4.9Java

1.

package hello;

public class yes {
     public static void main(String[] args) {
        int [] arr={10,20,30,40,50};
        for(int i=0;i<5;i++){
            System.out.println(arr[i]);
        }
}
}

2.

package hello;

public class yes {
     public static void main(String[] args) {
          int[] arr = new int[5];
          arr[0]=10;
          arr[1]=20;
          arr[2]=30;
          arr[3]=40;
          arr[4]=50;
          for(int i =0;i<5;i++) {
              System.out.println(arr[i]);
}
}
}

3.

package hello;

public class yes {
     public static void main(String[] args) {
          int[] arr = {23,45,22,33,56};
          double pj = 0;
          int sum =0;
          for(int i =0;i<5;i++) {
              sum+=arr[i];
          }
          System.out.println("sum="+sum+"平均值为"+sum/5);
}
}

4.

package hello;

public class yes {
     public static void main(String[] args) {
          int[] arr = {18,25,7,36,13,2,89,63};
          int max =arr[0];
          int q =0;
          for(int i =1;i) {
              if(max < arr[i]) {
                  max = arr[i];
                  q=i;
              }
          }
          System.out.println("max="+max+"下标"+q);
}
}

 5.

package hello;

public class yes {
     public static void main(String[] args) {
         int[] a= {18,25,7,36,13,2,89,63};
         for(int i=7;i>=0;i--)
         {
           System.out.print("  ");
           System.out.print(a[i]);
         }
}
}

6.

package hello;
import java.util.Scanner;
public class yes {
     public static void main(String[] args) {
         int[] a = { 18,25,7,36,13,2,89,63 };
            System.out.println("原数组的各个元素为：");
            for (int j = 0; j < a.length; j++) {
                System.out.print(a[j] + "\t");
                if (j == a.length - 1) {
                    System.out.println();
                }
            }
            System.out.println("请输入要插入的数：");
            int num = 0;
            Scanner s = new Scanner(System.in);
            num = s.nextInt();
     
            int[] b = new int[a.length + 1];
            if (num <= a[0]) {
                b[0] = num;
                for (int j = 1; j < b.length; j++) {
                    b[j] = a[j - 1];
                }
            } else if (num >= a[a.length - 1]) {
                b[b.length - 1] = num;
                for (int j = 0; j < b.length - 1; j++) {
                    b[j] = a[j];
                }
            } else {
                for (int j = 0; j < a.length - 1; j++) {
                    if (num >= a[j] && num < a[j + 1]) {
                        for (int k = 0; k <= j; k++) {
                            b[k] = a[k];
                        }
                        b[j + 1] = num;
                        for (int m = j + 2; m < b.length; m++) {
                            b[m] = a[m - 1];
                        }
                    }
                }
            }
     
            System.out.println("现在数组各个元素为：");
            for (int i = 0; i < b.length; i++) {
                System.out.print(b[i] + "\t");

                  }
}
}