编程珠玑-课后练习题3

计算税率表达式简化

package third;

public class SimpleTax {
    public static double getTax(double income) {
        double index = (income - 2200) / 500;
        double tax = 0;
        double startRate = 0.14;
        if (index <= 0) {
            tax = 0;
        } else {
            for (int i = 1; i <= index; i++) {
                tax = tax + startRate * 500;
                startRate += 0.01;
            }
            tax += (income - 2200 - 500 * ((int) index)) * startRate;
        }
        return tax;
    }

    public static void main(String[] args) {
        System.out.println(getTax(3700));
    }

}