例7-6

#include<stdio.h> int main(void) {     int a[10]={1,2,3,4,5,6,7,8,9,10};  int low,high,mid,n=10,x;

 printf("Enter x: ");  scanf("%d",&x);

 low=0;high=n-1;  while(low<=high)  {   mid=(low+high)/2;   if(x==a[mid])    break;   else if(x<a[mid])    high=mid-1;   else     low=mid+1;  }  if(low<=high)   printf("Index is %d\n",mid);  else   printf("Not Found\n");

 return 0; }