#include<stdio.h>

int fu(int a[],int n)

{

int left,right,mid;

left=0;right=9;

while(left<=right)

{

mid=(left+right)/2;

if(a[mid]>n)

right=mid-1;

else

if(a[mid]<n)

left=mid+1;

else

printf("%d",mid);

}

printf("-1");

}

main()

{

int a[10]={3,5,9,4,1,5,55,33,44,88},n;

printf("输入要找的数字:");

scanf("%d",&n);

fu(a,n);

}