jtulach@321: package org.apidesign.math;
jtulach@17: 
jtulach@20: /** Class to simplify arithmetical operations, improved version to compute
jtulach@20:  * the sum for ranges.
jtulach@17:  *
jtulach@17:  * @author Jaroslav Tulach <jtulach@netbeans.org>
jtulach@20:  * @version 2.0
jtulach@17:  */
jtulach@17: public class Arithmetica {
jtulach@17:     public int sumTwo(int one, int second) {
jtulach@17:         return one + second;
jtulach@17:     }
jtulach@17:     
jtulach@17:     public int sumAll(int... numbers) {
jtulach@187:         if (numbers.length == 0) {
jtulach@187:             return 0;
jtulach@187:         }
jtulach@17:         int sum = numbers[0];
jtulach@17:         for (int i = 1; i < numbers.length; i++) {
jtulach@17:             sum = sumTwo(sum, numbers[i]);
jtulach@17:         }
jtulach@17:         return sum;
jtulach@17:     }
jtulach@17:     
jtulach@23: // BEGIN: design.composition.arith2.0
jtulach@17:     public int sumRange(int from, int to) {
jtulach@210:         return (from + to) * (Math.abs(to - from) + 1) / 2;
jtulach@17:     }
jtulach@23: // END: design.composition.arith2.0
jtulach@17: }