第二次考核

 

码云： https://gitee.com/gs717/codes

 

第一题  7.5  

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

                Scanner in = new Scanner(System.in);

                int[] grade = new int[5];

                for(int i=0; i

                      grade[i] = in.nextInt();

                 }      

 

                RR rr = new RT(grade);

                double dd = rr.mark();

                System. out.printf("%.2f",dd);

    }

}

abstract class RR{

   int[] grade;

   public RR(int[] grade){

      this.grade = grade;

   }

   public abstract double mark();

}

class RT extends RR{

 

 

}

7.6  集体评分 

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

                Scanner in = new Scanner(System.in);

                int[] grade = new int[5];

                for(int i=0; i

                      grade[i] = in.nextInt();

                 }      

 

                RR rr = new RT(grade);

                double dd = rr.mark();

                System. out.printf("%.2f",dd);

    }

}

abstract class RR{

   int[] grade;

   public RR(int[] grade){

      this.grade = grade;

   }

   public abstract double mark();

}

class RT extends RR{

 

}

 

 

 

7.7  程序填空

 

 

public class Main {

    public static void main(String[] args) {

        Son son = new Son();

        son. method();

    }

}

class Parent {

    Parent() {

        System.out.println("Parent's Constructor without parameter");

    }

    Parent(boolean b) {

        System.out.println("Parent's Constructor with a boolean parameter");

    }

    public void method() {

        System.out.println("Parent's method()");

    }

}

class Son extends Parent {

    Son() {

        super( true);    //调用父类有参构造 ()内true或false都可以

        System.out.println("Son's Constructor without parameter");

    }

    public void method() {

        System.out.println("Son's method()");

        super. method();

    }

}

 

 

7.8 

两点距离：代码如下

package testprograme;

 

import java.util.Scanner;

 

public class xy {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

        String inputString = sc.nextLine();

        String stringArray[] = inputString.split(" ");

        int num[] = new int[stringArray.length];

        for (int i = 0; i < stringArray.length; i++) {

              num[i] = Integer.parseInt(stringArray[i]);

              System.out. println(num[i]);

        }

        int xAll = Math.abs(num[0]) + Math.abs(num[2]);

        int yAll = Math.abs(num[1]) + Math.abs(num[3]);

        double lineLength = Math.pow(xAll,2) + Math.pow(yAll,2);

        double cLength = Math.pow(lineLength, 1.0/2);

        System.out. println(cLength);

}

}

利用个 数学公式求两点间距离因为是象限 输入值可能为负数所以运用了绝对值

a^+b^=c^ 输出c^后开放  即为所求结果

 

 

 

 

转载于:https://www.cnblogs.com/gs717/p/9783857.html