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Index › Programming Questions & Help › Syntax Questions › sequneces of numbers
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sequneces of numbers (Read 352 times)
milc
sequneces of numbers
Oct 28th, 2007, 9:15pm  
dear advanced coders,

I have this sequence of numbers goes like,
5, 15, 25, 35, 45, 55......so on until 500. (n+=10)

I want divide this into two sequence of numbers as 5, 25, 45, 65...etc.
and 15, 35, 55, 75....etc.

But I have no idea which math formula to use for that.

for example,

Quote:




size(501,501);
background(255);
smooth();

for (int y=5; y<height; y+=10){
 for (int x=5; x<width; x+=10){

   ellipse(x,y,10,10);
println(x);
 }

}





I want that one row of circles to be black and after red, than balck, red....so on.

I was thinking about using array, but how??? no idea!

I hope that my question is clear....

thank you.
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fjen
Re: sequneces of numbers
Reply #1 - Oct 28th, 2007, 9:53pm  
you need an on-off-switch:

Code:

size(501,501); 
background(255); 
smooth(); 

boolean aSwitch = false;

for (int y=5; y<height; y+=10)
{
    if ( aSwitch ) fill( 0 );
    else fill( color( 255, 0, 0 ) );
    
    for (int x=5; x<width; x+=10)
    {
        ellipse(x,y,10,10); 
        println(x); 
    } 
    
    aSwitch = !aSwitch; // flip to opposite
}


F
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milc
Re: sequneces of numbers
Reply #2 - Oct 28th, 2007, 10:10pm  
thank you for the reply, it works perfectly!

in the terminal, it flips ture/false each time the first loop excute, I don't fully understand yet, but I'll try to apply this to different situations to understand better.

thank you again for quick & kind answer.
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