php - why does this happen? - GoFuckYourself.com

cj-design · 07-11-2003, 11:08 AM

PHP Code:


			
$rrp = "19.99";

$price = "14.99";

$saving = $rrp - $price;

$adding = $rrp + $price;



print "RRP: $rrp";

print "<p>";

print "Price: $price";

print "<P>";

print "Saving $saving";

print "<P>";

print "Added Together $adding";

Output:

RRP: 19.99
Price: 14.99

Saving 5

Added Together 34.98

What happened to the decimal places on the saving?

cezam · 07-11-2003, 11:13 AM

it's 5.00, so print strips the decimal places off.

printf is your friend, check manual.

jovigirl · 07-11-2003, 11:13 AM

i dont wanna buy zoom glasses

Brujah · 07-11-2003, 11:13 AM

it doesn't keep the format, you can use sprintf to do it.. instead of print.

$saving = sprintf( "%01.2f", $rrp - $price );

http://www.php.net/sprintf

rowan · 07-11-2003, 11:15 AM

Be careful using decimal places for pricing, you can get some strange effects with floats... probably better to calculate everything in cents internally (as a whole number), and then divide it by 100 to display it.

cj-design · 07-11-2003, 11:22 AM

cheers boys.

Thorin · 07-11-2003, 11:40 AM

Quote:

Originally posted by cj-design
What happened to the decimal places on the saving?

...

PHP/MySQL Programmer

Wow...

Freestyleman · 07-11-2003, 11:42 AM

Quote:

Originally posted by Thorin

Wow...

JamesK · 07-11-2003, 11:44 AM

Quote:

Originally posted by jovigirl
i dont wanna buy zoom glasses

HAHAHAHAAHAHHA

07-11-2003, 11:08 AM	#1
cj-design Confirmed User Join Date: Apr 2003 Location: England Posts: 378	php - why does this happen? PHP Code: `$rrp = "19.99"; $price = "14.99"; $saving = $rrp - $price; $adding = $rrp + $price; print "RRP: $rrp"; print "<p>"; print "Price: $price"; print "<P>"; print "Saving $saving"; print "<P>"; print "Added Together $adding";` Output: RRP: 19.99 Price: 14.99 Saving 5 Added Together 34.98 What happened to the decimal places on the saving?

07-11-2003, 11:13 AM	#2
cezam Confirmed User Join Date: Jun 2003 Location: CZ, EU Posts: 1,363	it's 5.00, so print strips the decimal places off. printf is your friend, check manual. __________________

07-11-2003, 11:13 AM	#3
jovigirl Confirmed User Join Date: Apr 2003 Location: On the edge Posts: 1,796	i dont wanna buy zoom glasses __________________ ICQ :333-548-380

07-11-2003, 11:13 AM	#4
Brujah Beer Money Baron Industry Role: Join Date: Jan 2001 Location: brujah / gmail Posts: 22,157	it doesn't keep the format, you can use sprintf to do it.. instead of print. $saving = sprintf( "%01.2f", $rrp - $price ); http://www.php.net/sprintf __________________ Free Premium Domain Lists and Tools at Clickmojo.com For Sale: Obscenity.com

07-11-2003, 11:15 AM	#5
rowan Too lazy to set a custom title Join Date: Mar 2002 Location: Australia Posts: 17,393	Be careful using decimal places for pricing, you can get some strange effects with floats... probably better to calculate everything in cents internally (as a whole number), and then divide it by 100 to display it.

07-11-2003, 11:22 AM	#6
cj-design Confirmed User Join Date: Apr 2003 Location: England Posts: 378	cheers boys.