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.

package apex;
public class apex {

    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。

 

package apex;
public class apex {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] a = new int[5];
        a[0] = 1;
        a[1] = 2;
        a[2] = 3;
        a[3] = 4;
        a[4] = 4;
        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 apex;
public class apex {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        char[] a ={'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 apex;
import java.util.Scanner;
public class apex {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] a = new int[5];
        Scanner sc = new Scanner(System.in);
        for (int i = 0; i < a.length; i++) {
            System.out.println("请输入第" + (i + 1) + "学生成绩");
            a[i] = sc.nextInt();
        }
        System.out.println("总分");
        int sum = 0;
        for (int j = 0; j < a.length; j++) {
            sum += a[j];
        }
        System.out.println(sum);
        System.out.println("平均分");
        double x = sum / 5;
        System.out.println(x);
    }
}

 

 

 

 

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

 

package apex;
import java.util.Scanner;
public class apex {

    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]);
        System.out.println();
        for (int i = a.length-1; i >=0; i--) 
            System.out.println(a[i]);
    }
}

 

 

 

 6. 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 apex;
import java.util.Scanner;
public class apex {

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

 

 

 

 

7. 生成一个100长度数组，里面的数分别是1-100，并输出

package apex;
import java.util.Scanner;
public class apex {

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

import java.util.Scanner;

public class apex {

 

    public static void main(String[] args) {

        // TODO Auto-generated method stub

        Scanner input = new Scanner(System.in);

        System.out.println("请输入10位学生成绩");

        double[] a = new double[10];

        for (int x = 0; x < a.length; x++) {

            a[x] = input.nextDouble();

        }

        for (int x = 0; x < a.length; x++) {

            a[x] = a[x] + 5;

            if (a[x] > 100) {

                a[x] = 100;

            }

        }

        System.out.println("加5分后");

        for (int x = 0; x < a.length; x++) {

            System.out.print(a[x] + " ");

        }

    }

}