Visual Basic Project 2 IDS 306 Spring 1999 V. Murphy

List boxes and Combo boxes see table 2-1 page 2.13 for types Type set with Style property List property AddItem method ListIndex

Text Boxes Locked property –when true user cannot change its contents MultiLine property ScrollBars property –horizontal or vertical Note: there is no caption property for a text box

Frames and other controls Frame Option Button –why use a non-visible button Shapes –borders –visual enhancements Check boxes

Variables Data type--determines kind of data variable can store Naming rules –must begin with a letter –cannot be more than 255 characters –cannot contain punctuation or blank spaces

Declaring Variables Implicitly declared--created by using them –rate = 3.5 Explicitly declared--in a separate code statement –Dim variablename As datatype scope static

Arithmetic Operators see table 2-7 page 2.45

Comparison Operators see table 2-8 page 2.46

Predefined Formats General Number--displays as is Currency--dollar sign, thousand separator, 2 digits to right, negatives in parentheses Fixed--2 digits to right, at least 1 to left Standard--thousands separator, (2 to right) Percent--multiplied by 100, % Yes/No--No if number is 0, else Yes

Strings Format$ statement –$ instructs VB to change numeric result to a string strings –character data –placed within quotation marks null string--““ concatenation--adding strings together

Control Code Characters chr$(13)--return insertion point to beginning of line chr$(10)--move insertion point down one line constants –vbNewLine = chr$(10) & chr$(13) –False = 0 –True = -1

VB Naming Conventions See Table 2-2 page 2.28