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Nov 12th, 2008

Time Calculator

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Can anyone help me please? i need to create a program in which you enter a distance and the program will tell you how long it will take to get there in hours minutes and seconds.

My trouble is that they all display independently and not seperately ... for example ... i want it to display "1 hour 20mins 4 seconds" instead of "1.20 hours 80 mins" and how ever many in seconds.

thank you in advance for your help

java Syntax (Toggle Plain Text)
 public class Travel{
 
    public static void main (String [] argv){
 
        //variables
        final float kph =85;
              float distance;
              float sec;
              float min;
              float hour;
              float subtot;
             // float total;
            //  float grandtot;
 
              // prints out user prompt 
              System.out.println("Please Enter the Distance: ");
                distance = UserInput.readFloat ();
 
                // formula to work out length of travel 
                subtot = distance/kph;
               // hour = subtot%10;
 
               // total = distance/kph*60;
               // min = total%10;
 
               // grandtot = distance/kph*60*60;
               // sec = grandtot%10;
 
               min = subtot*60;
               hour = min % 60;
               sec = min*60;
               //total= subtotal*60;
 
               // total = distance/kph;
 
                //timeInMin = 
 
               System.out.println("Time in Hours: "+hour); 
               System.out.println("Time in Minutes: "+min); 
               System.out.println("Time in seconds: "+sec);
               System.out.println("The Total Time is: "+hour+":"+sec+":"+min);
 
    }
}
 public class Travel{

    public static void main (String [] argv){
        
        //variables
        final float kph =85;
              float distance;
              float sec;
              float min;
              float hour;
              float subtot;
             // float total;
            //  float grandtot;
              
              // prints out user prompt 
              System.out.println("Please Enter the Distance: ");
                distance = UserInput.readFloat ();
                
                // formula to work out length of travel 
                subtot = distance/kph;
               // hour = subtot%10;
                                           
               // total = distance/kph*60;
               // min = total%10;
                
               // grandtot = distance/kph*60*60;
               // sec = grandtot%10;
               
               min = subtot*60;
               hour = min % 60;
               sec = min*60;
               //total= subtotal*60;
                               
               // total = distance/kph;
                
                //timeInMin = 
              
               System.out.println("Time in Hours: "+hour); 
               System.out.println("Time in Minutes: "+min); 
               System.out.println("Time in seconds: "+sec);
               System.out.println("The Total Time is: "+hour+":"+sec+":"+min);
        
    }
}

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detoxx

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Nov 12th, 2008

Re: Time Calculator

For staters, you don't need to be using floats for hour, sec, min and this is where a lot of your issues will be starting.

If you avoid decimal multiplication / division, you will probably get results closer to what you want. e.g. 1.20 = 1 in int (I am referring to your hours).

After you calculate hours, you need to take this into account when calculating the minutes. After you get the minutes you need to take this & hours into account when you calculate the seconds.

Hope this helps...

sillyboy

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Nov 12th, 2008

Re: Time Calculator

I think that this if kph means speed than distance/kph means time in hours you don't need variable hours. you can simlply write

Java Syntax (Toggle Plain Text)
System.out.println("Time in Hours: "+subtot);
System.out.println("Time in Hours: "+subtot);

Last edited by tonief; Nov 12th, 2008 at 7:47 pm.

tonief

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Nov 12th, 2008

Re: Time Calculator

Use % and / to do this.

BestJewSinceJC

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Posting Maven

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Nov 13th, 2008

Re: Time Calculator

In Physics everything is measured in meters and seconds.
So after you get the speed and distance, Convert both to meters/sec and meters. After you do the division you will have a clean value in seconds which can be easily converted to minutes and hours.
If the final value has decimal points: 65.33 seconds then keep them at the seconds value or round them or have another variable for miliseconds:
1 minute and 5.33 seconds or
1 minute and 5 seconds or
1 minute and 5 seconds and 330 milliseconds

javaAddict

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Nov 13th, 2008

Re: Time Calculator

Thank you for your posts!! it is really appreciated

i will give it a go and let you know how it turns out.

thanks again

detoxx

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Nov 18th, 2008

Re: Time Calculator

I tried using the modulo and i still get decimals.

I also tried changing my some of my floats to integers, but my compiler will not let it compile as it says "Possible Loss of Precision"

is there anyway around this?

p.s I changed the hour, min and sec to int

detoxx

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Nov 18th, 2008

Re: Time Calculator

How about some code

javaAddict

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Nov 18th, 2008

Re: Time Calculator

its the same as above ....

only thing is i changed the floats (hour, min, sec) to int.

java Syntax (Toggle Plain Text)
//variables
        final float KPH =85;
              float distance;
              int sec;
              float min;
              float hour;
              float subtot;
//variables
        final float KPH =85;
              float distance;
              int sec;
              float min;
              float hour;
              float subtot;

http://img230.imageshack.us/my.php?image=javaza8.jpg

Last edited by detoxx; Nov 18th, 2008 at 9:36 am. Reason: added image of compiler

detoxx

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Nov 18th, 2008

Re: Time Calculator

Click to Expand / Collapse Quote originally posted by detoxx ...

... for example ... i want it to display "1 hour 20mins 4 seconds" instead of "1.20 hours 80 mins" and how ever many in seconds. ...
java Syntax (Toggle Plain Text)
 
               min = subtot*60;
               hour = min % 60;
               sec = min*60;
min = subtot*60; hour = min % 60; sec = min*60;

Java Syntax (Toggle Plain Text)
min = subtot * 60;
if ( min >= 60){
  hour = min%60;
}
else{
  hour = 0;
}
 
if (hour != null){
  min -= (hour*60);
}
min = subtot * 60;
if ( min >= 60){
  hour = min%60;
}
else{
  hour = 0;
}

if (hour != null){
  min -= (hour*60);
}

that should fix that. once you've taken them as hours, subtract the right amount of minutes from min to get the correct answer

stultuske

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