判断是否没找到条件不对，改一下：

#include

int fun(int a[], int m, int n, int p)

{

int mid;

if (m > n)return -1;

mid = (m + n) / 2;

if (a[mid] == p)

return mid;

else if (a[mid]

{

return fun(a, mid + 1, n, p);

}

else if (a[mid]>p)

{

//m = m - m / 2;

return fun(a, m, mid - 1, p);

}

//else if (((mid == m) & a[m] != p) || ((mid + 1) == n) & a[n] != p)

// return -1;

}

void main()

{

int p;

int array[10] = { 1, 2, 5, 10, 17, 26, 37, 50, 65, 82 };

scanf(＂%d＂, &p);

printf(＂%d＂, fun(array, 0, 9, p));

}