编辑代码

#include<iostream>
using namespace std;
#include<algorithm>
int Erfen(int a[], int n, int target)
{
 int i = 0, j = n-1, mid = 0;
 while (i <= j)
 {
  mid = (i + j) / 2;
  if (a[mid] == target) return mid;
  else if (a[mid] > target) j = mid-1;
  else if(a[mid] < target)
   i = mid + 1;
 }
 return -1;
}
int main()
{
 int a[10] = {1,2,3,4,5,6,7,8,9};
 cout<<"输入查找数字："; 
 int target ;
 while (cin >> target) {
  int n = 9;
  cout <<"该数字在第"<< Erfen(a, n, target)<<"个"<<endl;
 }
 return 0;
}