Come up with a recursive definition and use it to guide you to write a method definition for a double -valued method named harmonic that accepts an int parameters n and recursively calculates and returns the nth harmonic number.

LANGUAGE: Java

CHALLENGE:

The nth harmonic number is defined non-recursively as: 1 +1/2 + 1/3 + 1/4 + … + 1/n.
Come up with a recursive definition and use it to guide you to write a method definition for a double -valued method named harmonic that accepts an int parameters n and recursively calculates and returns the nth harmonic number.

SOLUTION:

public static double harmonic(int n) {
    if(n == 1) {
        return 1.0;
    } else {
        return (1.0 / n) + harmonic(n - 1);
    }
}