play that tune
DESCRIPTION
java codeTRANSCRIPT
7/17/2019 Play That Tune
http://slidepdf.com/reader/full/play-that-tune 1/2
9/18/2015 PlayThatTune.java
http://introcs.cs.princeton.edu/java/15inout/PlayThatTune.java.html 1/2
PlayThatTune.java
Below is the syntax highlighted version of PlayThatTune.java from §1.5 Input and Output.
/****************************************************************************** * Compilation: javac PlayThatTune.java * Execution: java PlayThatTune < input.txt * Dependencies: StdAudio.java StdAudio.java * * This is a data‐driven program that plays pure tones from * the notes on the chromatic scale, specified on standard input * by their distance from concert A. * * % java PlayThatTune < elise.txt * *
* Data files * ‐‐‐‐‐‐‐‐‐‐ * http://www.cs.princeton.edu/introcs/21function/elise.txt * http://www.cs.princeton.edu/introcs/21function/freebird.txt * http://www.cs.princeton.edu/introcs/21function/Ascale.txt * http://www.cs.princeton.edu/introcs/21function/National_Anthem.txt * http://www.cs.princeton.edu/introcs/21function/looney.txt * http://www.cs.princeton.edu/introcs/21function/StairwayToHeaven.txt * http://www.cs.princeton.edu/introcs/21function/entertainer.txt * http://www.cs.princeton.edu/introcs/21function/old‐nassau.txt * http://www.cs.princeton.edu/introcs/21function/arabesque.txt * http://www.cs.princeton.edu/introcs/21function/firstcut.txt
* http://www.cs.princeton.edu/introcs/21function/tomsdiner.txt * ******************************************************************************/
public class PlayThatTune {
public static void main(String[] args) {
// repeat as long as there are more integers to read in while (!StdIn.isEmpty()) {
// read in the pitch, where 0 = Concert A (A4) int pitch = StdIn.readInt();
// read in duration in seconds double duration = StdIn.readDouble();
// build sine wave with desired frequency double hz = 440 * Math.pow(2, pitch / 12.0); int N = (int) (StdAudio.SAMPLE_RATE * duration); double[] a = new double[N+1]; for (int i = 0; i <= N; i++) { a[i] = Math.sin(2 * Math.PI * i * hz / StdAudio.SAMPLE_RATE); }
// play it using standard audio StdAudio.play(a); } }}