循环这一章的综合题答案。
5.21财务应用程序：比较不同利率下的贷款
自己注意下输出的格式，自己调整就好了的。
package nameyu;
import java.util.Scanner;
public class Test {
/** * @param args */
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
System.out.print("Loan Amount:");
int loan=input.nextInt();
System.out.print("Number of years:");
int years=input.nextInt();
System.out.printf("%-5s%-5s%-5s%n","Interest Rate","Monthly Payment","Total Payment");
for(double annualInterestRate=5.0;annualInterestRate<=8.0;annualInterestRate=annualInterestRate+0.125){
double MonthlyPayment=loan*(annualInterestRate/1200)/(1-1/Math.pow(1+annualInterestRate/1200, years*12));
double TotalPayment=MonthlyPayment*years*12;
System.out.printf("%-5.3f%s%s%5.2f%s%-5.2f%n",annualInterestRate,"%"," ",MonthlyPayment," ",TotalPayment);
}
}5.22财务应用程序：显示分期还贷时间表
package nameyu;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.print("Loan Amount:");
double loan=input.nextDouble();
System.out.print("Numeber of years:");
int years =input.nextInt();
System.out.print("Annual Interest Rate:");
double InterestRate=input.nextDouble();
double MonthlyPayment=loan*(InterestRate/1200)/(1-1/Math.pow(1+InterestRate/1200, years*12));
double TotalPayment=MonthlyPayment*years*12;
System.out.printf("%-4.2f%s%-4.2f%n",MonthlyPayment," ",TotalPayment);
System.out.println();
System.out.println("Payment#"+"\t"+"Interest"+"\t\t\t"+"Principal"+"\t\t\t"+"Balance");
double balance=loan;
for(int i=1;i<=years*12;i++){
double Interest=(InterestRate/1200)*balance;
double principal=MonthlyPayment-Interest;
balance=balance-principal;
System.out.println(i+"\t\t"+Interest+"\t\t"+principal+"\t\t"+balance);
}
}
}
5.23示例抵消错误
从左到右
Enter a number such as 5000:5000
9.094508852984404
package nameyu;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.print("Enter a number such as 5000:");
int n=input.nextInt();
double sum=0;
for(int i=1;i<=n;i++){
sum+=(1.0)/i;
}
System.out.println(sum);
}
}
从右到左
Enter a number such as 5000:5000
9.09450885298443
package nameyu;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.print("Enter a number such as 5000:");
int n=input.nextInt();
double sum=0;
for(int i=n;i>0;i--){
sum+=(1.0)/i;
}
System.out.println(sum);
}
}
5.24数列求和
package nameyu;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
double sum=0;
for(int i=1;(2*i-1)<=97;i++){
double a=((2*i)*1.0-1)/(1+2*i);
sum+=a;
// System.out.println(a);
}
System.out.println(sum);
}
}
5.25计算π值
π=3.141592653589793238462643383279502 我也只能大概记住这么多位。输入10000 -100000 自己输出看看就行。
package nameyu;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.print("Enter a number:");
int n=input.nextInt();
double sum=0;
for(int i=1;i<=n;i++){
sum+=(double)(Math.pow((-1),(i+1))/(2*i-1));
}
System.out.println((double)(4*sum));
}
}
/* Enter a number:10000 3.1414926535900345 Enter a number:20000 3.1415426535898248 Enter a number:30000 3.141559320256462 */
5.26计算e
1：用Scanner
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.print("Enter a number:");
int number=input.nextInt();
double e = 1.0;
double item = 1.0;
for (int i = 1; i <= number; i++) {
item = item / i;
e = e+item;
}
System.out.println("The e is " + e + " for i = " + number);
}
}
2：用if
package nameyu;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
double e = 1.0;
double item = 1.0;
for (int i = 1; i <= 100000; i++) {
item = item / i;
e = e+item;
if (i == 10000 || i == 20000 || i == 30000 || i == 40000 || i == 50000 || i == 60000 || i == 70000 || i == 80000 ||i == 90000 || i == 100000){
System.out.println("The e is " + e + " for i = " + i);
}
}
}
}
5.27显示闰年
首先显示从101-2100期间所有的闰年，然后输出时，每行十个。中间用一个空格字符隔开，所以不能斜杠T了。虽然那个好用。
兄弟们，我坚强的使用了\t，在下强迫症，那个当数字是四位数的时候不整齐。
package nameyu;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
int count=0;
for(int years=101;years<=2100;years++){
if((years%4==0&&years%100!=0)||(years%400==0)){
count++;
if(count%10==0){
System.out.println(years);
}else
System.out.print(years+"\t");
}
}
}
}
5.28显示每月第一天是星期几
看清楚这道题的代码，可能和你们百度的方法都不一样。我的答案并没有错哦~
package nameyu;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.print("Enter a year :");
int year=input.nextInt();
System.out.print("Enter the first day of the year is a few weeks :");
int week=input.nextInt();
String M=null;
int mouth;
int W;
boolean LeapYear=(year%4==0&&year%100!=0)||(year%400==0);
for(mouth=1;mouth<=12;mouth++){
if(mouth==1){
M="January";
}else if(mouth==2){
W=(31%7+week)%7;
week=W;
M="February";
}else if(mouth==3){
if(LeapYear){
W=(29%7+week)%7;
week=W;
M="March";
}else
{W=(28%7+week)%7;
week=W;}
M="March";
}else if(mouth==4){
W=(31%7+week)%7;
week=W;
M="April";
}else if(mouth==5){
W=(30%7+week)%7;
week=W;
M="May";
}else if(mouth==6){
W=(31%7+week)%7;
week=W;
M="June";
}else if(mouth==7){
W=(30%7+week)%7;
week=W;
M="July";
}else if(mouth==8){
W=(31%7+week)%7;
week=W;
M="August";
}else if(mouth==9){
W=(31%7+week)%7;
week=W;
M="September";
}else if(mouth==10){
W=(30%7+week)%7;
week=W;
M="October";
}else if(mouth==11){
W=(31%7+week)%7;
week=W;
M="November";
}else if(mouth==12){
W=(30%7+week)%7;
week=W;
M="December";
}
switch(week){
case 1: System.out.println(M+" "+mouth+" "+year+" is Monday");break;
case 2: System.out.println(M+" "+mouth+" "+year+" is Tuesday");break;
case 3: System.out.println(M+" "+mouth+" "+year+" is Wednesday");break;
case 4: System.out.println(M+" "+mouth+" "+year+" is Thursday");break;
case 5: System.out.println(M+" "+mouth+" "+year+" is Friday");break;
case 6: System.out.println(M+" "+mouth+" "+year+" is Saturday");break;
case 0: System.out.println(M+" "+mouth+" "+year+" is Sunday");break;
}
}
}
} 5.29显示日历
通过上一题改的，主要看if中间的代码，看一个就懂了。每个月里面的代码是差不多的，就是时间不同，31天30天，28，29的区别。
package nameyu;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.print("Enter a year :");
int year=input.nextInt();
System.out.print("Enter the first day of the year is a few weeks :");
int week=input.nextInt();
String M=null;
int mouth;
int W;
int count=0;
boolean LeapYear=(year%4==0&&year%100!=0)||(year%400==0);
for(mouth=1;mouth<=12;mouth++){
if(mouth==1){
M="January";
System.out.println("\t\t "+M+"\t"+year);
System.out.println("----------------------------------------------------");
System.out.println("Sun"+"\t"+"Mon"+"\t"+"Tue"+"\t"+"Wed"+"\t"+"Thu"+"\t"+"Fri"+"\t"+"Sat");
for(int j=0;j<week;j++){
System.out.print("\t");
}
for(int i=1;i<=7-week;i++){
if(i%7==0){
System.out.println(i);
}else
System.out.print(i+"\t");
}
System.out.println();
for(int k=(7-week+1);k<=31;k++){
count++;
if(count%7==0){
System.out.println(k);
}else
System.out.print(k+"\t");
}
System.out.println();
count=0;
}
else if(mouth==2){
W=(31%7+week)%7;
week=W;
M="February";
if(LeapYear){
System.out.println("\t\t "+M+"\t"+year);
System.out.println("----------------------------------------------------");
System.out.println("Sun"+"\t"+"Mon"+"\t"+"Tue"+"\t"+"Wed"+"\t"+"Thu"+"\t"+"Fri"+"\t"+"Sat");
for(int j=0;j<week;j++){
System.out.print("\t");
}
for(int i=1;i<=7-week;i++){
if(i%7==0){
System.out.println(i);
}else
System.out.print(i+"\t");
}
System.out.println();
for(int k=(7-week+1);k<=29;k++){
count++;
if(count%7==0){
System.out.println(k);
}else
System.out.print(k+"\t");
}
System.out.println();
count=0;
}else{
System.out.println("\t\t "+M+"\t"+year);
System.out.println("----------------------------------------------------");
System.out.println("Sun"+"\t"+"Mon"+"\t"+"Tue"+"\t"+"Wed"+"\t"+"Thu"+"\t"+"Fri"+"\t"+"Sat");
for(int j=0;j<week;j++){
System.out.print("\t");
}
for(int i=1;i<=7-week;i++){
if(i%7==0){
System.out.println(i);
}else
System.out.print(i+"\t");
}
System.out.println();
for(int k=(7-week+1);k<=28;k++){
count++;
if(count%7==0){
System.out.println(k);
}else
System.out.print(k+"\t");
}
System.out.println();
count=0;
}
}
else if(mouth==3){
if(LeapYear){
W=(29%7+week)%7;
week=W;
M="March";
System.out.println("\t\t "+M+"\t"+year);
System.out.println("----------------------------------------------------");
System.out.println("Sun"+"\t"+"Mon"+"\t"+"Tue"+"\t"+"Wed"+"\t"+"Thu"+"\t"+"Fri"+"\t"+"Sat");
for(int j=0;j<week;j++){
System.out.print("\t");
}
for(int i=1;i<=7-week;i++){
if(i%7==0){
System.out.println(i);
}else
System.out.print(i+"\t");
}
System.out.println();
for(int k=(7-week+1);k<=31;k++){
count++;
if(count%7==0){
System.out.println(k);
}else
System.out.print(k+"\t");
}
System.out.println();
count=0;
}
else{W=(28%7+week)%7;
week=W;
M="March";
System.out.println("\t\t "+M+"\t"+year);
System.out.println("----------------------------------------------------");
System.out.println("Sun"+"\t"+"Mon"+"\t"+"Tue"+"\t"+"Wed"+"\t"+"Thu"+"\t"+"Fri"+"\t"+"Sat");
for(int j=0;j<week;j++){
System.out.print("\t");
}
for(int i=1;i<=7-week;i++){
if(i%7==0){
System.out.println(i);
}else
System.out.print(i+"\t");
}
System.out.println();
for(int k=(7-week+1);k<=31;k++){
count++;
if(count%7==0){
System.out.println(k);
}else
System.out.print(k+"\t");
}
System.out.println();
count=0;
}
}
else if(mouth==4){
W=(31%7+week)%7;
week=W;
M="April";
System.out.println("\t\t "+M+"\t"+year);
System.out.println("----------------------------------------------------");
System.out.println("Sun"+"\t"+"Mon"+"\t"+"Tue"+"\t"+"Wed"+"\t"+"Thu"+"\t"+"Fri"+"\t"+"Sat");
for(int j=0;j<week;j++){
System.out.print("\t");
}
for(int i=1;i<=7-week;i++){
if(i%7==0){
System.out.println(i);
}else
System.out.print(i+"\t");
}
System.out.println();
for(int k=(7-week+1);k<=30;k++){
count++;
if(count%7==0){
System.out.println(k);
}else
System.out.print(k+"\t");
}
System.out.println();
count=0;
}else if(mouth==5){
W=(30%7+week)%7;
week=W;
M="May";
System.out.println("\t\t "+M+"\t"+year);
System.out.println("----------------------------------------------------");
System.out.println("Sun"+"\t"+"Mon"+"\t"+"Tue"+"\t"+"Wed"+"\t"+"Thu"+"\t"+"Fri"+"\t"+"Sat");
for(int j=0;j<week;j++){
System.out.print("\t");
}
for(int i=1;i<=7-week;i++){
if(i%7==0){
System.out.println(i);
}else
System.out.print(i+"\t");
}
System.out.println();
for(int k=(7-week+1);k<=31;k++){
count++;
if(count%7==0){
System.out.println(k);
}else
System.out.print(k+"\t");
}
System.out.println();
count=0;
}else if(mouth==6){
W=(31%7+week)%7;
week=W;
M="June";
System.out.println("\t\t "+M+"\t"+year);
System.out.println("----------------------------------------------------");
System.out.println("Sun"+"\t"+"Mon"+"\t"+"Tue"+"\t"+"Wed"+"\t"+"Thu"+"\t"+"Fri"+"\t"+"Sat");
for(int j=0;j<week;j++){
System.out.print("\t");
}
for(int i=1;i<=7-week;i++){
if(i%7==0){
System.out.println(i);
}else
System.out.print(i+"\t");
}
System.out.println();
for(int k=(7-week+1);k<=30;k++){
count++;
if(count%7==0){
System.out.println(k);
}else
System.out.print(k+"\t");
}
System.out.println();
count=0;
}else if(mouth==7){
W=(30%7+week)%7;
week=W;
M="July";
System.out.println("\t\t "+M+"\t"+year);
System.out.println("----------------------------------------------------");
System.out.println("Sun"+"\t"+"Mon"+"\t"+"Tue"+"\t"+"Wed"+"\t"+"Thu"+"\t"+"Fri"+"\t"+"Sat");
for(int j=0;j<week;j++){
System.out.print("\t");
}
for(int i=1;i<=7-week;i++){
if(i%7==0){
System.out.println(i);
}else
System.out.print(i+"\t");
}
System.out.println();
for(int k=(7-week+1);k<=31;k++){
count++;
if(count%7==0){
System.out.println(k);
}else
System.out.print(k+"\t");
}
System.out.println();
count=0;
}else if(mouth==8){
W=(31%7+week)%7;
week=W;
M="August";
System.out.println("\t\t "+M+"\t"+year);
System.out.println("----------------------------------------------------");
System.out.println("Sun"+"\t"+"Mon"+"\t"+"Tue"+"\t"+"Wed"+"\t"+"Thu"+"\t"+"Fri"+"\t"+"Sat");
for(int j=0;j<week;j++){
System.out.print("\t");
}
for(int i=1;i<=7-week;i++){
if(i%7==0){
System.out.println(i);
}else
System.out.print(i+"\t");
}
System.out.println();
for(int k=(7-week+1);k<=31;k++){
count++;
if(count%7==0){
System.out.println(k);
}else
System.out.print(k+"\t");
}
System.out.println();
count=0;
}else if(mouth==9){
W=(31%7+week)%7;
week=W;
M="September";
System.out.println("\t\t "+M+"\t"+year);
System.out.println("----------------------------------------------------");
System.out.println("Sun"+"\t"+"Mon"+"\t"+"Tue"+"\t"+"Wed"+"\t"+"Thu"+"\t"+"Fri"+"\t"+"Sat");
for(int j=0;j<week;j++){
System.out.print("\t");
}
for(int i=1;i<=7-week;i++){
if(i%7==0){
System.out.println(i);
}else
System.out.print(i+"\t");
}
System.out.println();
for(int k=(7-week+1);k<=30;k++){
count++;
if(count%7==0){
System.out.println(k);
}else
System.out.print(k+"\t");
}
System.out.println();
count=0;
}else if(mouth==10){
W=(30%7+week)%7;
week=W;
M="October";
System.out.println("\t\t "+M+"\t"+year);
System.out.println("----------------------------------------------------");
System.out.println("Sun"+"\t"+"Mon"+"\t"+"Tue"+"\t"+"Wed"+"\t"+"Thu"+"\t"+"Fri"+"\t"+"Sat");
for(int j=0;j<week;j++){
System.out.print("\t");
}
for(int i=1;i<=7-week;i++){
if(i%7==0){
System.out.println(i);
}else
System.out.print(i+"\t");
}
System.out.println();
for(int k=(7-week+1);k<=31;k++){
count++;
if(count%7==0){
System.out.println(k);
}else
System.out.print(k+"\t");
}
System.out.println();
count=0;
}else if(mouth==11){
W=(31%7+week)%7;
week=W;
M="November";
System.out.println("\t\t "+M+"\t"+year);
System.out.println("----------------------------------------------------");
System.out.println("Sun"+"\t"+"Mon"+"\t"+"Tue"+"\t"+"Wed"+"\t"+"Thu"+"\t"+"Fri"+"\t"+"Sat");
for(int j=0;j<week;j++){
System.out.print("\t");
}
for(int i=1;i<=7-week;i++){
if(i%7==0){
System.out.println(i);
}else
System.out.print(i+"\t");
}
System.out.println();
for(int k=(7-week+1);k<=30;k++){
count++;
if(count%7==0){
System.out.println(k);
}else
System.out.print(k+"\t");
}
System.out.println();
count=0;
}else if(mouth==12){
W=(30%7+week)%7;
week=W;
M="December";
System.out.println("\t\t "+M+"\t"+year);
System.out.println("----------------------------------------------------");
System.out.println("Sun"+"\t"+"Mon"+"\t"+"Tue"+"\t"+"Wed"+"\t"+"Thu"+"\t"+"Fri"+"\t"+"Sat");
for(int j=0;j<week;j++){
System.out.print("\t");
}
for(int i=1;i<=7-week;i++){
if(i%7==0){
System.out.println(i);
}else
System.out.print(i+"\t");
}
System.out.println();
for(int k=(7-week+1);k<=31;k++){
count++;
if(count%7==0){
System.out.println(k);
}else
System.out.print(k+"\t");
}
System.out.println();count=0;
}
}
}
}
5.30财务应用程序：复利值
package nameyu;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.print("Enter the amount of savings :");
double dollar=input.nextDouble();
System.out.print("Enter annual rate:");
double annualrate=input.nextDouble();
System.out.print("Number of months :");
int mouth=input.nextInt();
double sum=0;
double MonthlyInterestRate=annualrate/1200;
for(int i=1;i<=mouth;i++){
sum=(sum+dollar)*(1+MonthlyInterestRate);
}
System.out.println(sum);
}
}
5.31财务应用程序：计算CD价值
package nameyu;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.print("Enter the initial deposit amount :");
double dollar=input.nextDouble();
System.out.print("Enter annual percentage yield :");
double annualrate=input.nextDouble();
System.out.print("Enter maturity period (number of mounths) :");
int mouth=input.nextInt();
double sum=0;
double MonthlyInterestRate=annualrate/1200;
System.out.println("Month"+"\t"+"CD Value");
for(int i=1;i<=mouth;i++){
sum=dollar*(1+MonthlyInterestRate);
dollar=sum;
System.out.println(i+"\t"+sum);
}
}
} 5.32游戏：彩票
package nameyu;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
int lottery1=(int) (Math.random()*10);
int lottery2=(int) (Math.random()*10);
int Lottery=lottery1*10+lottery2;
if(lottery2==lottery1){
int lottery3=(int) (Math.random()*10);
lottery2 =lottery3;
}
Scanner input=new Scanner (System.in);
System.out.print("Enter your lottery pick(two digits):");
int guess=input.nextInt();
int guessDigit1=guess/10;
int guessDigit2=guess%10;
System.out.println("The lottery number is "+Lottery);
if(guess==Lottery)
System.out.println("Exact match:you win $10000");
else if(guessDigit2==lottery1&&guessDigit1==lottery2)
System.out.println("Match one digit:you win $3000");
else if(guessDigit1==lottery1||guessDigit1==lottery2||guessDigit2==lottery1||guessDigit2==lottery2)
System.out.println("Match one digit:you win $1000");
else
System.out.println("sorry,no match");
}
}
如有其它题目需要的话，在评论里留下题号，博主看到会尽快解决。