#include     
  int bin_search(int key[],int low, int high,int k)   
  {   
    int mid;   
    if(low>high)
    {
       return -1;   
    }
    else 
     {   
         mid = (low+high) / 2;   
         if(key[mid]==k)   
             return mid;   
         if(k>key[mid])   
             return bin_search(key,mid+1,high,k);        /*在序列的后半部分查找*/   
         else   
             return bin_search(key,low,mid-1,k);            /*在序列的前半部分查找*/   
      }   
 }   

 int main()   
 {   
     int n , i , addr;   
     int A[10] = {2,3,5,7,8,10,12,15,19,21};   
      printf("The contents of the Array A[10] aren");   
      for(i=0;i