Difference between revisions of "Shr"
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| − | '''Sh'''ift '''r'''ight (shr) performs a right bit-shift operation (opposite than [[Shl|shl]]). | + | '''Sh'''ift '''r'''ight (shr) performs a logical right bit-shift operation (opposite than [[Shl|shl]]). |
| + | == Shr with signed types == | ||
| + | Note: unlike the >> operator in the C language, the shr operator is a logical (not arithmetic) bit shift, even if the left operand is a signed integer. An implicit typecast and extension to a larger unsigned type may be performed before the shift operation. Check what the following program actually prints. | ||
| + | |||
| + | <syntaxhighlight> | ||
| + | program ShrTest; | ||
| + | begin | ||
| + | WriteLn(ShortInt(-3) shr 1); | ||
| + | end. | ||
| + | </syntaxhighlight> | ||
== Is a bit set == | == Is a bit set == | ||
Revision as of 12:39, 4 June 2014
Overview
Template:shr
Shift right (shr) performs a logical right bit-shift operation (opposite than shl).
Shr with signed types
Note: unlike the >> operator in the C language, the shr operator is a logical (not arithmetic) bit shift, even if the left operand is a signed integer. An implicit typecast and extension to a larger unsigned type may be performed before the shift operation. Check what the following program actually prints.
program ShrTest;
begin
WriteLn(ShortInt(-3) shr 1);
end.Is a bit set
function isBitSet(AValue, ABitNumber:integer):boolean;
begin
result:=odd(AValue shr ABitNumber);
end;