《Java语言程序设计与数据结构》编程练习答案（第三章）（三）
2024-05-20 12:28:17
《Java语言程序设计与数据结构》编程练习答案（第三章）（三）
英文名：Introduction to Java Programming and Data Structures, Comprehensive Version, 11th Edition
3.24
public class book {public static void main(String[] args){int num = (int)(Math.random()*13);int dick = (int)(Math.random()*4);String[] nums = {"Ace","2","3","4","5","6","7","8","9","10","Jack","Queen","King"};String[] dicks = {"Clubs","Diamonds","Hearts","Spades"};System.out.println("The card you picked is "+nums[num]+" of "+dicks[dick]);}
}3.25
import java.util.Scanner;
public class book {public static void main(String[] args){System.out.print("Enter x1, y1, x2, y2, x3, y3, x4, y4: ");Scanner input = new Scanner(System.in);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 x4 = input.nextDouble();double y4 = input.nextDouble();double a = y1-y2;double b = x2-x1;double c = y3-y4;double d = x4-x3;double e = (y1-y2)*x1-(x1-x2)*y1;double f = (y3-y4)*x3-(x3-x4)*y3;double jb = a*d-b*c;if(jb==0)System.out.println("The two lines are parallel");elseSystem.out.println("The intersecting point is at ("+(e*d-b*f)/jb+", "+(a*f-e*c)/jb+")");}
}3.26
import java.util.Scanner;
public class book {public static void main(String[] args){System.out.print("Enter an integer: ");Scanner input = new Scanner(System.in);int n = input.nextInt();System.out.println("Is "+n+" divisible by 5 and 6? "+(n%5==0&&n%6==0));System.out.println("Is "+n+" divisible by 5 or 6? "+(n%5==0||n%6==0));System.out.println("Is "+n+" divisible by 5 or 6, but not both? "+(n%5==0^n%6==0));}
}3.27
import java.util.Scanner;
public class book {public static void main(String[] args){System.out.print("Enter a point's x- and y- coordinates: ");Scanner input = new Scanner(System.in);double x = input.nextDouble();double y = input.nextDouble();if(x>=0&&x<=200&&y>=0&&y<=100-0.5*x)System.out.println("The point is in the triangle");elseSystem.out.println("The point is not in the triangle");}
}3.28
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter r1's center x-, y-coordinates, width, and height: ");double x1 = input.nextDouble();double y1 = input.nextDouble();double w1 = input.nextDouble();double h1 = input.nextDouble();System.out.print("Enter r2's center x-, y0coordinates, width, and height: ");double x2 = input.nextDouble();double y2 = input.nextDouble();double w2 = input.nextDouble();double h2 = input.nextDouble();if((x1+w1/2>=x2+w2/2)&&(x1-w1/2<=x2-w2/2)&&(y1+h1/2>=y2+h2/2)&&(y1-h1/2<=y2-h2/2))System.out.println("r2 is inside r1");else if((x2-w2/2>x1+w1/2)||(x2+w2/2<x1-w1/2)||(y2-h2/2>y1+h1/2)||(y2+h2/2<y1-h1/2))System.out.println("r2 does not overlap r1");else if((x2+w2/2>=x1+w1/2)&&(x2-w2/2<=x1-w1/2)&&(y2+h2/2>=y1+h1/2)&&(y2-h2/2<=y1-h1/2))System.out.println("r1 is inside r2");elseSystem.out.println("r2 overlaps r1");}
}3.29
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter circle's center x-, y-coordinates, and radius: ");double x1 = input.nextDouble();double y1 = input.nextDouble();double r1 = input.nextDouble();System.out.print("Enter circle2's center x-, y-coordinates, and radius: ");double x2 = input.nextDouble();double y2 = input.nextDouble();double r2 = input.nextDouble();if(Math.pow((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2),0.5)<=Math.abs(r1-r2))System.out.println("circle2 is inside circle1");else if(Math.pow((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2),0.5)<=r1+r2)System.out.println("circle2 overlaps circle1");elseSystem.out.println("circle2 does not overlap circle1");}
}3.30
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter the time zone offset to GMT:");long offset = input.nextLong();long totalMilliseconds = System.currentTimeMillis();totalMilliseconds+=offset*60*60*1000;long totalSeconds = totalMilliseconds/1000;long currentSecond = totalSeconds%60;long totalMinutes = totalSeconds/60;long currentMinute = totalMinutes%60;long totalHours = totalMinutes/60;long currentHour = totalHours%24;String tail = "AM";if(currentHour>12){currentHour-=12;tail="PM";}System.out.println("Current time is "+currentHour+":"+currentMinute+":"+currentSecond+" "+tail);}
}3.31
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter the exchange rate from dollar to RMB: ");double rate = input.nextDouble();System.out.print("Enter 0 to convert dollars to RMB and 1 vice versa: ");int sig = input.nextInt();double in = 0;double out = 0;String moneyType = "";if(sig==0)moneyType="dollar";else if(sig==1)moneyType="RMB";elseSystem.out.println("Incorrect input");if(sig==0||sig==1){System.out.print("Enter the "+moneyType+" amount: ");in = input.nextDouble();if(sig==0){out = in*rate;System.out.println("$"+in+" is "+out+" yuan");}else{out = in/rate;System.out.println(in+" yuan is $"+out);}}}
}3.32
import java.util.Scanner;
public class book {public static void main(String[] args){System.out.print("Enter three points for p0, p1, and p2: ");Scanner input = new Scanner(System.in);double x0 = input.nextDouble();double y0 = input.nextDouble();double x1 = input.nextDouble();double y1 = input.nextDouble();double x2 = input.nextDouble();double y2 = input.nextDouble();double result = (x1-x0)*(y2-y0)-(x2-x0)*(y1-y0);if(result>0)System.out.println("p2 is on the left side of the line");else if(result==0)System.out.println("p2 is on the same line");elseSystem.out.println("p2 is on the right side of the line");}
}3.33
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter weight and price for package 1: ");double w1 = input.nextDouble();double p1 = input.nextDouble();System.out.print("Enter weight and price for package 2: ");double w2 = input.nextDouble();double p2 = input.nextDouble();double av1 = p1/w1;double av2 = p2/w2;if(av1<av2)System.out.println("Package 1 has a better price.");else if(av1==av2)System.out.println("Two packages have the same price.");elseSystem.out.println("Package 2 has a better price.");}
}3.34
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter three points for p0, p1, and p2: ");double x0 = input.nextDouble();double y0 = input.nextDouble();double x1 = input.nextDouble();double y1 = input.nextDouble();double x2 = input.nextDouble();double y2 = input.nextDouble();if((x1-x0)*(y2-y0)-(x2-x0)*(y1-y0)==0&&x2>=x0&&x2<=x1)System.out.println("("+x2+", "+y2+") is on the line segment from ("+x0+", "+y0+") to ("+x1+", "+y1+")");elseSystem.out.println("("+x2+", "+y2+") is not on the line segment from ("+x0+", "+y0+") to ("+x1+", "+y1+")");}
}第三章 完
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