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Index › Programming Questions & Help › Syntax Questions › odd and even number
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odd and even number (Read 1592 times)
milc
odd and even number
Jun 24th, 2008, 2:17pm  
Hi,

is there a way that P5 can detect odd and even number?
let's say

if (sec > 1.0){
   x = 25;
 }
 
  if (sec > 2.0){
   x = 50;
   
 }

and I want to control this like, when "sec" variable is odd number function 1, and if it's even number function 2...etc.

If not I have to write the same thing each second...

'hope that my question is clear....
thank you.
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koogy
Re: odd and even number
Reply #1 - Jun 24th, 2008, 2:52pm  
is it an int? it looks like a float in your example

for ints, check the lowest bit

if ((sec & 1) == 0) {
 // even
} else {
 // odd
}

http://processing.org/reference/bitwiseAND.html

(if it's a float, cast it to an int before the test)
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jakub
Re: odd and even number
Reply #2 - Jun 24th, 2008, 2:57pm  
or you can use modulo functionality as in: http://processing.org/reference/modulo.html

simple code:
if(sec%2 == 0) //even
else //odd

hope it will help you Wink
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www.chamicewicz.com
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milc
Re: odd and even number
Reply #3 - Jun 25th, 2008, 3:41pm  
Thanks for the replies!

actually, it doesn't seem to work out, but I don't believe that it's the even/odd number detect method.

the thing is that I have this impression that the millis() function can't detect the time at integer number.

//this is how I declared sec variables

float sec = millis() /1000.0;

//this will compare the integer numbers like,
//1.0, 2.0, 3.0.....etc.

 if (sec%2 == 0){
   x = 50;
 }else{
   x = 100;
 }

But I think the sec variables will never output 1.0 but rather 1.152749246205....something like that.

am I right?

if so, how can I write this binary function?
in even number second do this
and in odd number second do that,
in following the internal clock of my macBook of course...

thank you so much for helps so far anyway....
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JohnG
Re: odd and even number
Reply #4 - Jun 25th, 2008, 3:52pm  
You can test the integer version of the value like this:

Code:
float sec = millis() /1000.0; 
if((int)sec%2==0)
{
  //even.
}
else
{
  //odd
}
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milc
Re: odd and even number
Reply #5 - Jun 25th, 2008, 4:43pm  
it works perfectly,

thanks a lot!
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