2020.10.14日作业

第一题

package com.hp.www;

public class day3 {
    public static void main(String[] args) {
       int[] arr={2,3,4,5,6,7,8,9,10,11};
         //遍历打印
      //  for (int i = 0; i < arr.length; i++) {
      //      System.out.println(arr[i]);}
         //打印最小值
        int max = 0;
        int min = 0;
        max = min = arr[0];
        for (int x = 0; x < arr.length; x++) {
            if (arr[x] > max) {
                max = arr[x];
            }
                if(arr[x]<min){
                min = arr[x];
            }
        }
        System.out.println("最大数是：" + max);
        System.out.println("最小数是：" + min);
        //求数组第二大值
        int shu1=arr[0];
        int shu2=arr[0];
        for (int i = 0; i < args.length; i++) {
            if (arr[i] >shu1) {
                shu2=shu1;
                shu1=arr[i];
            }else if(arr[i]>shu2){
                shu2=arr[i];
            }
        }
        System.out.println("第二个数是："+shu2);
    }

    }

第二题

package com.hp.www;

public class day32 {
    public static void main(String[] args) {
        int[] arr = {8,3,6,9,14,99,55,44,33,21};
        int a=0;
        int mean = 0;
        for (int i = 0; i < arr.length; i++) {
            mean += arr[i];
        }
        a=mean/arr.length;
        System.out.println("平均值" + a);

        int sum1 = 0;
        for (int i = 0; i < arr.length; i++) {
            if(arr[i]>a){
                sum1=arr[i];

            }
        }
        System.out.println(sum1);
    }
    }

第三题

package com.hp.www;

public class day33 {
    public static void main(String[] args) {
        int [] arr={1,2,3,4,11};
        for (int i = 0; i <arr.length ; i++) {
            if (arr[i]<10) {
                System.out.println(arr[i]);
            }else {
                System.out.println("未找到合适的数据");
            }
        }
    }
}

第四题

package com.hp.www;
public class day34 {
    public static void main(String[] args) {
        int[] arr = {8,3,6,9,14,99,55,44,33,21};
        int a=0;
        int mean = 0;
        for (int i = 0; i < arr.length; i++) {
            mean += arr[i];
        }
        a=mean/arr.length;
        System.out.println("平均值" + a);
        int b=0;
        int sum1 = 0;
        for (int i = 0; i < arr.length; i++) {
            if(arr[i]>a){
               sum1++;
               b+=arr[i];
            }
        }
        System.out.println("大于平均数的个数有"+sum1+"个"+"和为"+b);
    }
}

第五题

package com.hp.www;

public class day35 {
    public static void main(String[] args) {
        int[] arr1 = {1,2,3};
        int[] arr2 = {4,5,6};
        int[] arr3=merge(arr1,arr2);
        for (int i = 0; i < arr3.length; i++) {
            System.out.println(arr3[i]);
        }
    }
    public static int[] merge(int[]arr1,int[] arr2){
        int[] a=new int[arr1.length+arr2.length];
        for (int i = 0; i <arr1.length ; i++) {
            a[i]=arr1[i];
        }
        for (int i = 0; i <arr2.length ; i++) {
            a[arr1.length+i]=arr2[i];
        }
    return a;
}}

第六题

package com.hp.www;

public class day36 {
    public static void main(String[] args) {
        int[] arr={171,72,19,16,118,51,210,7,18};
        int a=0;
        for (int i = 0; i <arr.length ; i++) {
            if(arr[i]%10!=7&&arr[i]/10%100!=7&&arr[i]%2==0){
                System.out.println(arr[i]);
                a=arr[i];
            }
            System.out.println("满足要求的元素和是："+a);
        }
    }
}