IF-THEN-ELSE-END IF

Action

Allows conditional execution or branching, based on the evaluation of a Boolean expression.

 

 

Syntax

IF expression THEN

 

[ ELSEIF expression THEN ]

 

[ ELSE ]

 

END IF

 

 

Remarks

Expression

Any expression that evaluates to true or false.

 

 

The one line version of IF can be used :

IF expression THEN statement [ ELSE statement ]

The use of [ELSE] is optional.

 

Tests like IF THEN can also be used with bits and bit indexes.

IF var.bit = 1 THEN

       ^--- bit is a variable or numeric constant in the range from 0-255

 

You can use OR or AND to test on multiple conditions. The conditions are evaluated from left to right.

IF A=1 OR A=2 OR A=3 OR B>10 THEN

IF A=1 AND A>3 THEN

 

 

 

Dim Var As Byte, Idx As Byte

Var = 255

Idx = 1

If Var.idx = 1 Then

 Print "Bit 1 is 1"

EndIf

 

 

See also

ELSE

 

 

Example

Dim A As Integer
A = 10
If A = 10 Then                                             'test expression
Print "This part is executed."                           'this will be printed
Else
Print "This will never be executed."                     'this not
End If
If A = 10 Then Print "New in BASCOM"
If A = 10 Then Goto Label1 Else print "A<>10"
Label1:
 
Rem The following example shows enhanced use of IF THEN
If A.15 = 1 Then                                           'test for bit
Print "BIT 15 IS SET"
EndIf
Rem the following example shows the 1 line use of IF THEN [ELSE]
If A.15 = 0 Then Print "BIT 15 is cleared" Else Print "BIT 15 is set"

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