Java语言程序设计(基础篇)(原书第10版) 第二章编程练习题
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2024-03-02 13:39:52
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Java语言程序设计(基础篇)(原书第10版) 第二章编程练习题
目录
- Java语言程序设计(基础篇)(原书第10版) 第二章编程练习题
- 2-1 将摄氏温度转换为华氏温度
- 2-2 计算圆柱体的体积
- 2-3 将英尺转换为米
- 2-4 将磅转换为千克
- 2-5 财务应用程序:计算小费
- 2-6 求一个整数各位数的和
- 2-7 求出年数
- 2-8 当前时间
- 2-9 物理:加速度
- 2-10 科学:计算能量
- 2-11 人口统计
- 2-12 物理:求出跑到长度
- 2-13 财务应用程序:复利值
- 2-14 医疗应用程序:计算BMI
- 2-15 几何:两点间距离
- 2-16 几何:六边形面积
- 2-17 科学:风寒温度
- 2-18 打印表格
- 2-19 几何:三角形的面积
- 2-20 财务应用程序:计算利息
- 2-21 财务应用:计算未来投资值
- 2-22 财务应用:货币单位
- 2-23 驾驶费用
心血来潮补一下之前没做完的课后题,争取全部做完,欢迎大家评论指正。
需要书籍或者相关资料可以私聊!!!
2-1 将摄氏温度转换为华氏温度
import java.util.Scanner;
public class Program2_1 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter a degree in Celsius:");
double C = input.nextDouble();
double F = (9.0 / 5) * C + 32.0;
System.out.println(C + " Celsius is " + F + " Fahrenheit.");
}
}
2-2 计算圆柱体的体积
import java.util.Scanner;
public class Program2_2 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter the radius and length of a cylinder:");
double radius = input.nextDouble();
double length = input.nextDouble();
double area = radius * radius * Math.PI;
double volume = area * length;
System.out.println("The area is " + area);
System.out.println("The volume is " + volume);
}
}
2-3 将英尺转换为米
import java.util.Scanner;
public class Program2_3 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter a value for feet:");
double feet = input.nextDouble();
double meter = feet * 0.305;
System.out.println(feet + " feet is " + meter + " meters.");
}
}
2-4 将磅转换为千克
import java.util.Scanner;
public class Program2_4 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter a number in pounds:");
double pound = input.nextDouble();
double kilograms = pound * 0.454;
System.out.println(pound + " pounds is " + kilograms + " kilograms");
}
}
2-5 财务应用程序:计算小费
import java.util.Scanner;
public class Program2_5 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter the subtotal and a gratuity rate:");
double subtotal = input.nextDouble();
double gratuity_rate = input.nextDouble();
double gratuity = subtotal * gratuity_rate / 100;
double total = subtotal + gratuity;
System.out.println("The gratuity is $" + gratuity + " and total is $" + total);
}
}
2-6 求一个整数各位数的和
import java.util.Scanner;
public class Program2_6 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter a number between 0 and 1000:");
int number = input.nextInt();
int sum = number/100 + number % 10 + (number / 10) % 10;
System.out.println("The sum of the digit is " + sum);
}
}
2-7 求出年数
import java.util.Scanner;
public class Program2_7 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter the number of minutes:");
int minutes = input.nextInt();
int years = minutes / 60 / 24 / 365;
int days = minutes / 60 / 24 % 365;
System.out.println(minutes + " minutes is approximately " + years + " years and " + days + " days");
}
}
2-8 当前时间
import java.util.Scanner;
public class Program2_8 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter the time zone offset to GMT:");
int change = input.nextInt();
long totalMilliseconds = System.currentTimeMillis();
long totalSeconds = totalMilliseconds / 1000;
long currentSeconds = totalSeconds % 60;
long totalMinutes = totalSeconds / 60;
long currentMinutes = totalMinutes % 60;
long totalHours = totalMinutes / 60;
long currentHours = totalHours % 24;
long Hours = currentHours + change;
System.out.println("The current time is " + Hours + ":" + currentMinutes + ":" + currentSeconds);
}
}
2-9 物理:加速度
import java.util.Scanner;
public class Program2_9 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter v0, v1 and t: ");
double v0 = input.nextDouble();
double v1 = input.nextDouble();
double t = input.nextDouble();
double a = (v1 - v0) / t;
System.out.println("The average acceleration is " + a);
}
}
2-10 科学:计算能量
import java.util.Scanner;
public class Program2_10 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter the amount of water in kilograms: ");
double m = input.nextDouble();
System.out.print("Enter the initial temperature: ");
double t0 = input.nextDouble();
System.out.print("Enter the final temperature: ");
double t1 = input.nextDouble();
double q = m * (t1 - t0) * 4184;
System.out.println("The energy needed is " + q);
}
}
2-11 人口统计
import java.util.Scanner;
public class Program2_11 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter the number of years: ");
int year = input.nextInt();
double add = 365*24*60*60/7.0 - 365*24*60*60/13.0 + 365*24*60*60/45.0;
System.out.printf("The population in %d years is %.0f\n", year, (312032486 + add * year));
}
}
2-12 物理:求出跑到长度
import java.util.Scanner;
public class Program2_12 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter speed and acceleration:");
double v = input.nextDouble();
double a = input.nextDouble();
double length = v * v / 2 / a;
System.out.println("The minimum runway length for this airplane is " + length);
}
}
2-13 财务应用程序:复利值
import java.util.Scanner;
public class Program2_13 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter the monthly saving amount: ");
double amount = input.nextDouble();
double account;
account = amount * (1 + (0.05 / 12));
for(int i = 2; i <= 6; i++)
account = (amount + account) * (1 + (0.05 / 12));
System.out.printf("After the sixth month, the account value is $%.2f", account);
}
}
2-14 医疗应用程序:计算BMI
import java.util.Scanner;
public class Program2_14 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter weight in pounds:");
double pounds = input.nextDouble();
System.out.print("Enter height in inches:");
double height = input.nextDouble();
double BMI = (pounds * 0.45359237) / (height * 0.0254) / (height * 0.0254);
System.out.println("Bmi is " + BMI);
}
}
2-15 几何:两点间距离
import java.util.Scanner;
public class Program2_15 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter x1 and y1:");
double x1 = input.nextDouble();
double y1 = input.nextDouble();
System.out.print("Enter x2 and y2:");
double x2 = input.nextDouble();
double y2 = input.nextDouble();
double distance = Math.pow((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1), 0.5);
System.out.println("The distance between the two points is " + distance);
}
}
2-16 几何:六边形面积
import java.util.Scanner;
public class Program2_16 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter the side: ");
double s = input.nextDouble();
double area = 3 * Math.sqrt(3) * s * s / 2;
System.out.println("The area of the hexagon is " + area);
}
}
2-17 科学:风寒温度
import java.util.Scanner;
public class Program2_17 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter the temperature in Fahrenheit between -58F and 41F:");
double ta = input.nextDouble();
System.out.print("Enter the wind speed (>=2) in miles per hour: ");
double v = input.nextDouble();
double twc = 35.74 + 0.6215*ta - 35.75 * Math.pow(v, 0.16) + 0.4275 * ta * Math.pow(v, 0.16);
System.out.println("The wind chill index is " + twc);
}
}
2-18 打印表格
public class Program2_18 {
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("a b pow(a,b)");
System.out.println("1 2 " + (int)Math.pow(1,2));
System.out.println("2 3 " + (int)Math.pow(2,3));
System.out.println("3 4 " + (int)Math.pow(3,4));
System.out.println("4 5 " + (int)Math.pow(4,5));
System.out.println("5 6 " + (int)Math.pow(5,6));
}
}
2-19 几何:三角形的面积
import java.util.Scanner;
public class Program2_19 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("Enter thre points for a triangle:");
double x1 = input.nextDouble();
double y1 = input.nextDouble();
double x2 = input.nextDouble();
double y2 = input.nextDouble();
double x3 = input.nextDouble();
double y3 = input.nextDouble();
double edge1 = Math.pow((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1), 0.5);
double edge2 = Math.pow((x2 - x3) * (x2 - x3) + (y2 - y3) * (y2 - y3), 0.5);
double edge3 = Math.pow((x3 - x1) * (x3 - x1) + (y3 - y1) * (y3 - y1), 0.5);
double s = (edge1 + edge2 + edge3) / 2;
double area = Math.pow(s * (s - edge1) * (s - edge2) * (s - edge3),0.5);
System.out.println("The area of the triangle is " + area);
}
}
2-20 财务应用程序:计算利息
import java.util.Scanner;
public class Program2_20 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter balance and interest rate (e.g., 3 for 3%): ");
double balance = input.nextDouble();
double rate = input.nextDouble();
double interest = balance * (rate / 1200);
System.out.printf("The interest is %.5f", interest);
}
}
2-21 财务应用:计算未来投资值
import java.util.Scanner;
public class Program2_21 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter investment amount: ");
double amount = input.nextDouble();
System.out.print("Enter annual interest rate in percentage: ");
double rate = input.nextDouble();
System.out.print("Enter number of years: ");
int years = input.nextInt();
double accumulated = amount * Math.pow(1+rate/1200.0, years*12);
System.out.printf("Accumulated value is $%.2f", accumulated);
}
}
2-22 财务应用:货币单位
import java.util.Scanner;
public class Program2_22 {
public static void main(String[] args) {
// Create a Scanner
Scanner input = new Scanner(System.in);
// Receive the amount
System.out.print(
"Enter an amount in int, for example 1156 pennies: ");
int amount = input.nextInt();
int remainingAmount = amount;
// Find the number of one dollars
int numberOfOneDollars = remainingAmount / 100;
remainingAmount = remainingAmount % 100;
// Find the number of quarters in the remaining amount
int numberOfQuarters = remainingAmount / 25;
remainingAmount = remainingAmount % 25;
// Find the number of dimes in the remaining amount
int numberOfDimes = remainingAmount / 10;
remainingAmount = remainingAmount % 10;
// Find the number of nickels in the remaining amount
int numberOfNickels = remainingAmount / 5;
remainingAmount = remainingAmount % 5;
// Find the number of pennies in the remaining amount
int numberOfPennies = remainingAmount;
// Display results
System.out.println("Your amount " + amount + " consists of");
System.out.println(" " + numberOfOneDollars + " dollars");
System.out.println(" " + numberOfQuarters + " quarters ");
System.out.println(" " + numberOfDimes + " dimes");
System.out.println(" " + numberOfNickels + " nickels");
System.out.println(" " + numberOfPennies + " pennies");
}
}
2-23 驾驶费用
import java.util.Scanner;
public class Program2_23 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter the driving distance: ");
double distance = input.nextDouble();
System.out.print("Enter miles per gallon: ");
double mile = input.nextDouble();
System.out.print("Enter price per gallon: ");
double price = input.nextDouble();
double cost = distance / mile * price;
System.out.printf("The cost of driving is $%.2f\n", cost);
}
}
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