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➜ SMAUG
➜ SMAUG coding
➜ xp_compute math question
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| Posted by
| Robert Powell
Australia (367 posts) Bio
|
| Date
| Tue 19 Jul 2005 09:15 AM (UTC) |
| Message
| could someone explain to me what the >> 2 does in the following fragment.
xp = (xp*3) >> 2; |
Just a guy having a bit of fun. Nothing more, nothing less, I do not need I WIN to feel validated. | | Top |
|
| Posted by
| David Haley
USA (3,881 posts) Bio
|
| Date
| Reply #1 on Tue 19 Jul 2005 08:07 PM (UTC) |
| Message
| >> 2 means bitwise shift right by two.
If you have the number 4, which is 100 in binary, then 4 >> 1 is equal to 10 which is 2. 4 >> 2 equals 1 which is 1. 5 in binary is 101, so 5 >> 1 = 2 and 5 >> 2 = 1.
The quick answer is that "x >> 2" is an extremely efficient way to (integer-)divide x by two. |
David Haley aka Ksilyan
Head Programmer,
Legends of the Darkstone
http://david.the-haleys.org | | Top |
|
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