61 lines
1.6 KiB
Java
61 lines
1.6 KiB
Java
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import edu.princeton.cs.introcs.StdIn;
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import edu.princeton.cs.introcs.StdOut;
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/*************************************************************************
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* Compilation: javac Average.java
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* Execution: java Average < data.txt
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* Dependencies: StdIn.java StdOut.java
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*
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* Reads in a sequence of real numbers, and computes their average.
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*
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* % java Average
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* 10.0 5.0 6.0
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* 3.0 7.0 32.0
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* <Ctrl-d>
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* Average is 10.5
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* Note <Ctrl-d> signifies the end of file on Unix.
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* On windows use <Ctrl-z>.
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*
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*************************************************************************/
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/**
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* The Average class provides a client for reading in a sequence
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* of real numbers and printing out their average.
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*
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* For additional documentation, see <a href="http://algs4.cs.princeton.edu/11model">Section 1.1</a> of
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* Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne.
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*
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* @author Robert Sedgewick
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* @author Kevin Wayne
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*/
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public class Average {
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// this class should not be instantiated
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private Average() { }
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/**
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* Reads in a sequence of real numbers from standard input and prints
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* out their average to standard output.
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*/
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public static void main(String[] args) {
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int count = 0; // number input values
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double sum = 0.0; // sum of input values
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// read data and compute statistics
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while (!StdIn.isEmpty()) {
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double value = StdIn.readDouble();
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sum += value;
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count++;
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}
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// compute the average
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double average = sum / count;
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// print results
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StdOut.println("Average is " + average);
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}
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}
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