some basic switch-case-question

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return_tr..

some basic switch-case-question

in Programming Questions • 8 months ago

Assume I want to create a window that fits the users screen and I like to use switch-case-contruct for this like in the script shown below

void setup(){
int iw;
int ih;
switch (displayWidth) {
case > 1024:
iw = 1024;
case > 800:
iw = 800;
case > 640:
iw = 640;
default:
iw = 320;
}
switch (displayHeight) {
case > 768:
ih = 768;
case > 600:
ih = 600;
case > 480:
ih = 480;
default:
ih = 240;
}
size(iw, ih, P3D);
}
void draw() {
// don't get here yet :(
}

now my question: can case just select from exact values or can I use comparison-operators like >, >= etc. somehow?
Else I would be forced to use If -contructs instead, sure, but just for interest: Is it possible?

Replies(4)

quarks

Re: some basic switch-case-question

8 months ago

case can only select from exact values.

A tutorial guide to the switch statement can be found here

tfguy44

Re: some basic switch-case-question

8 months ago

Or you can use if statements:

iw = 320;
if( displayWidth >= 640 ) iw = 640;
if( displayWidth >= 800 ) iw = 800;
if( displayWidth >= 1024 ) iw = 1024;
ih = 240;
if( displayHeight >= 480 ) ih = 480;
if( displayHeight >= 600 ) ih = 600;
if( displayHeight >= 768 ) ih = 768;

GoToLoop

Re: some basic switch-case-question

8 months ago

After seeing your avatar now, I remember you as Rene_Miner from SB forum!

Well, here's an alternative version of tfguy44, but now using decreased resolutions w/ else if:
Although it's a lil' more verbose.

But it has the advantage of ignoring the rest of the else if conditions if one already matches!

Similar to break often used inside switch/ case block.

int displayWidth  = 1440;
int displayHeight = 900;

int iw=320, ih=240;

if ( displayWidth >= 1280 )      iw = 1280;
else if ( displayWidth >= 1024 ) iw = 1024;
else if ( displayWidth >= 800 )  iw = 800;
else if ( displayWidth >= 640 )  iw = 640;

if ( displayHeight >= 1024 )     ih = 1024;
else if ( displayHeight >= 768 ) ih = 768;
else if ( displayHeight >= 600 ) ih = 600;
else if ( displayHeight >= 480 ) ih = 480;

println(iw + "\t" + ih);

exit();

return_tr..

Re: some basic switch-case-question

8 months ago

yeah, ok. but I really just wanted to know if Switch + Case accept >,< , <= etc.
I wrote myself (see up there) that I use IF when that does not work...

Now you are too late for the real question (I truly hoped for you to answer that)