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。

public class TestHello {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] a = { 10, 20, 30, 40, 50 };
        for (int i : a) {
            System.out.println(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。

import java.util.Scanner;
import java.util.Random;

public class TestHello {

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

public class TestHello {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        char[] b = { 'c', 'h', 'i', 'n', 'a' };
        for (int i = 0; i < b.length; i++) {
            System.out.println(b[i]);
        }

    }

}

 

 4.输入5个学生成绩,求总分和平均分

import java.util.Scanner;
import java.util.Random;

public class TestHello {

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

        }
        System.out.println(sum);
        System.out.println(pj);

    }

}

 

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

public class TestHello {

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

    }

}

 

 

public class TestHello {

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

    }

}

 

public class TestHello {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] a = { 12, 53, 23, 44, 53 };
        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

 

public class TestHello {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
         int[] a = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
            int js = 0;
            int os = 0;
            for (int i = 0; i <a.length; i++) {
                if (a[i] % 2 == 0) {
                    os++;
                }
                if (a[i] % 2 != 0) {
                    js++;
                }
            }
            System.out.println(os);
            System.out.println(js);
        }

    }

 

 

2.生成一个100长度数组,里面的数分别是1-100,并输出

public class TestHello {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a[] = new int[100];
        for (int i = 0; i < 100; i++) {
            a[i] = i + 1;
            System.out.println(a[i]);
        }
    }

}

 

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。

import java.util.Scanner;
import java.util.Random;

public class TestHello {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        double a[] = new double[10];
        double sum = 0;
        Scanner input = new Scanner(System.in);
        for (int i = 0; i < a.length; i++) {
            System.out.println("输入第" + (i + 1) + "个学生成绩");
            a[i] = input.nextInt();
        }
        for (int i = 0; i < a.length; i++) {
            sum = a[i] + 5;
            if (sum >= 100) {
                System.out.println("加分后成绩为100分");
            } else {
                System.out.println("加分后成绩为" + sum + "分");
            }
        }
    }

}

 

posted @ 2021-04-19 16:15  于泓旭  阅读(49)  评论(0编辑  收藏  举报