Rounding numbers to either x or y

[WillyTheFish]

Hey guys,

already posted this problem once, sorry about that, but i was a little unclear in what i wanted to do and still couldn't figure it out on my own.

 

 

as you see below i have the number 215 which i want to round so that it end with $v1 or $v2, depending on what is closer to it...

I want to return 4 possible outcomes in $a,$b,$c and $d...

so $a = 145, $b = 195, $c = 245 and $d = 295.... as you see, all of them ending with either $v1 or $v2.

I tried to write the code so that it will work with all kinds of numbers, if i change the variables $number, $v1 and $v2, but failed so far...

This also needs to work for $number = 4.6, $v1 = 0.5 and $v2 = 0.9  if you get what i mean.

 

 

		
	$v1 = 45;
	$v2 = 95;
	$number = 215;

	$num_len = strlen(round($number));
	$v_len = strlen(round($v1));


	$a = (floor($number/pow(10,$num_len-1)) + $v1/pow(10,$v_len)) * pow(10,$num_len-1);
	$b = (floor($number/pow(10,$num_len-1)) + $v2/pow(10,$v_len)) * pow(10,$num_len-1);
	$c = (ceil($number/pow(10,$num_len-1)) + $v1/pow(10,$v_len)) * pow(10,$num_len-1);
	$d = (ceil($number/pow(10,$num_len-1)) + $v2/pow(10,$v_len)) * pow(10,$num_len-1);

 

please help so i can move on thanks!

 

[jcanker]

Maybe I'm misunderstanding what you're trying to do, but the way I see it, you want to basically ignore any of the digits preceding the last two (or however many are in (V1 and $v2)

 

Perhaps you could:

$strlength = $number; //get the string length
$testnum = substr($number,-2) //pulls the last two from the string
$testround1 = $testnum - $v1;
$testround2 = $v2 - $testnum;
if ($testround1 < $testround2)
$newnum = substr($number,0,($strlength-2)) .$testround1;
else 
$newnum = substr($number,0,($strlength-2)) .$testround1;

 

I'll be honest  and admit that I didn't bother thinking through about decimals, but I bet you could use the string functions to search for a decimal point and alter the number sufficiently and reverse the operation later if necessary...

 

I hope I'm not blowing smoke around with what you're trying to do...This solution seems a bit simple to me, but sometimes we get lost in the rush to find a solution and ignore the easy and obvious...then again, maybe I'm completely misunderstanding what you want to accomplish....