org.apfloat.samples
Class Pi

java.lang.Object
  org.apfloat.samples.Pi

Direct Known Subclasses:

PiParallel

public class Pi
extends Object

Calculates pi using three different algorithms.

Version:

1.4.2

Author:

Mikko Tommila

Nested Class Summary

static class	Pi.BorweinPiCalculator Calculates pi using the Borweins' quartic algorithm.
static class	Pi.ChudnovskyPiCalculator Basic class for calculating pi using the Chudnovskys' binary splitting algorithm.
static class	Pi.ChudnovskyProgressIndicator Indicates progress of the pi calculation using the Chudnovskys' binary splitting algorithm.
static class	Pi.GaussLegendrePiCalculator Calculates pi using the Gauss-Legendre algorithm.

Field Summary

protected static PrintWriter	err Output stream for status messages printout.
protected static PrintWriter	out Output stream for the result printout.

Method Summary

protected static void	checkAlive() Check whether the program should stop executing.
static PrintWriter	getErr() Get the output stream for status messages printout.
protected static int	getInt(String arg, String name, int minValue, int maxValue) Parse an integer from an argument.
protected static long	getLong(String arg, String name, long minValue, long maxValue) Parse a long from an argument.
static PrintWriter	getOut() Get the output stream for the result printout.
protected static long	getPrecision(String arg) Parse the precision from an argument.
protected static int	getRadix(String arg) Parse the radix from an argument.
static void	main(String[] args) Command-line entry point.
static void	run(long precision, int radix, Operation<Apfloat> operation) Execute an operation and display some additional information.
static void	setAlive(boolean isAlive) Set whether the program should stop executing.
static void	setErr(PrintWriter err) Set the output stream for status messages printout.
static void	setOut(PrintWriter out) Set the output stream for the result printout.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

out

protected static PrintWriter out

Output stream for the result printout.

err

protected static PrintWriter err

Output stream for status messages printout.

Method Detail

getLong

protected static long getLong(String arg,
                              String name,
                              long minValue,
                              long maxValue)

Parse a long from an argument.

Parameters:

arg - The string to be parsed.

name - Description of the argument.

minValue - Minimum allowed value.

maxValue - Maximum allowed value.

Returns:

Valid long.

getInt

protected static int getInt(String arg,
                            String name,
                            int minValue,
                            int maxValue)

Parse an integer from an argument.

Parameters:

arg - The string to be parsed.

name - Description of the argument.

minValue - Minimum allowed value.

maxValue - Maximum allowed value.

Returns:

Valid integer.

getPrecision

protected static long getPrecision(String arg)

Parse the precision from an argument.

Parameters:

arg - The string to be parsed.

Returns:

Valid precision.

getRadix

protected static int getRadix(String arg)

Parse the radix from an argument.

Parameters:

arg - The string to be parsed.

Returns:

Valid radix.

run

public static void run(long precision,
                       int radix,
                       Operation<Apfloat> operation)
                throws IOException,
                       ApfloatRuntimeException

Execute an operation and display some additional information. The return value of the operation is written to out.

Parameters:

precision - The precision to be used.

radix - The radix to be used.

operation - The operation to execute.

Throws:

IOException - In case writing the output fails.

ApfloatRuntimeException

setOut

public static void setOut(PrintWriter out)

Set the output stream for the result printout.

Parameters:

out - The output stream.

getOut

public static PrintWriter getOut()

Get the output stream for the result printout.

Returns:

The output stream.

setErr

public static void setErr(PrintWriter err)

Set the output stream for status messages printout.

Parameters:

err - The output stream.

getErr

public static PrintWriter getErr()

Get the output stream for status messages printout.

Returns:

The output stream.

setAlive

public static void setAlive(boolean isAlive)

Set whether the program should stop executing.

Parameters:

isAlive - true to keep running the program, false to stop.

main

public static void main(String[] args)
                 throws IOException,
                        ApfloatRuntimeException

Command-line entry point.

Parameters:

args - Command-line parameters.

Throws:

IOException - In case writing the output fails.

ApfloatRuntimeException

checkAlive

protected static void checkAlive()

Check whether the program should stop executing.

Throws:

ThreadDeath - in case setAlive(boolean) has been set to false.