第七周作业

1.编写一个简单程序，要求数组长度为5，静态赋值10，20，30，40，50，在控制台输出该数组的值

package kzy;

import java.util.Scanner;

public class kangkang {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

         Scanner input=new Scanner(System.in);
            int a[]=new int[] {10,20,30,40,50};
            for (int i = 0; i < a.length; i++) {
                System.out.println(a[i]);
            }
        }

    }

2.编写一个简单程序，要求数组长度为5，动态赋值，并在控制台输出该数组的值。

package kzy;

import java.util.Scanner;

public class kangkang {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

         Scanner input=new Scanner(System.in);
            int a[]=new int[5];
            System.out.println("输入五个数");
            for (int i = 0; i < a.length; i++) {
                a[i]=input.nextInt();
            }
            for (int i = 0; i < a.length; i++) {
                System.out.println(a[i]);
            }
        }

    }

 3.定义字符型数组，分别存储c、h、 i、n、a 并在控制台输出

package kzy;

import java.util.Scanner;

public class kangkang {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        Scanner input=new Scanner(System.in);
        char a[]=new char[] {'b','r','t','g','h'};
        for (int i = 0; i < a.length; i++) {
            System.out.println(a[i]);
        }
    }

}

 4.输入5个学生成绩，求总分和平均分

package kzy;

import java.util.Scanner;

public class kangkang {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

         Scanner input=new Scanner(System.in);
            double a[]=new double[5];
            double sum=0;

            System.out.println("输入五个成绩");
            for (int i = 0; i < a.length; i++) {
                a[i]=input.nextInt();
                sum+=a[i];
            }
            double jun=sum/5;
            System.out.println("总分"+sum+"平均分"+jun);
        }

    }

 5.定义数组{12,53,23,44,53} 用for和foreach分别输出，再倒序输出

package kzy;

import java.util.Scanner;

public class kangkang {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

         Scanner input = new Scanner(System.in);
            int a[]=new int[] {12,53,23,44,53};
            for (int i = 0; i < a.length; i++) {
                System.out.println(a[i]);
            }
            System.out.println("再次输出");
          
            for (int i = 4; i>-1; i--) {
                System.out.println(a[i]);
            }
        }

    }

 

6定义一个整型数组，赋值(动态静态都可以)后求出奇数个数和偶数个数

package kzy;

import java.util.Scanner;

public class kangkang {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        Scanner input=new Scanner(System.in);
        int a[]=new int[5];
        int c=0,b=0;
        System.out.println("输入5个数");
        for (int i = 0; i < a.length; i++) {
            a[i]=input.nextInt();
        }
        for (int i = 0; i < a.length; i++) {
            if (a[i]%2==0) {            
                b++;
            }else {                
                c++;
            }
        }
        System.out.println("奇数"+c+"个");
        System.out.println("偶数"+b+"个");
    }

}

7.生成一个100长度数组，里面的数分别是1-100，并输出

package kzy;
import java.util.Random;
import java.util.Scanner;

public class kangkang {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        Random b=new Random();
        int a[]=new int[100];
        for (int i = 0; i < a.length; i++) {
            a[i]=b.nextInt(100);
            System.out.print(a[i]+",");
        }
    }

}

　　

 

 8.定义一个double数组，存放10个学生的成绩，给所有同学加5分，不能超过100分。

package kzy;
import java.util.Random;
import java.util.Scanner;

public class kangkang {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        Random b=new Random();
        double a[]=new double[10];
        System.out.println("输入10个学生的成绩");
        for (int i = 0; i < a.length; i++) {
            a[i]=input.nextDouble();
        }
        for (int i = 0; i < a.length; i++) {
            if (a[i]+5<=100) {
                a[i]=a[i]+5;
                System.out.println("成绩加5分为"+a[i]);
            }else {
                System.out.println("95分及以上"+a[i]);
            }
        }
    }

}