java语言程序设计基础篇（第六版）课后编程练习答案

import javax.swing.JOptionPane; public class Exercise3_10{ public static void main(String[] args){ String statusString = JOptionPane.showInputDialog("Enter the filing status:\n"+ "(0-single filter, 1-married jointly,\n"+ "2-married separately, 3-head of household)"); int status = Integer.parseInt(statusString); String incomeString = JOptionPane.showInputDialog("Enter the taxable income:"); double income = Double.parseDouble(incomeString); double tax = 0; if(status == 0){ if(income <= 6000) tax = income*0.10; else if(income <= 27950) tax = 6000*0.10 + (income - 6000)*0.15; else if(income <=67700) tax = 6000*0.10 + (27950 - 6000)*0.15 + (income - 27950)*0.27; else if(income <=141250) tax = 6000*0.10 + (27950 - 6000)*0.15 + (67700 - 27950)*0.27 + (income - 67700)*0.30; else if(income <=307050) tax = 6000*0.10 + (27950 - 6000)*0.15 + (67700 - 27950)*0.27 + (141250 - 67700)*0.30 + (income - 141250)*0.35; else tax = 6000*0.10 + (27950 - 6000)*0.15 + (67700 - 27950)*0.27 + (141250 - 67700)*0.30 + (307050 - 141250)*0.35 + (income - 307050)*0.386; } else if(status == 1){ if(income <= 12000) tax = income*0.10; else if(income <= 46700) tax = 12000*0.10 + (income - 12000)*0.15; else if(income <=112850) tax = 12000*0.10 + (46700 - 12000)*0.15 + (income - 46700)*0.27; else if(income <=171950) tax = 12000*0.10 + (46700 - 12000)*0.15 + (112850 - 46700)*0.27 + (income - 112850)*0.30; else if(income <=307050) tax = 12000*0.10 + (46700 - 12000)*0.15 + (112850 - 46700)*0.27 + (171950 - 112850)*0.30 + (income - 171950)*0.35; else tax = 12000*0.10 + (46700 - 12000)*0.15 + (112850 - 46700)*0.27 + (141250 - 67700)*0.30 + (307050 - 171950)*0.35 + (income - 307050)*0.386; } else if(status == 2){ if(income <= 6000) tax = income*0.10; else if(income <= 27950) tax = 6000*0.10 + (income - 6000)*0.15; else if(income <=67700) tax = 6000*0.10 + (27950 - 6000)*0.15 + (income - 27950)*0.27; else if(income <=141250) tax = 6000*0.10 + (27950 - 6000)*0.15 + (67700 - 27950)*0.27 + (income - 67700)*0.30; else if(income <=307050) tax = 6000*0.10 + (27950 - 6000)*0.15 + (67700 - 27950)*0.27 + (141250 - 67700)*0.30 + (income - 141250)*0.35; else tax = 6000*0.10 + (27950 - 6000)*0.15 + (67700 - 27950)*0.27 + (141250 - 67700)*0.30 + (307050 - 141250)*0.35 + (income - 307050)*0.386; } else if(status == 3){ if(income <= 6000) tax = income*0.10; else if(income <= 27950) tax = 6000*0.10 + (income - 6000)*0.15; else if(income <=67700) tax = 6000*0.10 + (27950 - 6000)*0.15 + (income - 27950)*0.27; else if(income <=141250) tax = 6000*0.10 + (27950 - 6000)*0.15 + (67700 - 27950)*0.27 + (income - 67700)*0.30; else if(income <=307050) tax = 6000*0.10 + (27950 - 6000)*0.15 + (67700 - 27950)*0.27 + (141250 - 67700)*0.30 + (income - 141250)*0.35; else tax = 6000*0.10 + (27950 - 6000)*0.15 + (67700 - 27950)*0.27 + (141250 - 67700)*0.30 + (307050 - 141250)*0.35 + (income - 307050)*0.386; }else{ System.out.println("Error: invalid status"); System.exit(0); } JOptionPane.showMessageDialog(null,"Tax is " + (int)(tax * 100) / 100.0); } }