vb的复习（Review of VB）.docVIP

vb的复习（Review of VB） VB review.Txt love, say it out loud, because youll never know, tomorrow and accident, which will come first! The stone tells us that all the beloved ones are scattered at last, and all the others are reunited. You never see my loneliest time, because when I cant see you, I am most lonely! The third chapter is the basic grammar of Visual Basic 3.1 data type 1, basic data types 2, custom data types Used at the module level to define user-defined data types that contain one or more elements. Use form: Type custom type name Element name [[subscript]] As type name Element name [[subscript]] As type name .. End Type 3.2 variables Naming rules for variables 1) must begin with letters, followed by letters, numbers, or underscores 2) cannot have the same name as the keyword in VB 3) no more than 255 characters 4) can be expressed as the variable type character ($,%, # etc.) as the last character of the variable name. 5) case insensitive Declaration of variables A and Dim declare variables - Dim variable name [As data type note: default is variant type - Dim variable name, type, character suffix For example, the following two statements have the same effect Dim a As Integer Dim a% B and static declare variables Static variable name As data type Distinction: the variable value declared by static remains at the end of the process, and the initial value of the variable is the last reserved value the next time the procedure is invoked. The variable value declared by Dim does not remain after the end of the process and is re initialized at each call. 3.3 standard function VB provides hundreds of internal functions (library functions) that require the functionality and use of these commonly used functions. Calling method: The function name (parameter list) has a reference function Function name without argument function Explain： (1) use the library function to pay attention to the number of arguments and the data type of their arguments (2) pay attention to the