Shr: what changed

Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.

Title: Shr

New		Line
1	+	Back to [[Reserved words]].
2	+
3	+	## Overview
4	+
5	+	The reserved word Shift right (shr) performs a logical right bit-shift operation (opposite than [[Shl\|shl]]).
6	+
7	+	Example:
8	+
9	+	`Command is: 00000100 shr 2 (shift right 2 bits)`\
10	+	` `\
11	+	`Action is: 00000100 -> 00 (00 gets added to the left of the value; right 00 "disappears")`\
12	+	` `\
13	+	`Result is: 00000001`
14	+
15	+	## Shr with signed types
16	+
17	+	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\|typecast]] and extension to a larger unsigned type may be performed before the shift operation. Check what the following program actually prints.
18	+
19	+	``` pascal
20	+	program ShrTest;
21	+	begin
22	+	WriteLn(ShortInt(-3) shr 1);
23	+	end.
24	+	```
25	+
26	+	## Is a bit set
27	+
28	+	``` pascal
29	+	function isBitSet(AValue, ABitNumber:integer):boolean;
30	+	begin
31	+	result:=odd(AValue shr ABitNumber);
32	+	end;
33	+	```
34	+
35	+	- [[Const]]
36	+	- [[Function]]
37	+	- [[Integer]]
38	+
39	+	---
40	+	From the Free Pascal wiki, page "Shr", as it stood on 2021-09-01 after a change by Mozi, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's [[Licensing]] page. If you have concerns about this material, [message the admin](/wiki-contact).