JAVA第七次作业

上机练习

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 mt.box;

public class mt1 {

    /**
     * @param args
     */
    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 mt.box;

import java.util.Scanner;

public class mt2 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a[]=new int[5];
        Scanner input=new Scanner(System.in);
        System.out.println("输入五个数");
        for (int i = 0; i < a.length; i++) {
            a[i]=input.nextInt();
        }
        System.out.println(" ");
        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 mt.box;

public class mt3 {

    /**
     * @param args
     */
    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 mt.box;

import java.util.Scanner;

public class mt4 {

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

        }
        System.out.println("总分为"+sum);
        System.out.println("平均分为"+sum/5);
        
    

    }

}

 

 

 

 

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

package mt.box;

public class mt5 {

    /**
     * @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]);
        }
        System.out.println("  ");
        for (int i : a) {
            System.out.println(i);
            
        }
        System.out.println("倒序输出");
        for (int i = a.length-1; i >=0; i--) {
            System.out.println(a[i]);
        }

    }

}

 

 

 

 

作业:
1.定义一个整型数组,赋值后求出奇数个数和偶数个数

package mtbox;

public class zuoye7 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] array = {0, 1, 2, 3, 4, 5};
        int odd = 0;
        int even = 0;
        for (int n : array) {
            if (n % 2 != 0) {
                odd++;
            }
            else {
                even++;
            }
        }
        System.out.println(odd);
        System.out.println(even);
    }


}

 

 

 

2.生成一个100长度数组,里面的数分别是1-100,并输出

 

package mtbox;

public class zuoye7 {

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

 

 

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 mtbox;

public class zuoye7 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        double[] grades = {70, 60, 25, 65, 100, 25, 70, 20, 100};
        for (int n = 0; n < grades.length; n++) {
            double grade = grades[n] + 5;
            if (grade > 100) {
                grade = 100;
            }
            grades[n] = grade;
        }
        
        for (double grade : grades) {
            System.out.println(grade);
        }
    }

}

 

 

posted @ 2021-04-20 13:37  起个名真难a  阅读(53)  评论(0编辑  收藏  举报