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Thread: Question on my math

  1. #1
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    Exclamation Question on my math

    So in computer science we keep getting pounded with assignments and homework!!

    And on one assignment its a parking garage program which asks you how long you parked (in minutes) then charges you 75 cents for each hour. i got that part but if you stay for part of an hour you have to pay for tha full hour. How would i do that? Im off by like 1 minute and have an infinite loop which freezes my computer.

    All help is very much appreciated

    import java.io.*;
    public class Temp {
     
        public static void main(String[] args) throws IOException {
        	BufferedReader input= new BufferedReader(new InputStreamReader(System.in));
     
            int minutesstayed;
            System.out.println("Welcome to NO DENTS PARKING GARAGE");
            System.out.println();
            System.out.println("How long did you park for (in minutes)"); 
            minutesstayed=Integer.parseInt(input.readLine()); 
            int result=minutesstayed/60;
            double result2=result+0.75;
            double charge=0.75*(minutesstayed/60)+result2;
            for(result=1;result<=10;result2++)
     
            System.out.println("Your Parking Fee is:"+" "+charge);
     
     
        }  
    }


  2. #2
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    Default Re: Question on my math

    Have you ever used the modulus operator? It returns the remainder of a division.

    So...
    int a = 4 % 2;
    System.out.println(a)
    Prints: 0

    and...
    int b = 12 % 7;
    System.out.println(b);
    Prints: 5

    That is 12 / 7 = 1 with a remainder of 5
    Last edited by helloworld922; October 25th, 2009 at 06:41 PM.

  3. #3
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    Default Re: Question on my math

    yeah ive used modulus. I didnt think i needed it. Where would i use it?

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    Default Re: Question on my math

    int minutes = Integer.parseInt(in.readLine());
    int hours = minutes / 60;
    if (minutes % 60 > 0)
        hours++;

    If minutes modulo 60 is greater than zero, it adds another hour to the bill.

  5. #5
    Super Moderator helloworld922's Avatar
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    Default Re: Question on my math

    Convert the number of hours parked to a double, then use Math.ceil().

    edit:

    err, I just realized a flaw in this approach. Math.ceil() will still round up if you have 1.0 hrs (or some other "integer" hour value). Go with what literallyjer said

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