public class Console
	{
	public static void printPrompt(String prompt)
		{
		System.out.print(prompt + " ");
		System.out.flush();
		}

	public static String readString()
        {
        int ch;
        String r="";
        boolean done=false;
        while (!done)
        	{
            try
            	{
                ch=System.in.read();
                if (ch < 0 || (char)ch == '\n')
                	done=true;
                else
                	if ((char)ch != '\r')
                    	r=r + (char) ch;
                }
            catch(java.io.IOException e)
            	{
                done=true;
                }
		}
	return r;
    }

    public static String readString(String prompt)
    	{
        printPrompt(prompt);
        return readString();
        }

	public static char readChar()
    	{
        while (true)
        	{
            try
            	{
                return readString().charAt(0);
                }
            catch(Exception e)
                {
                System.out.println("No es un caracter. Pruebe otra vez!");
                }
            }
        }

	public static char readChar(String prompt)
        {
        printPrompt(prompt);
        return readChar();
        }

    public static int readInt()
        {
        while(true)
        	{
            try
            	{
                return Integer.valueOf(readString().trim()).intValue();
                }
            catch(NumberFormatException e)
            	{
                System.out.println("No es un entero. Pruebe otra vez!");
                }
           	}
		}

	public static int readInt(String prompt)
        {
        printPrompt(prompt);
        return readInt();
        }

    public static double readDouble()
        {
        while(true)
        	{
            try
            	{
                return Double.valueOf(readString().trim()).doubleValue();
                }
            catch(NumberFormatException e)
            	{
                System.out.println("No es un double. Pruebe otra vez!");
                }
            }
        }

	public static double readDouble(String prompt)
    	{
        printPrompt(prompt);
        return readDouble();
        }

	public static float readFloat()
		{
		while(true)
			{
			try
				{
				return Float.valueOf(readString().trim()).floatValue();
				}
			catch(NumberFormatException e)
				{
				System.out.println("No es un float. Pruebe otra vez!");
				}
			}
		}

	public static float readFloat(String prompt)
		{
		printPrompt(prompt);
		return readFloat();
		}
}