{{DISPLAYTITLE:_READBIT}}
The [[_READBIT]] function is used to check the state of a specified bit of a integer value.


{{PageSyntax}}
:{{Parameter|result}} = [[_READBIT]]({{Parameter|numericalVariable}}, {{Parameter|numericalValue}})


{{Parameters}}
* {{Parameter|numericalVariable}} is the variable to read the state of a bit of and can be of the following types: [[_BYTE]], [[INTEGER]], [[LONG]], or [[_INTEGER64]].
* Integer values can be signed or [[_UNSIGNED]].
* {{Parameter|numericalValue}} the number of the bit to be read.


{{PageDescription}}
* Used to check the current state of a bit in an integer value.
* Returns -1 if the bit is set(1), otherwise returns 0 if the bit is not set(0)
* Bits start at 0 (so a [[_BYTE]] has bits 0 to 7, [[INTEGER]] 0 to 15, and so on)

==Availability==
* '''Version 1.4 and up'''.


{{PageExamples}}
''Example 1:''
{{CodeStart}}
A~%% = {{Cl|_SETBIT}}(A~%%,4)
{{Cl|PRINT}} "Bit 4 is currently ";
IF {{Cl|_READBIT}}(A~%%,4) = -1 THEN {{Cl|PRINT}} "ON" ELSE {{Cl|PRINT}} "OFF"
{{Cl|PRINT}} "And bit 2 is currently ";
IF {{Cl|_READBIT}}(A~%%,2) = -1 THEN {{Cl|PRINT}} "ON" ELSE {{Cl|PRINT}} "OFF"
{{CodeEnd}}
{{OutputStart}}
Bit 4 is currently ON
And bit 2 is currently OFF
{{OutputEnd}}

''Example 2:''
{{CodeStart}}
B& = 12589575
{{Cl|PRINT}} "B& ="; B&
FOR I%% = 31 TO 0 STEP -1 '32 bits for a {{Cl|LONG}} value
 Binary$ = Binary$ + {{Cl|LTRIM$}}({{Cl|STR$}}({{Cl|ABS}}({{Cl|_READBIT}}(B&, I%%))))
NEXT I%%
{{Cl|PRINT}} "B& in binary is: "; Binary${{CodeEnd}}
{{OutputStart}}
B& = 12589575
B& in binary is: 00000000110000000001101000000111
{{OutputEnd}}


{{PageSeeAlso}}
* [[_SHL]], [[_SHR]], [[INTEGER]], [[LONG]]
* [[_SETBIT]], [[_BYTE]], [[_INTEGER64]]
* [[_RESETBIT]], [[_TOGGLEBIT]]

{{PageNavigation}}
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