Java语言程序设计基础篇第十版梁勇课后答案

第一章1.1 public class Testpublic static void main(String args)System.out.println("Welcome to Java !");System.out.println("Welcome to Computer Science !");System.out.println("Programming is fun .");1.2 public class Testpublic static void main(String args)for(int i = 0;i <= 4;i+)System.out.println("Welcome to Java !");1.3 public class Testpublic static void main(String args)System.out.println(" ");System.out.println(" ");System.out.println(" ");System.out.println(" ");public class Testpublic static void main(String args)System.out.println(" A");System.out.println(" A A");System.out.println(" AAAAA");System.out.println("A A");public class Testpublic static void main(String args)System.out.println("V V");System.out.println(" V V");System.out.println(" V V");System.out.println(" V");1.4 public class Testpublic static void main(String args)System.out.println("a a2 a3");System.out.println("1 1 1");System.out.println("2 4 8");System.out.println("3 9 27");System.out.println("4 16 64");1.5 public class Testpublic static void main(String args)System.out.println(9.5*4.5-2.5*3)/(45.5-3.5);1.6 public class Testpublic static void main(String args)int i = 1,sum = 0;for(;i <= 9;i+)sum += i;System.out.println(sum);1.7 public class Testpublic static void main(String args)System.out.println(4*(1.0-1.0/3+1.0/5-1.0/7+1.0/9-1.0/11);System.out.println(4*(1.0-1.0/3+1.0/5-1.0/7+1.0/9-1.0/11+1.0/13);1.8 public class Testpublic static void main(String args)final double PI = 3.14;double radius = 5.5;System.out.println(2 * radius * PI);System.out.println(PI * radius * radius);1.9 public class Testpublic static void main(String args)System.out.println(7.9 * 4.5);System.out.println(2 * (7.9 + 4.5);1.10 public class Testpublic static void main(String args)double S = 14 / 1.6;double T = 45 * 60 + 30;double speed = S / T;System.out.println(speed);1.11 public class Testpublic static void main(String args)int BN = 312032486; /original person numbersdouble EveryYS,EveryYBP,EveryYDP,EveryYMP;EveryYS = 365 * 24 * 60 * 60;EveryYBP = EveryYS / 7;EveryYDP = EveryYS / 13;EveryYMP = EveryYS / 45;int FirstYP,SecondYP,ThirdYP,FourthYP,FivthYP;FirstYP = (int)(BN + EveryYBP + EveryYMP - EveryYDP);SecondYP = (int)(FirstYP + EveryYBP + EveryYMP - EveryYDP);ThirdYP = (int)(SecondYP + EveryYBP + EveryYMP - EveryYDP);FourthYP = (int)(ThirdYP + EveryYBP + EveryYMP - EveryYDP);FivthYP = (int)(FourthYP + EveryYBP + EveryYMP - EveryYDP);System.out.println(FirstYP);System.out.println(SecondYP);System.out.println(ThirdYP);System.out.println(FourthYP);System.out.println(FivthYP);1.12 public class Testpublic static void main(String args)double S = 24 * 1.6;double T = (1 * 60 + 40) * 60 + 35;double speed = S / T;System.out.println(speed);1.13 import java.util.Scanner;public class Testpublic static void main(String args)Scanner input = new Scanner(System.in);System.out.println("input a,b,c,d,e,f value please:");double a = input.nextDouble();double b = input.nextDouble();double c = input.nextDouble();double d = input.nextDouble();double e = input.nextDouble();double f = input.nextDouble();double x,y;x = (e * d - b * f) / (a * d - b * c);y = (a * f - e * c) / (a * d - b * c);System.out.println("The result is x: "+(int)(x * 1000) / 1000.0);System.out.println("The result is y: "+(int)(y * 1000) / 1000.0);第二章package cn.Testcx;import java.util.Scanner;public class lesson2 public static void main(String args)SuppressWarnings("resource")Scanner input =new Scanner(System.in); System.out.print("请输入一个摄氏温度： ");double Celsius =input.nextDouble();double Fahrenheit =(9.0/5)*Celsius+32;System.out.println("摄氏温度："+Celsius+"度 "+"转换成华氏温度为："+Fahrenheit+"度");System.out.print("请输入圆柱的半径和高： ");double radius =input.nextDouble();int higth = input.nextInt();double areas =radius*radius*Math.PI;double volume =areas*higth;System.out.println("圆柱体的面积为："+areas);System.out.println("圆柱体的体积为："+volume);System.out.print("输入英尺数：");double feet =input.nextDouble();double meters =feet*0.305;System.out.println(feet+"英尺转换成米："+meters);System.out.print("输入一个磅数：");double pounds =input.nextDouble();double kilograms =pounds*0.454;System.out.println(pounds+"磅转换成千克为："+kilograms);System.out.println("输入分钟数：");long minutes =input.nextInt();long years =minutes/(24*60*365);long days = (minutes%(24*60*365)/(24*60);System.out.println(minute