import java.io.*;
import java.lang.*;
//Testing tank
public class testNormal1 {
  public static void main(String[] argn) {
    try {
      Tank t1 = new Tank();
      Tank t2 = new Tank();
      System.out.println("t1 content = "+t1.content());
      System.out.println("t2 content = "+t2.content());
      t1.add(10.0);
      t2.add(1000.0);
      System.out.println("t1 content after adding 10 = "+t1.content());
      System.out.println("t2 content after adding 1000 = "+t2.content());
      t1.remove(5.0);
      t2.remove(50.0);
      System.out.println("t1 content after removing 5 = "+t1.content());
      System.out.println("t2 content after removing 50 = "+t2.content());
    }
	catch (IllegalArgumentException e) {
		System.err.println("Can't add/remove negative amounts");
	}
	catch (Tank.TankOverFlowException e) {
		System.err.println("Tank overflow by "+e.overflow);
	}
	catch (Tank.TankUnderFlowException e) {
		System.err.println("Tank underflow by "+e.underflow);
	}
  }
}