《Java语言程序设计与数据结构》编程练习答案（第四章）（一）
2024-04-20 03:03:45
《Java语言程序设计与数据结构》编程练习答案（第四章）（一）
英文名：Introduction to Java Programming and Data Structures, Comprehensive Version, 11th Edition
4.1
import java.util.Scanner;
public class book {public static void main(String[] args){System.out.print("Enter the length from the center to a vertex: ");Scanner input = new Scanner(System.in);final double PI = 3.141592654;double r = input.nextDouble();double s = 2*r*Math.sin(PI/5);double a = 5*s*s/(4*Math.tan(PI/5));System.out.printf("The area of the pentagon is %.2f",a);}
}
4.2
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter point 1 (latitude and longitude) in degrees: ");double x1 = input.nextDouble();double y1 = input.nextDouble();System.out.print("Enter point 2 (latitude and longitude) in degrees: ");double x2 = input.nextDouble();double y2 = input.nextDouble();double d = 6371.0*Math.acos(Math.sin(Math.toRadians(x1))*Math.sin(Math.toRadians(x2))+Math.cos(Math.toRadians(x1))*Math.cos(Math.toRadians(x2))*Math.cos(Math.toRadians(y1-y2)));System.out.println("The distance between the two points is "+d+" km");}
}
4.3
public class book {public static void main(String[] args){double x1 = 35.2270869;double y1 = -80.8431267;double x2 = 32.0835407;double y2 = -81.0998342;double dcs = 6371.0*Math.acos(Math.sin(Math.toRadians(x1))*Math.sin(Math.toRadians(x2))+Math.cos(Math.toRadians(x1))*Math.cos(Math.toRadians(x2))*Math.cos(Math.toRadians(y1-y2)));x2 = 33.7489954;y2 = -84.3879824;double dca = 6371.0*Math.acos(Math.sin(Math.toRadians(x1))*Math.sin(Math.toRadians(x2))+Math.cos(Math.toRadians(x1))*Math.cos(Math.toRadians(x2))*Math.cos(Math.toRadians(y1-y2)));x1 = 28.5383355;y1 = -81.3792365;double doa = 6371.0*Math.acos(Math.sin(Math.toRadians(x1))*Math.sin(Math.toRadians(x2))+Math.cos(Math.toRadians(x1))*Math.cos(Math.toRadians(x2))*Math.cos(Math.toRadians(y1-y2)));x2 = 32.0835407;y2 = -81.0998342;double dos = 6371.0*Math.acos(Math.sin(Math.toRadians(x1))*Math.sin(Math.toRadians(x2))+Math.cos(Math.toRadians(x1))*Math.cos(Math.toRadians(x2))*Math.cos(Math.toRadians(y1-y2)));x1 = 33.7489954;y1 = -84.0998342;double das = 6371.0*Math.acos(Math.sin(Math.toRadians(x1))*Math.sin(Math.toRadians(x2))+Math.cos(Math.toRadians(x1))*Math.cos(Math.toRadians(x2))*Math.cos(Math.toRadians(y1-y2)));double s1 = (dca+dcs+das)/2;double s2 = (doa+dos+das)/2;double a = Math.sqrt(s1*(s1-dca)*(s1-dcs)*(s1-das))+Math.sqrt(s2*(s2-doa)*(s2-dos)*(s2-das));System.out.println("The area is "+a+" km^2");}
}
4.4
import java.util.Scanner;
public class book {public static void main(String[] args){final double PI = 3.141592654;Scanner input = new Scanner(System.in);System.out.print("Enter the side: ");double s = input.nextDouble();double a = 6*s*s/(4*Math.tan(PI/6));System.out.println("The area of the hexagon is "+a);}
}
4.5
import java.util.Scanner;
public class book {public static void main(String[] args){final double PI = 3.141592654;Scanner input = new Scanner(System.in);System.out.print("Enter the number of sides: ");int n = input.nextInt();System.out.print("Enter the side: ");double s = input.nextDouble();double a = n*s*s/(4*Math.tan(PI/n));System.out.println("The area of the polygon is "+a);}
}
4.6
public class book {public static void main(String[] args){final double PI = 3.141592654;double alpha1 = Math.random()*2*PI;double alpha2 = Math.random()*2*PI;double alpha3 = Math.random()*2*PI;double x1 = 40*Math.cos(alpha1);double y1 = 40*Math.sin(alpha1);double x2 = 40*Math.cos(alpha2);double y2 = 40*Math.sin(alpha2);double x3 = 40*Math.cos(alpha3);double y3 = 40*Math.sin(alpha3);double a = Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));double b = Math.sqrt((x2-x3)*(x2-x3)+(y2-y3)*(y2-y3));double c = Math.sqrt((x1-x3)*(x1-x3)+(y1-y3)*(y1-y3));double aa = Math.toDegrees(Math.acos((a*a-b*b-c*c)/(-2*b*c)));double ab = Math.toDegrees(Math.acos((b*b-a*a-c*c)/(-2*a*c)));double ac = Math.toDegrees(Math.acos((c*c-b*b-a*a)/(-2*a*b)));System.out.println("The three angles are: "+aa+" "+ab+" "+ac);}
}
4.7
import java.util.Scanner;
public class book {public static void main(String[] args){final double PI = 3.141592654;Scanner input = new Scanner(System.in);System.out.print("Enter the radius of the bounding circle: ");double r = input.nextDouble();double base = 0.1*PI;System.out.println("The coordinates of fibe points on the pentagon are");for(int i=0;i<5;i++){System.out.printf("(%.2f, %.2f)%n",r*Math.cos(base),r*Math.sin(base));base+=0.4*PI;}}
}
4.8
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Ent6er an ASCII code: ");int ass = input.nextInt();char dick = (char)ass;System.out.printf("The character for ASCII code %d is %c",ass,dick);}
}
4.9
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter a character: ");String jb = input.nextLine();char ass = jb.charAt(0);int dick = (int)ass;System.out.printf("The Unicode for the character %c is %d",ass,dick);}
}
4.10
public class book {public static void main(String[] args){//原来代码中// int answer = input.nextInt()--->char answer = input.nextLine().charAt(0)// if(answer==1)--->if(answer=='Y')}
}
4.11
import java.util.Scanner;
public class book {public static void main(String[] args){System.out.print("Enter a decimal value (0 to 15): ");Scanner input = new Scanner(System.in);int ass = input.nextInt();if(ass>=0&&ass<=15){if(ass<10)System.out.printf("The hex value is %d",ass);elseSystem.out.printf("The hex value is %c",'A'+ass-10);}elseSystem.out.printf("%d is an invalid input",ass);}
}
4.12
import java.util.Scanner;
public class book {public static void main(String[] args){String[] bins = {"0","1","10","11","100","101","110","111","1000","1001","1010","1011","1100","1101","1110","1111"};System.out.print("Enter a hex digit: ");Scanner input = new Scanner(System.in);char ass = input.nextLine().charAt(0);if(ass>='0'&&ass<='9')System.out.printf("The binary value is %s\n",bins[ass-'0']);else if(ass>='A'&&ass<='F')System.out.printf("The binary value is %s\n",bins[ass-'A'+10]);elseSystem.out.printf("%c is an invalid input\n",ass);}
}
4.13
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter a letter: ");char ass = input.nextLine().charAt(0);if((ass<='z'&&ass>='a')||(ass<='Z'&&ass>='A')){if(ass=='a'||ass=='e'||ass=='i'||ass=='o'||ass=='u'||ass=='A'||ass=='E'||ass=='I'||ass=='O'||ass=='U')System.out.println(ass+" is a vowel");elseSystem.out.println(ass+" is a consonant");}elseSystem.out.println(ass+" is an invalid input");}
}
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