I'm a beginning java programmer. I'm trying to write a simple program to calculate how much of a substance remains in your body based on the half-life of the substance, and when equilibrium will be reached based on when and how the medication is taken (the latter is not yet complete).
I initially had troubles with a resource leak on my scanner, but I found the answer to that here. However, now that I've fixed the scanner, I can't seem to initialize a constant double variable as user input. The scanner itself WORKS, and the variable gains the input value, however java keeps rejecting it saying "DOSE cannot be resolved to a variable". I even put a System.out.println(DOSE); after the scanner input to test if the scanner was working, and it was. But the program will not run unless I initialize the variable further down in the program, which just overwrites the previously, successfully input value for DOSE!
I currently have the final double DOSE = 5 initialization commented, which is what throws the error. If I take those comment slashes out, then the program works fine, but the user input is irrelevant.
I tried to find the solution on here but I was unsuccessful.
package halflife;
import java.util.Scanner;
public class HalfLifeCalculation {
public static void main(String[] args) {
//variables scanner designated
Scanner input = new Scanner(System.in);
try {
System.out.print("Enter your daily dose: ");
double DOSE = input.nextDouble();
System.out.println(DOSE);
} finally {
input.close();
} //try end
//variables pre-set
int day = 2;
//final double DOSE = 5;
final double HALFLIFE = 0.175;
double result = (DOSE*HALFLIFE);
//pre-calculated header
System.out.println("Day 1\nRemaining substance is " + result + " mg\n");
//while loop calculation
while (day < 101) {
System.out.println("Day " + day);
System.out.println("Remaining substance is " + (result = (result + DOSE)*HALFLIFE) + " mg\n");
day++;
} //while end
} //main end
} //class end
