What are the common statements in the basics of VB language?

1. Assignment statement

Assignment of variable

Format:

［Let］ ＝

¨ Function: First calculate the value of the expression on the right side of the assignment number, and then assign the value to the variable.

Note:

"=" means "assignment" rather than "equal to", x = y and y = x are not equivalent.

The left side of "=" can only be variables, not values ​​or expressions. The following statement is wrong:

4 = x y

a b/2 = 6

Only one variable can be assigned a value at a time. If you want to assign the same value to multiple variables, you can only use multiple assignment statements.

For example: sum = 0: i = 0 cannot be written as: sum = i = 0

Dynamic setting of object attributes and return of object attribute values

Dynamics of object attributes Setting

Format: object name. Attribute name =

For example:

Command1.Caption = "Calculation"

Text2.Text=Str(c)

¨ Note: The Name attribute can only be assigned a value in the properties window

¨ Return of object attribute value

¨ For example:

R = Val (Text1.Text)

Related recommendations: "FAQ"

2.Print statement

［

Function: Output the value of each element in the on the specified object.

Example

Private Sub Command1_Click()

a = 123: b = 456: c = 789

Form1.Print a; b; c ' Output on the form Form1

Print "China", "World", a b c 'Output on the form Form1

Picture1.Print "China", "World", a b c 'Output on the form Form1 On the picture box Picture1

Debug.Print "China", "World", a b c 'Output on the immediate window

Printer.Print "China", "World", a b c 'On the printer Output

End Sub

Note:

Can only output content on the form, picture box, printer, and immediate window

Print related functions

①Tab() function

Tab(N)

Function: Move the cursor to the position determined by N.

②Spc() function

Spc(N)

Function: Move the cursor to the position after N spaces.

③Cls method

[

Function: Clear the information displayed by the Print method.

④Format$ function

Format$ (expression, format string)

Function: Generate a string from data such as numerical value, string or date according to the specified format

3. Comment statement

The way to add a comment statement in Vb is to add comment content after the character "'" (i.e. single quotation mark) or use the form of Rem comment content

Refer to the example in the print statement

4. End statement

Syntax format: end

Function: Force the program to end running

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