Learn Visual Basic 6.0

2. The Visual Basic Language

Visual Basic Branching - If Statements

1. Branching statements are used to cause certain actions within a program if a certain condition is met.
   
   
2. The simplest is the If/Then statement:
   
   If Balance - Check < 0 Then Print "You are overdrawn"
   
   Here, if and only if Balance - Check is less than zero, the statement "You are overdrawn" is printed.
   
   
3. You can also have If/Then/End If blocks to allow multiple statements:
   
   If Balance - Check < 0 Then
   Print "You are overdrawn"
   Print "Authorities have been notified"
   End If
   
   In this case, if Balance - Check is less than zero, two lines of information are printed.
   
   
4. Or, If/Then/Else/End If blocks:
   
   If Balance - Check < 0 Then
   Print "You are overdrawn"
   Print "Authorities have been notified"
   Else
   Balance = Balance - Check
   End If
   
   Here, the same two lines are printed if you are overdrawn (Balance - Check < 0), but, if you are not overdrawn (Else), your new Balance is computed.
   
   
5. Or, we can add the ElseIf statement:
   
   If Balance - Check < 0 Then
   Print "You are overdrawn"
   Print "Authorities have been notified"
   ElseIf Balance - Check = 0 Then
   Print "Whew! You barely made it"
   Balance = 0
   Else
   Balance = Balance - Check
   End If
   
   Now, one more condition is added. If your Balance equals the Check amount (ElseIf Balance - Check = 0), a different message appears.
   
   
6. In using branching statements, make sure you consider all viable possibilities in the If/Else/End If structure. Also, be aware that each If and ElseIf in a block is tested sequentially. The first time an If test is met, the code associated with that condition is executed and the If block is exited. If a later condition is also True, it will never be considered.

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