Lerneaen_Hydra

//assignment 7, lab 2
//convert different currencies

import java.util.*;

public class ass7{
	public static void main(){
		double cash_in;
		Currencyconv sek_pula = new Currencyconv(1.65);
		Currencyconv sek_rand = new Currencyconv(1.14);
		Scanner s = new Scanner(System.in);
		System.out.println("How many SEK? Result in pula");
		cash_in = s.nextDouble();
		System.out.println("That is "+sek_pula.returnCurr2(cash_in)+" Pula");
	}
}

class Currencyconv{
	
	/*
	This class assumes that the exchange rate is in the format of 
	curr1/curr2, that is to say that if an instance is called sek_usd the 
	rate should be around 8 or so
	*/
	
	//internal variables
	
	private double cash_in, cash_out, rate;
	
	//constructors
	
	public Currencyconv(double rate_in){
		if(rate_in < 0){
			rate=0;
		}
		else{
			rate=rate_in;
		}
	}
	
	//methods
	
	//returns currency 2 given currency 1
	
	public double returnCurr2(double cash_in){
		if( cash_in < 0){
			cash_out=0;
		}
		else{
			cash_out=cash_in*rate;
		}
		return cash_out;
	}
	
	//returns currency 1 given currency 2
	
	public double returnCurr1(double cash_in){
		if( cash_in < 0){
			cash_out=0;
		}
		else{
			cash_out=cash_in/rate;
		}
		return cash_out;
	}
	
	//set the exchange rate to something different
	
	public void changeRate(double rate_in){
		if( rate_in < 0){
			rate=0;
		}
		else{
			rate=rate_in;
		}
	}
}