java语言程序设计(基础篇)第二章程序练习题答案

2.1（将摄氏温度转化为华氏温度）

import java.util.*; public class test { }

public static void main(String[] args) { }

// TODO Auto-generated method stub Scanner input = new Scanner(System.in);

System.out.print(\); double Celsius = input.nextDouble();

double Fahrenheit;

Fahrenheit = (9.0/5) * Celsius + 32;

System.out.println(Celsius + \ + Fahrenheit + \

Fahrenheit\);

2.2（计算圆柱体的体积）

import java.util.*;

public class test { }

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public static void main(String[] args) { }

// TODO Auto-generated method stub Scanner input = new Scanner(System.in);

System.out.print(\); double radius = input.nextDouble(); double length =input.nextDouble();

double area = radius * radius * Math.PI; double volume = area * length;

System.out.println(\ + area); System.out.println(\ + volume);

2.3（将英尺转换为米）

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(\); double feet = input.nextDouble();

double meters = feet * 0.305;

System.out.println(feet+ \ + meters + \);

2.4（将磅转换为千克）

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(\); double pounds = input.nextDouble();

double kilograms = pounds * 0.454;

System.out.println(pounds + \ + kilograms + \);

2.5（财务应用程序：计算消费）

import java.util.Scanner;

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public class test { }

public static void main(String[] args) { }

// TODO Auto-generated method stub Scanner input = new Scanner(System.in);

System.out.print(\); double subtotal = input.nextDouble(); double Gratuity = input.nextDouble();

double gratuity = subtotal * Gratuity * 0.01; double total = gratuity + subtotal;

System.out.println(\ + gratuity + \

+ total);

2.6（求一个整数个位数的和）

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(\); int number = input.nextInt();

int sum = number % 10 + (number / 10) % 10 + (number / 100) % 10; System.out.println(\ + sum);

2.7（求出年数）

import java.util.Scanner;

public class test {

public static void main(String[] args) {

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