Difference between revisions of "Or"
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= Bitwise operation = | = Bitwise operation = | ||
− | Logical '''Or''' (aka Bitwise Or) requires ordinal operands and sets the | + | Logical '''Or''' (aka Bitwise Or) requires ordinal operands and sets and a bit in the result variable to 1 if one corresponding bit in its operands is 1, and to 0 if both are 0. |
== Set a bit == | == Set a bit == |
Revision as of 04:56, 14 June 2016
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Boolean operation
Boolean Or produces a value of true if some value is true and false if both of its Boolean operands are false.
Truth table
A | B | A or B |
---|---|---|
false | false | false |
false | true | true |
true | false | true |
true | true | true |
Bitwise operation
Logical Or (aka Bitwise Or) requires ordinal operands and sets and a bit in the result variable to 1 if one corresponding bit in its operands is 1, and to 0 if both are 0.
Set a bit
function SetBit(const AValue, ABitNumber:integer):integer;
begin
result := AValue or (1 shl ABitNumber);
end;
If you call SetBit(%1000,1) then get %1010 (%1000 = 8 and %1010 = 10). If you call SetBit(10,2) then get 14 (14 = %1110). If you call SetBit(10,1) then get 10.
See also