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java problem

peterx peter
Greenhorn

Joined: Nov 02, 2004
Posts: 19
Hi!
A parking charge is 2 dollor for up to three houres. After 3 houres the charge increase with 0.5$ every houre.
if a person parks his car 5.3 houres.
He must pay 2$ for first 3 houres and 1.5 dollor for every houre 2+1.5=3.5$

because for 2 hourse we pay 1$ and for 0,3 houre we should pay 0.5 dollor more.



the above codes result is:
2+(0.5*(5.3-3))=3.15$
but it must be 3.5$
because for 2 houres 1$ and for 0.3 houre 0.5$ dollor more.
Henry Wong
author
Sheriff

Joined: Sep 28, 2004
Posts: 18836
    
  40

You need to round the number of hours up to the next half hour first.

If you already know this, (this was not clear in your question), and just want a suggestion on how to do it. I guess one trick is to double the value, round it up to the nearest whole number with the Math class, and half it back.

Henry


Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)
Jerry Olsson
Greenhorn

Joined: Mar 24, 2004
Posts: 15
You can round up the last hour. Round up 0.3 to 1 with Math.ceil();

charge=2+(0.5*(Math.ceil(houre-3)));
Thomas Bigbee
Ranch Hand

Joined: Nov 29, 2001
Posts: 48
Sounds like a homework question to me.
 
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subject: java problem