Looping, help with an equation inside of my loop!

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1.00/5 (1 vote)

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Hello,

I am writing a program to show a population growth for a town over 5 years at a 4% growth rate.
I have my variables and my counter. Here is what I have.

static void Main(string[] args)
      {
          int curntPopulation = 23962;
          int i = 1;
          double growthRate = 1.04;
          double newPopulation;


          while (i <= 5)
          {
              newPopulation = curntPopulation * growthRate;

              newPopulation = newPopulation * growthRate;

              Console.WriteLine("The population of Davidville is: {0}", newPopulation);
              i++;
          }

      }

What I am having difficulties with is displaying the new population for each of the 5 years, currently I am displaying the year two results for all 5 lines. How can I make newPopulation save the current value, store it in the equation and generate the result I am after? Thanks

Posted 9-Aug-13 12:10pm

spin_1085

Updated 9-Aug-13 12:11pm

Richard C Bishop

v2

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Richard C Bishop 9-Aug-13 18:14pm

Your issue is not clear, but why are you multiplying growthRate twice?

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Pheonyx · Accepted Answer · 2013-08-09T12:31:00

C#

static void Main(string[] args)
        {
            int population = 23962;
            int totalNumberOfYears = 5;
            double growthRate = 1.04;

    Console.WriteLine("The population of Davidville is: {0}", newPopulation);

    for(int year = 1; year < totalNumberOfYears; year++)
    {
        population = population * growthRate;

        Console.WriteLine("The population of Davidville in year {0} is: {1}", year, newPopulation);
    }

}

Try that, it should do the job.