#include<stdio.h>
#define N 10

int fun(int a[],int m)
{
    int low=0,high=N-1,mid;
    {
        while(low<=high)
            mid=(low+high)/2;
        if(m<a[mid])
            high=mid-1;
        else if(m>a[mid])
            low=mid+1;
        else
            return (mid);
    }
    return (-1);
}
main()
{
    int i,a[N]={1,2,3,4,5,6,7,8,9,10},k,m;
    printf("\nPlease enter arrye:\n");
    for(i=0;i<N;i++)
        scanf("%d",&a[i]);
    printf("enter m\n");
    scanf("%d",&m);
    k=fun(a,m);
    if(k>=0)
        printf("m=%d,index=%d\n",m,k);
    else
        printf("not be fount");
}

呵呵..太大意了.一不小心.把循环体搞错了..