Computer Programming Concepts and Visual Basic David I. Schneider

426 Computer Programming Concepts and Visual Basic
computer also draws its radius line. The ratio of the length of the vertical diameter to the
length of the horizontal diameter will be a. After the Circle method is executed, the value of
objectName.CurrentX becomes x and the value of objectName.CurrentY becomes y. [color]
[coordinate systems] [radians]
CLEAR The method ClipBoard.Clear clears the clipboard, setting its contents to the null
string. The statements List1.Clear and Combo1.Clear remove all items from the control’s list.
CLICK The Click event applies to check boxes, combo boxes, command buttons, directory
list boxes, file list boxes, forms, frames, grids, images, labels, list boxes, menu items, OLE
controls, option buttons, picture boxes, and text boxes. A Click event occurs whenever the
left mouse button is pressed and released while the mouse cursor is over the control or over
a blank area on the form. In the case of a command button, the Click event is also called if
the spacebar or Enter key is pressed while the command button has the focus, or if the button’s
access key is used.
CLNG The function CLng converts byte, integer, single-precision, double-precision, and
currency numbers to long integer numbers. If x is any number from –2,147,483,648 to
2,147,483,647, the value of CLng(x) is the (possibly rounded) long integer constant that x
determines.
CLOSE The statement Close #n closes the file that has been opened with reference number
n. By itself, Close closes all open files. The Close method for a data control closes the database.
CLS The method formName.Cls clears the form formName of all text and graphics that have
been placed directly on the form with methods like formName.Print, formName.Circle, and
so on. The method pictureBox.Cls clears the named picture box. The Cls method resets the
CurrentX and CurrentY properties of the cleared object to the coordinates of the upper-left
corner [usually (0, 0)].
COL and ROW The Col and Row properties specify the current cell of a grid. The statements
MSFlexGrid1.Col = m and MSFlexGrid1.Row = n specify the cell in column m and
row n to be the current cell. The statement MSFlexGrid1.Text = str places the string into the
current cell. When the user clicks on a nonfixed cell, its column number is assigned to the
Col property and its row number is assigned to the Row property.
COLALIGNMENT The statement MSFlexGrid1.ColAlignment(m) = n, aligns the text in
column m both vertically and horizontally according to the following table.
n Horizontally Vertically
0 Left Top
1 Left Centered
2 Left Bottom
3 Centered Top
4 Centered Centered
5 Centered Bottom
6 Right Top
7 Right Centered
8 Right Bottom
9 Strings left-justified
Numbers right-justified
COLOR The value of the Color property of a Color common dialog box identifies the selected
color.