明解JAVA 第三章答案

2020 年 5 月 11 日
筆記
明解JAVA

练习3-1

package candle1220;

import java.util.Scanner;

public class Nightwatch { 
    public static void main(String[] args){
        Scanner stdIn=new Scanner(System.in);
    System.out.print("整数值");
    int n=stdIn.nextInt();
    if(n>0) 
        System.out.println("其绝对值是"+(n));
        else 
            System.out.println("其绝对值是"+(-n));
    }
}

练习3-2

package candle1220;

import java.util.Scanner;

public class Nightwatch { 
    public static void main(String[] args){
        Scanner stdIn=new Scanner(System.in);
    System.out.print("整数A：");
    int a=stdIn.nextInt();
    System.out.print("整数B：");
    int b=stdIn.nextInt();
    if(a%b==0) 
        System.out.println(b+"是"+a+"的约数");
        else 
            System.out.println(b+"不是"+a+"的约数");
    }
}

练习3-3

同样可以运行

练习3-4

————恢复内容开始————

练习3-1

package candle1220;

import java.util.Scanner;

public class Nightwatch { 
    public static void main(String[] args){
        Scanner stdIn=new Scanner(System.in);
    System.out.print("整数值");
    int n=stdIn.nextInt();
    if(n>0) 
        System.out.println("其绝对值是"+(n));
        else 
            System.out.println("其绝对值是"+(-n));
    }
}

练习3-2

package candle1220;

import java.util.Scanner;

public class Nightwatch { 
    public static void main(String[] args){
        Scanner stdIn=new Scanner(System.in);
    System.out.print("整数A：");
    int a=stdIn.nextInt();
    System.out.print("整数B：");
    int b=stdIn.nextInt();
    if(a%b==0) 
        System.out.println(b+"是"+a+"的约数");
        else 
            System.out.println(b+"不是"+a+"的约数");
    }
}

练习3-3

同样可以运行

练习3-4

import java.util.Scanner;  
public class New{

    public static void main(String[] args){
        Scanner input=new Scanner (System.in);
        
        System.out.print("a:");
        int a=input.nextInt();
        System.out.print("b:");
        int b=input.nextInt();
        if(a>b)
            System.out.print("a更大");
        else
            if(a==b)
                System.out.print("一样大");
            else
                System.out.print("b更大");
    }
}

练习3-5

import java.util.Scanner;  
public class New{

    public static void main(String[] args){
        Scanner input=new Scanner (System.in);
        
        System.out.print("请输入一个正整数:");
        int a=input.nextInt();
        if(a<=0)
            System.out.print("请输入正整数");
            else if(a%5==0)
            System.out.print("该值可以被5整除");
            else
                System.out.print("该值不可以被5整除");
    }
}

练习3-6

import java.util.Scanner;  
public class New{

    public static void main(String[] args){
        Scanner input=new Scanner (System.in);
        
        System.out.print("请输入一个正整数:");
        int a=input.nextInt();
        if(a<=0)
            System.out.print("请输入正整数");
            else if(a%10==0)
            System.out.print("该值是10的倍数");
            else
                System.out.print("该值不是10的倍数");
    }
}

练习3-7

import java.util.Scanner;  
public class New{

    public static void main(String[] args){
        Scanner input=new Scanner (System.in);
        
        System.out.print("请输入一个正整数:");
        int a=input.nextInt();
        if(a<=0)
            System.out.print("请输入正整数");
            else if(a%3==0)
            System.out.print("该值可以被3整除");
            else if(a%3==1)
                System.out.print("该值除以3余1");
            else 
                System.out.print("该值除以3余2");
    }
}

练习3-8

import java.util.Scanner;  
public class New{

    public static void main(String[] args){
        Scanner input=new Scanner (System.in);
        System.out.print("请输入分数:");
        int a=input.nextInt();
        if(a>=0&&a<60)
            {System.out.println("不及格");}
        else if(a>=60&&a<70)
        {System.out.println("及格");}
        else if(a>=70&&a<80)
        {System.out.println("良");}
        else if(a>=80&&a<=100)
        {System.out.println("优");}
        else 
        {System.out.println("请输入合理的分数");}
        
}
}

练习3-9

import java.util.Scanner;  
public class New{

    public static void main(String[] args){
        Scanner input=new Scanner (System.in);
        System.out.print("a=:");
        int a=input.nextInt();
        System.out.print("b=:");
        int b=input.nextInt();
        System.out.print(a>b?a:b);
        
}
}

练习3-10

import java.util.Scanner;  
public class New{

    public static void main(String[] args){
        Scanner input =new Scanner (System.in);
        System.out.print("a=");
        int a=input.nextInt(); 
        System.out.print("b=");
        int b=input.nextInt(); 
        if(a>=b)
        System.out.print(a-b);
        else
        System.out.print(b-a);
            
        
}
}

练习3-11

import java.util.Scanner;  
public class New{

    public static void main(String[] args){
        Scanner input =new Scanner (System.in);
        System.out.print("a=");
        int a=input.nextInt(); 
        System.out.print("b=");
        int b=input.nextInt(); 
        int c=a-b;
        if(c>10||c<-10)
        System.out.print("它们的差值大于等于11");
        else
        System.out.print("它们的差值小于等于10");
            
        
}
}

练习3-12

import java.util.Scanner;  
public class New{

    public static void main(String[] args){
        Scanner input=new Scanner(System.in);
        System.out.print("a=");
        int a =input.nextInt();
        System.out.print("b=");
        int b =input.nextInt();
        System.out.print("c=");
        int c =input.nextInt();
        
        int min1=a<b?a:b;
        int min=min1<c?min1:c;
        System.out.print(min);
        
        
}
}

练习3-13

import java.util.Scanner;  
public class New{

    public static void main(String[] args){
        Scanner input=new Scanner (System.in);
        System.out.print("a=");
        int a =input.nextInt();
        System.out.print("b=");
        int b =input.nextInt();
        System.out.print("c=");
        int c =input.nextInt();
        
        int mid1=a<b?b:a;
        int mid=mid1<c?mid1:c;
        System.out.print(mid);

        
        
}
}

练习3-14

// 计算两个整数值中较小的值和较大的值

import java.util.Scanner;

class New {

    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);

        System.out.print("整数a：");  
        int a = stdIn.nextInt();
        System.out.print("整数b：");  
        int b = stdIn.nextInt();
         if(a==b){
            System.out.print("两个整数相等");
         }
       else{
            int min, max;        // 较小的值／较大的值
            if (a < b) {        // 如果a小于b
            min = a;
            max = b;
        } 
        
        else
        {                // 否则
            min = b;
            max = a;
        }

        System.out.println("较小的值是" + min + "。");
        System.out.println("较大的值是" + max + "。");
        }
        
        
    }
}

练习3-15

// 计算两个整数值中较小的值和较大的值

import java.util.Scanner;

class New {

    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);

        System.out.print("整数a：");  
        int a = stdIn.nextInt();
        System.out.print("整数b：");  
        int b = stdIn.nextInt();
         if(a==b){
            System.out.print("两个整数相等");
         }
       else{
            int min, max;        // 较小的值／较大的值
            if (a < b) {        // 如果a小于b
            min = a;
            max = b;
        } 
        
        else
        {                // 否则
            min = b;
            max = a;
        }

        System.out.print(max+" ");
        System.out.println(min);
        }
        
        
    }
}

练习3-16

import java.util.Scanner;  
public class New{

    public static void main(String[] args){
        Scanner input=new Scanner(System.in);
        System.out.print("a=");
        int a =input.nextInt();
        System.out.print("b=");
        int b =input.nextInt();
        System.out.print("c=");
        int c =input.nextInt();
        
        int min1=a<b?a:b;
        int min=min1<c?min1:c;
 
        int mid1=a<b?a:b;
        int mid=mid1>c?mid1:c;
        
        int max1=a>b?a:b;
        int max=max1>c?max1:c;
        System.out.print(min+" ");        
        System.out.print(mid+" ");        
        System.out.print(max);        
        
        
}
}

练习3-17

import java.util.Scanner;  
import java.util.Random;
public class New{

    public static void main(String[] args){
      Scanner input=new Scanner(System.in);
      Random rand=new Random();
      int a=rand.nextInt(3);
      switch(a){
          case 0:System.out.println("石头");break;
          case 1:System.out.println("剪刀");break;
          case 2:System.out.println("布"); break;
          
      }
        
}
}

练习3-18

import java.util.Scanner;  
public class New{

    public static void main(String[] args){
      Scanner input=new Scanner(System.in);
      System.out.print("输入月份:");
      int mouth=input.nextInt();
      switch(mouth){
          case 1:
          case 2:
          case 3:System.out.println("春");
          case 4:
          case 5:
          case 6:System.out.println("夏");
          case 7:
          case 8:
          case 9:System.out.println("秋");
          case 10:
          case 11:
          case 12:System.out.println("冬");
         
          
      }
        
}
}

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明解JAVA 第三章答案

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明解JAVA 第三章答案

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