What does this statement yield?

[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;
}

 

[Alf P. Steinbach]

* 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.

 

[Frank]

* Frank:

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.

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Thank you. Understood.