第三章第十三题（金融应用：计算税款）(Financial application: compute taxes)

*3.13（金融应用：计算税款）程序清单3-5给出了计算单身登记人税款的源代码。将程序清单3-5补充完整，从而计算所有登记的婚姻状态的税款。 *3.13(Financial application: compute taxes) Listing 3.5, ComputeTax.java, gives the source code to compute taxes for single filers. Complete this program to compute taxes for all filing statuses.参考代码： package chapter03; import java.util.Scanner; public class Code_13 { public static void main(String[] args) { Scanner input = new Scanner(System.in); // Prompt the user to enter filing status System.out.print("(0-single filer, 1-married jointly or " + "qualifying widow(er), 2-married separately, 3-head of " + "household) Enter the filing status: "); int status = input.nextInt(); // Prompt the user to enter taxable income System.out.print("Enter the taxable income: "); double income = input.nextDouble(); // Compute tax double tax = 0; if (status == 0) { // Compute tax for single filers if (income <= 8350) tax = income * 0.10; else if (income <= 33950) tax = 8350 * 0.10 + (income - 8350) * 0.15; else if (income <= 82250) tax = 8350 * 0.10 + (33950 - 8350) * 0.15 +(income - 33950) * 0.25; else if (income <= 171550) tax = 8350 * 0.10 + (33950 - 8350) * 0.15 +(82250 - 33950) * 0.25 + (income - 82250) * 0.28; else if (income <= 372950) tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (82250 - 33950) * 0.25 + (171550 - 82250) * 0.28 + (income - 171550) * 0.33; else tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (82250 - 33950) * 0.25 + (171550 - 82250) * 0.28 + (372950 - 171550) * 0.33 + (income - 372950) * 0.35; } else if (status == 1) {// Compute tax for married file jointly or qualifying widow(er) if (income <= 16700) tax = income * 0.10; else if (income <= 67900) tax = 16700 * 0.10 + (income - 16700) * 0.15; else if (income <= 137050) tax = 16700 * 0.10 + (67900 - 16700) * 0.15 +(income - 67900) * 0.25; else if (income <= 208850) tax = 16700 * 0.10 + (67900 - 16700) * 0.15 +(137050 - 67900) * 0.25 + (income - 137050) * 0.28; else if (income <= 372950) tax = 16700 * 0.10 + (67900 - 16700) * 0.15 + (137050 - 67900) * 0.25 + (208850 - 137050) * 0.28 + (income - 208850) * 0.33; else tax = 16700 * 0.10 + (67900 - 16700) * 0.15 + (137050 - 67900) * 0.25 + (208850 - 137050) * 0.28 + (372950 - 208850) * 0.33 + (income - 372950) * 0.35; } else if (status == 2) { // Compute tax for married separately if (income <= 8350) tax = income * 0.10; else if (income <= 33950) tax = 8350 * 0.10 + (income - 8350) * 0.15; else if (income <= 68525) tax = 8350 * 0.10 + (33950 - 8350) * 0.15 +(income - 33950) * 0.25; else if (income <= 104425) tax = 8350 * 0.10 + (33950 - 8350) * 0.15 +(68525 - 33950) * 0.25 + (income - 68525) * 0.28; else if (income <= 186475) tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (68525 - 33950) * 0.25 + (104425 - 68525) * 0.28 + (income - 104425) * 0.33; else tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (68525 - 33950) * 0.25 + (104425 - 68525) * 0.28 + (186475 - 104425) * 0.33 + (income - 186475) * 0.35; } else if (status == 3) { // Compute tax for head of household if (income <= 11950) tax = income * 0.10; else if (income <= 45500) tax = 11950 * 0.10 + (income - 11950) * 0.15; else if (income <= 117450) tax = 11950 * 0.10 + (45500 - 11950) * 0.15 +(income - 45500) * 0.25; else if (income <= 190200) tax = 11950 * 0.10 + (45500 - 11950) * 0.15 +(117450 - 45500) * 0.25 + (income - 117450) * 0.28; else if (income <= 372950) tax = 11950 * 0.10 + (45500 - 11950) * 0.15 + (117450 - 45500) * 0.25 + (190200 - 117450) * 0.28 + (income - 190200) * 0.33; else tax = 11950 * 0.10 + (45500 - 11950) * 0.15 + (117450 - 45500) * 0.25 + (190200 - 117450) * 0.28 + (372950 - 190200) * 0.33 + (income - 372950) * 0.35; } else { System.out.println("Error: invalid status"); System.exit(1); } // Display the result System.out.println("Tax is " + (int)(tax * 100) / 100.0); input.close(); } } 结果显示： (0-single filer, 1-married jointly or qualifying widow(er), 2-married separately, 3-head of household) Enter the filing status: 0 Enter the taxable income: 10000 Tax is 1082.5 Process finished with exit code 0