What are the common statements in the basics of VB language?
- 爱喝马黛茶的安东尼Original
- 2019-07-23 14:44:0416973browse
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
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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