class Polozka {
	public double suma;
	public Polozka dalsi;

	public Polozka(double suma) {
		this.suma = suma;
	}
}

class Ucet {
	public String jmeno;
	private Polozka vklady;
	private Polozka vybery;
	public boolean existuje;
	
	public Ucet(String jmeno) {
		this.jmeno = jmeno;
		this.existuje = true;
	}
	
	public void Vloz(double suma) {
		if (this.vklady == null) {
			this.vklady = new Polozka(suma);
		} else {
			Polozka x = this.vklady;
			while(x.dalsi != null) {
				x = x.dalsi;	
			}
			x.dalsi = new Polozka(suma);	
		}
	}
	
	public void Vyber(double suma) {
		if (this.vybery == null) {
			this.vybery = new Polozka(suma);
		} else {
			Polozka x = this.vybery;
			while(x.dalsi != null) {
				x = x.dalsi;	
			}
			x.dalsi = new Polozka(suma);	
		}
	}
	
	public double sectiVklady() {
		double soucet = 0.;
		if (this.vklady == null) {
			return 0;
		} else {
			Polozka x = this.vklady;
			soucet+= x.suma;

			while(x.dalsi != null) {
				x = x.dalsi;
				soucet+= x.suma;
			}
			return soucet;
		}
	}

	public double sectiVybery() {
		double soucet = 0.;
		if (this.vybery == null) {
			return 0;
		} else {
			Polozka x = this.vybery;
			soucet+= x.suma;

			while(x.dalsi != null) {
				x = x.dalsi;
				soucet+= x.suma;
			}
			return soucet;
		}
	}

	public void vypisVklady() {
		if (this.vklady != null) {
			Polozka x = this.vklady;
			System.out.println("      " + x.suma);

			while(x.dalsi != null) {
				x = x.dalsi;
				System.out.println("      " + x.suma);
			}
		}
	}

	public void vypisVybery() {
		if (this.vybery != null) {
			Polozka x = this.vybery;
			System.out.println("      " + x.suma);

			while(x.dalsi != null) {
				x = x.dalsi;
				System.out.println("      " + x.suma);
			}
		}
	}


	public boolean maDebet() {
		return (this.sectiVklady() - this.sectiVybery() < 0);
	}
}


public class Ucty {
	public static void Tiskni(String line) {
		System.out.println(line);
	}
	
	public static void Tiskni(String line, boolean newline) {
		if (newline) {
			System.out.println(line);
		} else {
			System.out.print(line);
		}
	}
	
	public static void Help() {
		Tiskni("");
		Tiskni("Napoveda");
		Tiskni("-------------------------------------------------------------");
		Tiskni("*<ucet>    - zalozi ucet <ucet> a nastavi ho jako aktivni.");
		Tiskni("/<ucet>    - smaze ucet <ucet> a vynuluje aktivni ucet.");
		Tiskni("+<castka>  - vlozi na aktivni ucet castku <castka>.");
		Tiskni("-<castka>  - vybere z aktvniho uctu castku <castka>.");
		Tiskni("<ucet>     - nastavi jako aktivni ucet <ucet>.");
		Tiskni("=          - zobrazi informace o aktivnim uctu.");
		Tiskni("?          - zobrazi tuto napovedu.");
		Tiskni(".          - ukonceni programu.");
		Tiskni("-------------------------------------------------------------");
		Tiskni("");
	}
	
	public static void main(String[] args) {
		String Command,Param;
		int Aktual = -1;
		int index = -1;

		char Action;

		Ucet[] Ucty = new Ucet[100];

		// nejaky about + help
		Tiskni("-------------------------------------------------------------");
		Tiskni("Program UCTY\tMartin Sloup, FAV INI-B, A04372");
		Tiskni("");
		Tiskni("Tato demoverze umi pracovat s maximalne 100 uctama.");
		Tiskni("-------------------------------------------------------------");
		Tiskni("");
		Help();

		// nekonecny cyklus
		while(true) {
			Tiskni("> ", false);
			Command = VstupData.ctiString();
			Action = Command.charAt(0);
			Param = Command.substring(1);
					
			switch(Action) {
				case '*':
					index = -1;
					for(int i=0; i<100; i++) {
						if (Ucty[i] == null) {
							index = i;
							break;
						}
						if (Ucty[i].jmeno.equals(Param)) break;
					}
					if (index >= 0) {
						Ucty[index] = new Ucet(Param);
						Aktual = index;
						Tiskni("Ucet " + Param + " byl vytvoren.");
					} else {
						Tiskni("CHYBA: Ucet " + Param + " nebyl vytvoren (existuje? pocet uctu >= 100?).");
					}	
					break;
				case '/':
					index = -1;
					for(int i=0;i<100;i++) {
						if (Ucty[i] != null && Ucty[i].jmeno.equals(Param)) {
							Ucty[i] = null;
							index = i;
							break;
						}
					}
					if (index >= 0) {
						Tiskni("Ucet " + Param + " byl smazan.");
					} else {
						Tiskni("CHYBA: Ucet " + Param + " nebyl nalezen.");
					}
					break; 
				case '+':
					// zamenime ceskou carku za tecku. jako oddelovac desetineho mista
					Param = Param.replaceAll(",",".");
					
					try {
						if (Aktual < 0) {
							Tiskni("CHYBA: Neni vybran ucet.");
						} else if (Param != "" && Double.parseDouble(Param) <= 0) {
							Tiskni("CHYBA: Zadej kladne nenulove cislo.");
						} else {
							Tiskni("Na ucet byla vlozena castka " + Double.parseDouble(Param) + ".");
							Ucty[Aktual].Vloz(Double.parseDouble(Param));
						}
					} catch (Exception e) {
						Tiskni("CHYBA: Zadej kladne nenulove cislo.");
					}
					break;
				case '-':
					// zamenime ceskou carku za tecku. jako oddelovac desetineho mista
					Param = Param.replaceAll(",",".");

					try {
						if (Aktual < 0) {
							Tiskni("CHYBA: Neni vybran ucet.");
						} else if (Param != "" && Double.parseDouble(Param) <= 0) {
							Tiskni("CHYBA: Zadej zaporne nenulove cislo.");
						} else {
							Tiskni("Z uctu byla vybrana castka " +Double.parseDouble(Param) + ".");
							Ucty[Aktual].Vyber(Double.parseDouble(Param));
						}
					} catch (Exception e) {
						Tiskni("CHYBA: Zadej zaporne nenulove cislo.");
					}
					break;
				case '=':
					if (Aktual < 0) {
						Tiskni("CHYBA: Neni vybran ucet.");
					} else {
						Tiskni("Informace u uctu "+Ucty[Aktual].jmeno+":");
						Tiskni("-------------------------------------------------------------");
						Tiskni("    Vlozeno:  " + Math.round(Ucty[Aktual].sectiVklady()*2)/2. + "0");
						Tiskni("    Vybrano:  " + Math.round(Ucty[Aktual].sectiVybery()*2)/2. + "0");
						Tiskni("    Ma Debet: " + ((Ucty[Aktual].maDebet()) ? "ano" : "ne"));
						Tiskni("");
						Tiskni("    Vklady:");
						Ucty[Aktual].vypisVklady();
						Tiskni("");
						Tiskni("    Vybery:");
						Ucty[Aktual].vypisVybery();
						Tiskni("-------------------------------------------------------------");
						Tiskni("");
					}
					break;
				case '?': Help(); break;
				case '.': break;
				default:
					index = -1;
					for(int i=0; i<100; i++) {
						if (Ucty[i]!=null && Ucty[i].jmeno.equals(Command)) {
							index = i;
							break;
						}
					}
					if (index >= 0) {
						Aktual = index;
						Tiskni("Vybrali jste ucet " + Command + ".");
					} else {
						Tiskni("CHYBA: Ucet " + Command + " neexistuje.");
					}
					break;
			}
			if (Action == '.') break;
		}
		Tiskni("Bye, bye...");
		Tiskni("");
		Tiskni("-------------------------------------------------------------");
		Tiskni("Program UCTY\tMartin Sloup, FAV INI-B, A04372");
		Tiskni("");
		Tiskni("Tato demoverze umi pracovat s maximalne 100 uctama.");
		Tiskni("-------------------------------------------------------------");
	}
}