public class Harmonic {
public static void main(String[] args) {
// command-line argument
int N = Integer.parseInt(args[0]);
// compute 1/1 + 1/2 + 1/3 + ... + 1/N
double sum = 0.0;
for (int i = 1; i <= N; i++) {
sum += 1.0 / i;
}
// print out Nth harmonic number
System.out.println(sum);
}
}
/*************************************************************************
* Execution: java Harmonic N
*
* Prints the Nth harmonic number: 1/1 + 1/2 + ... + 1/N.
*
* % java Harmonic 10
* 2.9289682539682538
*
* % java Harmonic 10000
* 9.787606036044348
*
*************************************************************************/
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