edu.princeton.cs.algs4

Class StopwatchCPU

java.lang.Object

edu.princeton.cs.algs4.StopwatchCPU

public class StopwatchCPU
extends java.lang.Object

The StopwatchCPU data type is for measuring the CPU time used during a programming task. See Stopwatch for a version that measures wall-clock time (the real time that elapses).

Constructor Summary

Constructors

Constructor and Description
StopwatchCPU() Initializes a new stopwatch.

Method Summary

Modifier and Type	Method and Description
double	elapsedTime() Returns the elapsed CPU time (in seconds) since the stopwatch was created.
static void	main(java.lang.String[] args) Unit tests the StopwatchCPU data type.

Methods inherited from class java.lang.Object

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

Constructor Detail

StopwatchCPU

public StopwatchCPU()

Initializes a new stopwatch.

Method Detail

elapsedTime

public double elapsedTime()

Returns the elapsed CPU time (in seconds) since the stopwatch was created.

Returns:

elapsed CPU time (in seconds) since the stopwatch was created

main

public static void main(java.lang.String[] args)

Unit tests the StopwatchCPU data type. Takes a command-line argument n and computes the sum of the square roots of the first n positive integers, first using Math.sqrt(), then using Math.pow(). It prints to standard output the sum and the amount of time to compute the sum. Note that the discrete sum can be approximated by an integral - the sum should be approximately 2/3 * (n^(3/2) - 1).

Parameters:

args - the command-line arguments