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Frank
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 Posted: Fri Jul 29, 2005 5:32 am Post subject: What does this statement yield? |
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I am reading other people's code and come across this statement.
Does it mean phase revolve arround 0,1,2 and 3 & 3 makes 0?
Thank you.
phase = 0;
for (i = 0; i <= 100; i++) {
phase=(phase+1)&3;
}
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Alf P. Steinbach
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| Posted: Fri Jul 29, 2005 5:41 am Post subject: Re: What does this statement yield? |
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* Frank:
| Quote: | I am reading other people's code and come across this statement.
Does it mean phase revolve arround 0,1,2 and 3 & 3 makes 0?
Thank you.
phase = 0;
for (i = 0; i <= 100; i++) {
phase=(phase+1)&3;
}
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For integer types '&3' is effectively the same as '%4'.
I.e. for such types the code should yield 101%4 = 1.
If 'phase' is of a user-defined type then nothing can be said.
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
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Frank
Guest
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| Posted: Fri Jul 29, 2005 6:30 am Post subject: Re: What does this statement yield? |
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"Alf P. Steinbach" <alfps (AT) start (DOT) no> wrote
| Quote: | * Frank:
I am reading other people's code and come across this statement.
Does it mean phase revolve arround 0,1,2 and 3 & 3 makes 0?
Thank you.
phase = 0;
for (i = 0; i <= 100; i++) {
phase=(phase+1)&3;
}
For integer types '&3' is effectively the same as '%4'.
I.e. for such types the code should yield 101%4 = 1.
If 'phase' is of a user-defined type then nothing can be said.
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
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Thank you. Understood.
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