics in a particular color. Each of
the three color components may have a value from 0 to 255. The color produced using
RGB(0, 0, 0) is black, RGB(255, 255, 255) is white, RGB(255, 0, 0) is bright red, RGB(10,
0, 0) is a dark red, and so on. (The value of the function RGB(r, g, b) is the long integer
r+256*g+65536*b.) [color]
RIGHT The value of the function Right(str, n) is the string consisting of the rightmost n
characters of str. If n is greater than the number of characters of str, then the value of the
function is str.
RMDIR If path specifies a directory containing no files or subdirectories, then the statement
RmDir path removes the directory. [directories]
RND The value of the function Rnd is a randomly selected number from 0 to 1, not including
1. The value of Int(n*Rnd)+1 is a random whole number from 1 to n.
ROUND The value of the function Round(n, r) is the number n rounded to r decimal places.
If r is omitted, n is rounded to a whole number.
Appendix C 447