Difference between revisions of "Or"
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!align=center| A !! align=center|B !! A or B | !align=center| A !! align=center|B !! A or B | ||
|- | |- | ||
| − | | false || false | + | | false || false |
| − | |style="background: # | + | |style="background: #eeeeee" | false |
|- | |- | ||
| false || true | | false || true | ||
| − | |style="background: # | + | |style="background: #eeeeee" | true |
|- | |- | ||
| true || false | | true || false | ||
| − | |style="background: # | + | |style="background: #eeeeee" | true |
|- | |- | ||
| true || true | | true || true | ||
| − | |style="background: # | + | |style="background: #eeeeee" | true |
|} | |} | ||
Revision as of 10:24, 26 October 2007
Boolean operation
Or produces a value of true if some value is true and false if both of its operands are false.
Truth table
| A | B | A or B |
|---|---|---|
| false | false | false |
| false | true | true |
| true | false | true |
| true | true | true |
Bitwise operation
Bitwise or sets the bit to 1 if one corresponding bits in its operands are 1, and to 0 if they all are 0.
Set a bit
<delphi> function SetBit(const AValue, ABitNumber:integer):integer; begin
result := AValue or (1 shl ABitNumber);
end; </delphi> 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.
