edu.princeton.cs.algorithms.RandomSeq Maven / Gradle / Ivy
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package edu.princeton.cs.algorithms;
import edu.princeton.cs.introcs.StdOut;
import edu.princeton.cs.introcs.StdRandom;
/*************************************************************************
* Compilation: javac RandomSeq.java
* Execution: java RandomSeq N lo hi
*
* Prints N numbers between lo and hi.
*
* % java RandomSeq 5 100.0 200.0
* 123.43
* 153.13
* 144.38
* 155.18
* 104.02
*
*************************************************************************/
/**
* The RandomSeq class is a client that prints out a pseudorandom
* sequence of real numbers in a given range.
*
* For additional documentation, see Section 1.1 of
* Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne.
*
* @author Robert Sedgewick
* @author Kevin Wayne
*/
public class RandomSeq {
// this class should not be instantiated
private RandomSeq() { }
/**
* Reads in two command-line arguments lo and hi and prints N uniformly
* random real numbers in [lo, hi) to standard output.
*/
public static void main(String[] args) {
// command-line arguments
int N = Integer.parseInt(args[0]);
// for backward compatibility with Intro to Programming in Java version of RandomSeq
if (args.length == 1) {
// generate and print N numbers between 0.0 and 1.0
for (int i = 0; i < N; i++) {
double x = StdRandom.uniform();
StdOut.println(x);
}
}
else if (args.length == 3) {
double lo = Double.parseDouble(args[1]);
double hi = Double.parseDouble(args[2]);
// generate and print N numbers between lo and hi
for (int i = 0; i < N; i++) {
double x = StdRandom.uniform(lo, hi);
StdOut.printf("%.2f\n", x);
}
}
else {
throw new IllegalArgumentException("Invalid number of arguments");
}
}
}