The document describes various Visual Basic programming concepts including declaring variables, constants, conditional statements using IF/THEN/ELSE, and using GOTO statements. It defines variables like name and grade and assigns values. Conditional logic is demonstrated checking the grade variable against thresholds to set the Text1 variable value. GOTO statements are shown to transfer program flow to labeled lines.
8. •
Var1 = Value •
Var1 .1
Value .2
•
Dim name As String, grade As Single
name = “ ”
grade = 48.5
9. (IF)
(IF – THEN)
IF condition THEN statements
•
True •
•
IF grade >= 50 THEN Text1 = “ ”
10. (IF)
(IF – THEN – END IF)
IF condition THEN
……
Statements
......
END IF
•
•
IF grade >= 50 THEN
Text1 = “ ”
Text2 = “ ”
END IF
11. (IF)
(IF – THEN – ELSE)
IF condition THEN
……
Statements1
......
ELSE
……
Statements2
......
END IF
•
•
IF grade >= 50 THEN
Text1 = “ ”
ELSE
Text1 = “ ”
END IF
12. (IF)
(IF – THEN – ELSEIF)
IF condition THEN
……
Statements1
......
ELSEIF condition THEN
……
Statements2
......
ELSE
……
END IF
•
13. (IF)
(IF – THEN – ELSEIF)
•
IF grade >= 90 THEN
Text1 = “ ”
ELSEIF grade >= 80 THEN
Text1 = “ ”
ELSEIF grade >= 70 THEN
Text1 = “ ”
ELSEIF grade >= 60THEN
Text1 = “ ”
ELSE
Text1 = “ ”
END IF
•
ENDIF
14. GOTO
•
GOTO line
•
DIM name AS String, grade As Single
name = “ ”
GOTO AA
…..
…..
AA:
grade = 48.5
•
15. GOTO
•
IF condition THEN GOTO line
•
IF grade >=90 THEN GOTO A
IF grade <90 THEN GOTO B
A:
Text1 = “ ”
GOTO C
B:
Text1 = “ ”
GOTO C
C:
Print Text1
GOTO •
GOTO