java语言程序设计(基础篇)第二章程序练习题答案
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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("Enter a degree in celsius: ");
double Celsius = input.nextDouble();
double Fahrenheit;
Fahrenheit = (9.0/5) * Celsius + 32;
System.out.println(Celsius+ " Celsius is"+ Fahrenheit + " Fahrenheit");
}
}
2.2（计算圆柱体的体积）
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("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 test {
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 meters = feet * 0.305;
System.out.println(feet+ " feet is " + meters + " 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("Enter a number in pounds: ");
double pounds = input.nextDouble();
double kilograms = pounds * 0.454;
System.out.println(pounds + " pounds is " + kilograms
+ " kilograms");
}
}
2.5（财务应用程序：计算消费）
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 subtotal and gratuity rate: ");
double subtotal = input.nextDouble();
double Gratuity = input.nextDouble();
double gratuity = subtotal * Gratuity * 0.01;
double total = gratuity + subtotal;
System.out.println("The gratuity is $" + gratuity + " and total is " + 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("Enter a number between 0 and 1000: ");
int number = input.nextInt();
int sum = number % 10 + (number / 10) % 10 + (number / 100) % 10;
System.out.println("The sum of the digits is " + sum);
}
}
2.7（求出年数）
import java.util.Scanner;