实例3.8

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我是靠谱客的博主殷勤大炮，这篇文章主要介绍实例3.8，现在分享给大家，希望可以做个参考。

import java.util.*;

class Example3_8 {
public static void main(String []args) {
  int n,start,end,middle;
  int a[] = {-2,1,4,5,8,12,17,23,45,56,90,100};
  start = 0;
  end = a.length;
  middle = (start+end)/2;
  int count = 0;
  Scanner reader = new Scanner(System.in);
  System.out.print("请输入一个整数：");
  n = reader.nextInt();
  while(n!=a[middle]) {
   if(n>a[middle]) {
    start = middle;
   }
   else if(n<a[middle]) {
    end = middle;
   }
   middle = (start+end)/2;
   count++;
   if(count>a.length/2)
    break;
  }
  if(count>a.length/2)
   System.out.println(n+"不在数组中");
  else
   System.out.println(n+"是数组中的第"+middle+"个元素");
}
}