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Thread: Population class

  1. #1

    Default Population class

    I have made a class that gets the starting population, the percent increase daily and the number of days the organisms will be multiplied.
    public class popul
    {
    	//Creakte private fields
    	private double pop_organism;
    	private int percentIncrease;
    	private int days_multiply;
    	private double new_population=0;
     
     
    	//Make a contructor
    	public popul()
    	{
    		pop_organism=0;
    		percentIncrease=0;
    		days_multiply=1;
    	}
    	//take in a argument
    	public void get_popPercent_daysMult(double population,int percent,int days_mult)
    	{
    		pop_organism=population;
    		percentIncrease=percent;
    		days_multiply=days_mult;
    	}
     
    	public void calculate_increase()
    	{
     
    		for(int counter=1;counter<=days_multiply;counter++)
    		{
    			pop_organism=(pop_organism*(percentIncrease/100))+pop_organism;
    			System.out.print("Day"+ " "+counter+ " : "+pop_organism);
     
    		}
    	}
    }]

    My problem seems to lie in the public void calculate_increase method. For some aparents reason I'm getting
    day 1 : 4.0 day 2: 4.0 day 3: 4.0 day 4: 4.0 day 5: 4.0
    I have been working on this for one hour but just can't seem to figure it out! Thanks guys in advance oh and my sample input I'm using is

    pop_organism=4;
    percentIncrease=20;
    days_multiply=5;


  2. #2
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    Default Re: Population class

    Yow,
    you have private int percentIncrease (Instance variable)
    and you also have this parameter in get_popPercent_daysMult
    the problem is: it is in Integer. It should be double since your dealing
    with a number that might consist of decimal values.


    Alternative:
    you can divide the percent by 100.0 instead of 100
    that will make your result auto cast to double data type.
    Last edited by dicdic; March 11th, 2014 at 11:33 PM.

  3. The Following User Says Thank You to dicdic For This Useful Post:

    GregBrannon (March 12th, 2014)

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