mport java.text.DecimalFormat; import java.util.Scanner; public class fulijisuanqi02 { static Scanner scanner = new Scanner(System.in); static DecimalFormat df = new DecimalFormat("####0.0000"); public static void main(String[] args) { //TODO Auto-generated method stub System.out.println("1.复利计算;"); System.out.println("2.单利计算;"); System.out.println("3.本金计算;"); System.out.println("4.年限计算。"); System.out.println("5.报酬率计算:"); System.out.println("6.累计资产总值计算:"); System.out.println("请选择:"); int k = scanner.nextInt(); switch (k) { case 1: fulijisuan(); break; case 2: danlijisuan(); break; case 3: benjinjisuan(); break; case 4: nianxianjisuan(); break; case 5: baochoulvjisuan(); break; case 6: leijizichanjisuan(); break; default: break; } } private static void leijizichanjisuan() { // TODO Auto-generated method stub System.out.println("请输入本金:"); double P = scanner.nextDouble(); System.out.println("请输入每年的投资金额:"); double T = scanner.nextDouble(); System.out.println("请输入投资年限:"); int n = scanner.nextInt(); System.out.println("请输入投资利率:"); double i = scanner.nextDouble(); for(int j = 0;j < n;j++){ P = P * (1 + i); P = P + T; } double F = P - T;
String f = df.format(F); System.out.println("资产总值是:"+f); } private static void baochoulvjisuan() { // TODO Auto-generated method stub System.out.println("请输入本金:"); double P = scanner.nextDouble(); System.out.println("请输入复利终值:"); double F = scanner.nextDouble(); System.out.println("请输入年限:"); int n = scanner.nextInt(); double i = Math.pow((F / P), (1.0 / n)) - 1;
String f = df.format(i); System.out.println("利率是:"+f); } private static void nianxianjisuan() { //TODO Auto-generated method stub System.out.println("请输入本金:"); double P = scanner.nextDouble(); System.out.println("请输入利率:"); double i = scanner.nextDouble(); System.out.println("请输入复利终值:"); double F = scanner.nextDouble(); int n = (int) (Math.log(F / P) / Math.log(1 + i)); System.out.println("年限是:" + n); } private static void benjinjisuan() { //TODO Auto-generated method stub System.out.println("请输入复利终值:"); double F = scanner.nextDouble(); System.out.println("请输入利率:"); double i = scanner.nextDouble(); System.out.println("请输入年限:"); int n = scanner.nextInt(); double P; P = F / Math.pow(1 + i, n); String p = df.format(P); System.out.println("本金是:" + p); } private static void danlijisuan() { //TODO Auto-generated method stub System.out.println("请输入本金:"); double P = scanner.nextDouble(); System.out.println("请输入利率:"); double i = scanner.nextDouble(); System.out.println("请输入年限:"); int n = scanner.nextInt(); double F; F = P * (1 + i * n); String f = df.format(F); System.out.println("单利终值是:" + f); } private static void fulijisuan() { System.out.println("请输入本金:"); double P = scanner.nextDouble(); System.out.println("请输入利率:"); double i = scanner.nextDouble(); System.out.println("请输入年限:"); int n = scanner.nextInt(); double F; F = P * Math.pow(1 + i, n); String f = df.format(F); System.out.println("复利终值是:" + f); } }
该程序我使用的是java语言来进行编译的,代码行数大概有150行左右,工作量大概用了一个小时。
本次改进预计应该可以在20分钟内完成,代码行数大概需要20-30行。
本次的修改主要增加了两个功能,一个是计算报酬率,另一个是计算在投资的同时每年再投入一定的金额,这两个的难点主要在于计算的过程,这也是这个程序的难点所在,还有不足的地方就是没有做出界面。
本次的工作量也超过了预期,主要原因在于计算方面花了比较大的时间,其他地方都是和之前的一样,主要就是计算的方法不同。