9.10 二分查找 gcc makefile gdb调试

#include <stdio.h>
#include <stdlib.h>
int find1(int *a, int low , int high , int key)//迭代二分查找
{
        int mid = 0;
        while (low <= high)
        {
                mid = (low+high)/2;
                if (a[mid] == key)
                        return mid;
                else if (a[mid] < key)
                        low = mid + 1;
                else
                        high = mid -1;
        }
        return -1;
}
int find2(int *a, int low , int high , int key) //递归二分查找
{
        if (low > high)
                return -1;
        int mid = (low+high)/2;
        if (a[mid] == key)
                return mid;
        else if (a[mid] < key)
                find1(a,mid+1,high,key);
        else
                find1(a,low,mid-1,key);
}
int main()
{
        int array[13] = {2,6,8,12,32,64,67,78,98,104,120,134,140};
        int key = find2(array,0,12,140);
        printf("%d\n",array[key]);
        return 0;
}