harmonic.java

tutorial solutions for java programing

// Exercise 3.5
public class Harmonic { //saved as "Harmonic.java"
	public static void main(String[] args){
		int numTerms = 50000;
		double sumL2R = 0.0; // sum from left to right
		double sumR2L = 0.0; // sum from right to left
		
		// sum from left to right
		for (int denominator = 1; denominator <= numTerms ; denominator++) {
			sumL2R += ((double)1/denominator);
		}
		System.out.println("The sumL2R is " + sumL2R);
		
		// sum from right to left
		for (int denominator = numTerms; denominator >= 1 ; denominator--) {
			sumR2L += ((double)1/denominator);
		}
		System.out.println("The sumR2L is " + sumR2L);
		
		// find the difference
		double difference; // difference between sumL2R and sumR2L
		difference = sumL2R - sumR2L;
		System.out.println("The difference is " + difference);
	}
}