《Java语言程序设计与数据结构》编程练习答案（第二章）（二）

英文名：Introduction to Java Programming and Data Structures, Comprehensive Version, 11th Edition

2.13

import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter the monthly saving amount:");double m = input.nextDouble();double sum = 0.0;for(int i=0;i<6;i++)sum = (m+sum)*(1+0.00417);System.out.println("After the sixth month, the account value is $"+sum+".");}
}

2.14

import java.util.Scanner;
public class book {public static void main(String[] args){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 inches = input.nextDouble();double bmi = pounds*0.4535927/(inches*inches*0.0254*0.0254);System.out.println("BMI is "+bmi+".");}
}

2.15

import java.util.Scanner;
public class book {public static void main(String[] args){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 d = Math.pow((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1),0.5);System.out.println("The distance between the two points is "+d+".");}
}

2.16

import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter the length of the side:");double s = input.nextDouble();double a = 3*Math.pow(3,0.5)/2*s*s;System.out.println("The area of the hexagon is "+a+".");}
}

2.17

import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter the temperature in Fahrenheit:");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 is "+twc);}
}

2.18

public class book {public static void main(String[] args){System.out.println("a    b    pow(a,b)");for(int i = 1;i <= 5;i++)System.out.println(i+"    "+(i+1)+"    "+(int)Math.pow(i,i+1));}
}

2.19

import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.println("Enter the coordinates of three points separated by spaces");System.out.print("like x1 y1 x2 y2 x3 y3:");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 s1 = Math.pow((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2),0.5);double s2 = Math.pow((x2-x3)*(x2-x3)+(y2-y3)*(y2-y3),0.5);double s3 = Math.pow((x1-x3)*(x1-x3)+(y1-y3)*(y1-y3),0.5);double s = (s1+s2+s3)/2;double a = Math.pow(s*(s-s1)*(s-s2)*(s-s3),0.5);System.out.println("The area of the triangle is "+a);}
}

2.20

import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter balance and interest rate:");double balance = input.nextDouble();double rate = input.nextDouble();double interest = balance*(rate/1200);System.out.println("The interest is "+interest);}
}

2.21

import java.util.Scanner;
public class book {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 ar = input.nextDouble();System.out.print("Enter number of years:");int y = input.nextInt();double fv = amount*Math.pow(1+ar/1200,y*12);System.out.println("Future value is $"+fv);}
}

2.22

import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter an amount in int, for example 114514:");int amount = input.nextInt();int old = amount;int numberOfOneDollars = amount/100;amount%=100;int numberOfQuarters = amount/25;amount%=25;int numberOfDimes = amount/10;amount%=10;int numberOfNickles = amount/5;amount%=5;int numberOfPennies = amount;System.out.println("Your amount "+old+" consists of");System.out.println("    "+numberOfOneDollars+" dollars");System.out.println("    "+numberOfQuarters+" quarters");System.out.println("    "+numberOfDimes+" dimes");System.out.println("    "+numberOfNickles+" nickels");System.out.println("    "+numberOfPennies+" pennies");}
}

2.23

import java.util.Scanner;
public class book {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 youhao = input.nextDouble();System.out.print("Enter price per gallon:");double youjia = input.nextDouble();double price = distance/youhao*youjia;System.out.println("The cost of driving is $"+price);}
}

第二章 完

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