Conditional Operators

[Flood]

In Visual Basic, we are using Conditional Operators to evaluate a condition that applied to one or two boolean expressions. An expression returning a value if the that expression is true and a different one if the expression is evaluated as false. The logical AND and OR operators both take two operands. Each operand is a boolean expression. It evaluates to either true or false.

The && (logical AND) operator indicates whether both operands are true then it returns true, otherwise it returns false.

Evaluating of Logical AND operators through expressions.

Expression Results
1 && 1 True or 1
1 && 0 False or 0
0 && 1 False or 0
0 && 0 False or 0

Visual Basic Code:

1. 'declare a variable
   
2. Dim
   
   username As
   
   String
   
3. Dim
   
   password As
   
   String
   
4. 'assign value to a variable
   
5. username =
   
   "joken"
   
6. password =
   
   "12345"
   
7. 
   
8. 'test if the two expression match, then it welcome the user
   
9. If
   
   username =
   
   "joken"
   
   And
   
   password =
   
   "12345"
   
   Then
   
10. 'returns true
    
11. MsgBox
    
    (
    
    "Welcome joken!"
    
    )
    
12. 
    
13. Else
    
14. 'return false
    
15. MsgBox
    
    (
    
    "Username and Password did not match!"
    
    )
    
16. End
    
    If
    

The || (logical OR) operator indicates whether either operand is true, it returns true.

Evaluating of Logical OR operators through expressions.

Expression Results
1 && 1 True or 1
1 && 0 True or 1
0 && 1 True or 1
0 && 0 False or 0

Visual Basic Code:

1. 'declare a string variable
   
2. Dim
   
   name As
   
   String
   
3. 'assign value to a string variable
   
4. name =
   
   "Joken"
   
5. 'test if name either of the two expression is true
   
6. If
   
   name =
   
   "Joken"
   
   Or
   
   name =
   
   "joken"
   
   Then
   
7. 'return true
   
8. MsgBox
   
   (
   
   "Welcom Joken!"
   
   )
   
9. Else
   
10. 'return false
    
11. MsgBox
    
    (
    
    "Your not identified!"
    
    )
    
12. End
    
    If
    

In above example example is applicable in real-world application, especially when you are doing the login- logout system or any other application that need to passed through conditional operations.

Book traversal links for Conditional Operators

• ‹ ComboBox Control
  
• Up
  
• Constants ›