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 School.Day8;

public class Test01 {
    public static void main(String[] args){
        int[] x = {10,20,30,40,50};
        for (int i = 0;i<x.length;i++) {
            System.out.println(x[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 School.Day8;
import java.util.Scanner;
public class Test02 {
    public static void main(String[] args){
        Scanner s = new Scanner(System.in);
        int[] x = new int[5];
        for (int i = 0;i<x.length;i++) {
            System.out.print("赋值: ");
            int a = s.nextInt();
            x[i] = a;
        }
        for (int i = 0;i<x.length;i++) {
            System.out.println(x[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 School.Day8;

public class Test03 {
    public static void main(String[] args){
        char[] x = {'C','h','i','n','a'};
        for (int i = 0;i<x.length;i++) {
            System.out.print(x[i] + "  ");
        }
    }
}

　　

4.输入5个学生成绩，求总分和平均分

package School.Day8;
import java.util.Scanner;
public class Test04 {
    public static void main(String[] args){
        int[] x = new int[5];
        int sum = 0;
        Scanner s = new Scanner(System.in);
        for (int i = 0;i<x.length;i++) {
            System.out.print("输入成绩:  ");
            int a = s.nextInt();
            x[i] = a;
        }
        for (int i =0;i<x.length;i++) {
            sum = sum + x[i];
        }
        System.out.println("总和是: " + sum);
        System.out.println("平均是: " + sum / 5.0);
    }
}

　　

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

package School.Day8;

public class Test05 {
    public static void main(String[] args){
        int[] x = {12,53,23,44,53};
        for (int i = 4;i>= 0;i--) {
            System.out.println(x[i]);
        }
        System.out.println("==================");
        int[] y = new int[5];
        for (int i = 0;i<y.length;i++) {
            y[i] = x[4-i];
        }
        for (int i : y) {
            System.out.println(i);
        }
    }
}

　　

6.定义一个整型数组，赋值(动态静态都可以)后求出奇数个数和偶数个数

package School.Day8;
import java.util.Scanner;
public class Test06 {
    public static void main(String[] args){
        int[] x = new int[10];
        int ji = 0;
        int ou = 0;
        Scanner s = new Scanner(System.in);
        for (int i = 0;i<x.length;i++) {
            System.out.print("赋值: ");
            int a = s.nextInt();
            x[i] = a;
        }
        for (int i = 0;i<x.length;i++) {
            if (x[i] % 2 != 0) {
                ji = ji + 1;
            }else{
                ou = ou + 1;
            }
        }
        System.out.println("有奇数: " + ji + "个");
        System.out.println("有偶数: " + ou + "个");
    }
}

　　

7.生成一个100长度数组，里面的数分别是1-100，并输出

package School.Day8;

public class Test07 {
    public static void main(String[] args){
        int[] x = new int[100];
        int y = 0;
        for (int i = 0;i<x.length;i++) {
            y = i + 1;
            System.out.println(y);
        }
    }
}

　　

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 School.Day8;
import java.util.Scanner;
public class Test08 {
    public static void main(String[] args){
        double[] x = new double[10];
        Scanner s = new Scanner(System.in);
        for (int i = 0;i<x.length;i++) {
            System.out.print("输入" + (i+1) +"号学生成绩: ");
            double c = s.nextDouble();
            x[i] = c;
        }
        for (int i = 0;i<x.length;i++) {
            if (x[i] > 95) {
                System.out.println((i+1) + "号学生成绩大于95,不能加分!");
            }else{
                x[i] = x[i] + 5;
            }
        }
        for (int i = 0;i<x.length;i++) {
            System.out.println((i+1) + "号学生加分后成绩为: " + x[i]);
        }
    }
}