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49 lines
1.2 KiB
Plaintext
49 lines
1.2 KiB
Plaintext
The [[OR]] numerical operator returns a comparative bit value of 1 if either value's bit is on.
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{{PageSyntax}}
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: {{Parameter|result}} = firstValue [[OR]] secondValue
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{{PageDescription}}
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* If both bits are off, it returns 0.
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* If one or both bits are on then it returns 1.
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* [[OR]] never turns off a bit and can be used only to turn a bit on.
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{{Template:LogicalTruthTable}}
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{{PageExamples}}
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''Example 1:'' OR always turns bits on! Never off.
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{{CodeStart}} '' ''
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a% = 5 ' 101 binary
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b% = 4 ' 100 binary
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results% = a% {{Cl|OR}} b% ' still 101 binary using OR
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{{Cl|PRINT}} "Results% ="; results% '' ''
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{{CodeEnd}}
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{{OutputStart}}
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Results% = 5
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{{OutputEnd}}
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''Example 2:'' Turning a data register bit on.
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{{CodeStart}} '' ''
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address% = 888 'parallel port data register
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bytevalue% = {{Cl|INP}}(address%)
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{{Cl|OUT}} address%, bytevalue% {{Cl|OR}} 4 '' ''
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{{CodeEnd}}
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:''Explanation:'' The third register bit is only turned on if it was off. This ensures that a bit is set. OR could set more bits on with a sum of bit values such as: OUT address%, 7 would turn the first, second and third bits on. 1 + 2 + 4 = 7
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{{PageSeeAlso}}
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* [[AND]], [[XOR]]
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* [[AND (boolean)]], [[OR (boolean)]]
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* [[Binary]], [[Boolean]]
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{{PageNavigation}}
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