第七次作业

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 xg;

import java.util.Scanner;

public class Test1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method
        int a[] = { 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 xg;

import java.util.Scanner;

public class Test1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method
        int a[] = new int[5] ;
        Scanner input=new Scanner(System.in);
        for (int i = 0; i < a.length; i++) {
            a[i]=input.nextInt();
            
        }
        
    }

}

 

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 xg;

import java.util.Scanner;

public class Test1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method
        char a[] = new char[]{'c','h','i','n','a'} ;
        
        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 xg;

import java.util.Scanner;

public class Test1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method
        int a[] = new int[5] ;
        double sum=0,b=0;
        Scanner input=new Scanner(System.in);
        System.out.println("请输入成绩");
        for (int i = 0; i < a.length; i++) {
            a[i]=input.nextInt();
            sum+=a[i];
            b=sum/5.0;
        }
        System.out.println("总和为"+sum+"平均为"+b);
    }

}

 

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

 

package xg;

public class Test5 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a[] = new int[] {12,53,23,44,53};
        for (int i = 0; i < a.length; i++) {
            System.out.println(a[i]);
        }
        for (int i = 4; i >=0; i--) {
            System.out.println(a[i]);
    }

}
}

 

1.定义一个长度为10的整型数组,赋值(动态静态都可以)后求出奇数个数和偶数个数

 

package xg;

public class Test5 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a[] = new int[] {1,2,3,4,5,6,7,8,9,10};
        int b=0,c=0;
        for (int i = 0; i < a.length; i++) {
            if(a[i]%2==0){
                b++;
            }
            else
                c++;
        }
        System.out.print("积数个数为"+b+"偶数个数为"+c);
    }

}

 

2.生成一个100长度数组,里面的数分别是1-100,并输出

 

package xg;

import java.util.Scanner;

public class Test5 {

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

        int a[] = new int[100];
        for (int i = 0; i < a.length; i++) {
            for (int j = 1; j < 101; j++) {
                a[i] = j;
                System.out.println(a[i]);
            }

            break;

        }
    }
}

 

 3.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 xg;

import java.util.Scanner;

public class Test5 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        double a[] = new double[10];
        for (int i = 0; i < a.length; i++) {
            a[i] = input.nextInt();

            if (a[i] >= 95) {
                a[i] = 100;
            } else
                a[i] = a[i] + 5;
            System.out.println(a[i]);
        }
    }
}

 

posted @ 2021-04-16 12:57  叶鑫宇  阅读(45)  评论(0编辑  收藏  举报