JAVA语言程序设计（基础篇）第十版课后题答案（第一章）

JAVA语言程序设计（基础篇）第十版课后题答案
第一章
第二题
/**

• Created by ysy on 2018/7/6.
  */
  public class text2 {

  public static void main(String[] args){
  for(int i = 0; i < 5; i++)
  System.out.println(“Welcome to Java”);
  }

}

第三题
/**

• Created by ysy on 2018/7/6.
  */
  public class text3 {
  public static void main(String[] args){
  System.out.println(" J A V V A");
  System.out.println(" J A A V V A A");
  System.out.println(“J J AAAAA V V AAAAA”);
  System.out.println(" JJ A A V A A");
  }
  }
  第四题
  import java.util.Scanner;

/**

• Created by ysy on 2018/7/6.
  *对输入数据求解一次方，平方，三次方
  */
  public class text4 {

  public static void main(String[] args){

   Scanner input = new Scanner(System.in);
   char[] temp = new char[10];
   int num;
   for(int i = 0; i < 5; ++i){
       String Stemp;
       System.out.println("请输入数据：");
       Stemp = input.next();
       temp = Stemp.toCharArray();
       if(temp[0] >= 'a' && temp[0] <= 'z'){
           System.out.println(temp[0]+"    "+temp[0]+"^2    " + temp[0] + "^3");
       }
       else if(temp[0] >= '0' && temp[0] <= '9'){
           num = temp[0] - '0';
           System.out.println(num+"    "+(int)Math.pow(num, 2)+"    "+(int)Math.pow(num, 3));
       }
  
   }
  

  }
  }

第七题
import java.util.Scanner;

/**

• Created by ysy on 2018/7/6.
  *对输入数据求解一次方，平方，三次方
  */
  public class text4 {

  public static void main(String[] args){

   Scanner input = new Scanner(System.in);
   char[] temp = new char[10];
   int num;
   for(int i = 0; i < 5; ++i){
       String Stemp;
       System.out.println("请输入数据：");
       Stemp = input.next();
       temp = Stemp.toCharArray();
       if(temp[0] >= 'a' && temp[0] <= 'z'){
           System.out.println(temp[0]+"    "+temp[0]+"^2    " + temp[0] + "^3");
       }
       else if(temp[0] >= '0' && temp[0] <= '9'){
           num = temp[0] - '0';
           System.out.println(num+"    "+(int)Math.pow(num, 2)+"    "+(int)Math.pow(num, 3));
       }
  
   }
  

  }
  }

第八题

/**

• Created by ysy on 2018/7/6.
  */
  public class text8 {
  static double pi=3.14;
  public static void main(String arg[]){

   double r=5.5;
   double a=getLength(r);
   double b=getArea(r);
   System.out.println("周长:"+a);
   System.out.println("面积:"+b);
  

  }

  public static double getLength(double r){
  return 2rpi;
  }

  public static double getArea(double r){
  return rrpi;
  }

}

第九题
/**

• Created by ysy on 2018/7/6.
  */
  public class text9 {
  public static void main(String[] arg){
  double a=14/1.6;
  double t=45.5/60;
  double v=a/t;
  System.out.println(“速度”+v);
  }
  }

第十一题

/**

• Created by ysy on 2018/7/6.
  /
  public class text11 {
  public static void main(String arg[]){
  int now_num=312032486;
  int time=365246060;
  int spring=time/7;
  int die=time/13;
  int move=time/45;
  int num=now_num+spring-die+move;
  System.out.println(num);
  }
  }

第十二题

/**

• Created by ysy on 2018/7/6.
  /
  public class text12 {
  public static void main(String[] arg){
  double a=3.4;
  double b=50.24;
  double c=2.1;
  double d=0.55;
  double e=44.5;
  double f=5.9;
  double x=(ed-bf)/(ad-bc);
  double y=(af-ec)/(ad-b*c);
  System.out.println(“x:”+x);
  System.out.println(“y:”+y);

  }
  }