Help with Int and JOption Input dialog

[stephanie904]

Im doing calculations for world population and I already have a formula and everything is working, but my question is when it asks to put "Enter years to see World Population Growth" what do i need to put for my int c when int c is unknown???? please help....

import java.util.Scanner;
import javax.swing.JOptionPane;

public class Population {
     
	
	public static void main(String[] args) {
	Scanner input = new Scanner( System.in );
	
	   int a = 7;
	   double b = 1.0114;
           int c;
	   double answer = c * a + b;
		
      JOptionPane.showMessageDialog(null, "Welcome to World population profile!\nCurrent world population of year 2012 is 7 billion\nand current world population growth rate of year 2012 is 1.14%"); 

		String years =  
		   JOptionPane.showInputDialog( "Enter years to see World Population Growth ");
			
			
		String message = 
		   String.format( "World Population Growth in %s years is " , years );
			
			
		JOptionPane.showMessageDialog(null, message + answer);	
	
	}
}

[Fubarable]

You've got things a little backwards in that you're trying to create your equation before you know the data to put in, and that won't work. Instead you will want to get your input first, and then use the inputted value in your equation.