#include <iostream>  

int init_array(int *array, int n);  
int binary_search(int *array, int n, int key);  

int main()  
{  
	int array[17];  
	int key;  

	init_array(array, 17);  

	std::cout << "请输入要查找的数字(0-16):" << std::endl;  
	std::cin >> key;  
	std::cout << "要查找的数字为:" << array[binary_search(array, 17, key)] << std::endl;  

	return 0;  
}  

int init_array(int *array, int n)  
{  
	for (int i = 0; i < n; ++i)  
	{  
		array[i] = i;  
	}  

	return 0;  
}  

int binary_search(int *array, int n, int key)  
{  
	int low, high, mid;  

	low = 1;  
	high = n;  

	while (low <= high)  
	{  
		mid = low + (high - low) * (key - array[low]) / (array[high] - array[low]);

		if (array[mid] < key)  
		{  
			low = mid + 1;  
		}  
		else if(array[mid] > key)  
		{  
			high = mid - 1;  
		}  
		else  
		{  
			return mid;  
		}  
	}  

	return 0;  
}