固定利率数组

Question

i have to find Population for pond . it has starting population when user input n after that use input Fixed rate for the population finally user input for how many gerbartion to calculate the current population . Im stuck at array of calculation how write the code it .can someone help me.Thax

import java.util.Scanner;
public class population {

    private static final int TARGET = 6000;

    public static void main(String[] args) {
        int iStartingPopulation,iFGeneration,iRate;

        int[] iGrowthRate = new int[10];



        Scanner inConsole = new Scanner (System.in);

        //  Read the starting population of the fish pond
        System.out.println(" Enter the starting population of the Fish pond");
        iStartingPopulation= inConsole.nextInt();

    // Ask whether the growth rate is fixed or variable  
        System.out.println(" Enter F for fixed growth rate of the pond, V for Variable ");
        char option = inConsole.next().charAt(0);

        if ( option ==('f') || option==('F')){

        //Read the fixed Growth Rate 
        System.out.println("Enter the fixed growth rate for genration:");
        iRate = inConsole.nextInt();

        //Read the fixed Growth for how many Generation 
        System.out.println("Enter How many Generation for:");
         iFGeneration= inConsole.nextInt(); 



int iFCurrentPopulation= iStartingPopulation;


        for (int iI =0; iI < iFiGeneration; iI++)
        {
            iFCurrentPopulation = iFGeneration+( iFCurrentPopulation *iRate /100);
            System.out.println("Population :" +""+iFCurrentPopulation);

Answer 1

You pretty much have the solution in your comment; you even have the extra variable required to keep the population as is when dividing in your formula.

for (int i = 0; i < iFGeneration; i++) {
    iFCurrentPopulation += ((iFCurrentPopulation * iRate) / iStartingPopulation);
}

Note: this will produce an int (obviously) as the result - where as if you want decimal places etc, you should use a double .

Example:

Initial population = 100

Fixed Rate = 80

Generation = 3

Will produce 583 (as an int ), but in reality the figure would be 583.2 (as a double ).

See it online!