Java第七次上机作业

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 homework1 {

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

 

import java.util.Scanner;

public class test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入五个数值");
        int[] a = new int[5];
        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

 

public class test {

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

 

 

 

4.输入5个学生成绩，求总分和平均分

 

import java.util.Scanner;

public class test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        double avg = 0;
        double sum = 0;
        double[] a = new double[5];
        System.out.println("请输入五个学生成绩");
        for (int i = 0; i < a.length; i++) {
            a[i] = input.nextDouble();
            sum += a[i];
            avg = sum / 5;
        }
        System.out.println(sum);
        System.out.println(avg);
    }
}

 

 

 

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 test {

    /**
     * @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.print(a[i] + " ");

        }
        System.out.println();
        for (int i : a) {
            System.out.print(i + " ");
        }
        System.out.println();
        for (int j = a.length - 1; j >= 0; j--) {
            System.out.print(a[j] + " ");
        }
    }
} 

 

 

 

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

import java.util.Scanner;

public class test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        int a[] = new int[10];
        int n = 0, m = 0;
        System.out.println("请输入十个数值");
        for (int i = 0; i < a.length; i++) {
            a[i] = input.nextInt();
            if (a[i] % 2 == 0) {
                n++;
            } else {
                m++;
            }
        }
        System.out.println("奇数个数" + m);
        System.out.println("偶数个数" + n);
    }
}

 

 2.定义一个数组，求数组中的最大值和最小值

import java.util.Scanner;

public class test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        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.print(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。

import java.util.Scanner;

public class homework3 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入成绩");
        double[] a = new double[10];
        for (int i = 0; i < a.length; i++) {
            a[i] = input.nextInt();
            if (a[i] < 95) {
                a[i] += 5;
            } else {
                a[i] = 100;
            }
        }
        System.out.println("成绩为");
        for (int i = 0; i < a.length; i++) {
            System.out.println(a[i]);
        }
    }

}