编辑代码

#include<iostream>
using namespace std;
 
int main() {
	int arr[] = {3,44,38,5,47,15,36,26,27,2,46,4,19,50,48};
	int num = sizeof(arr) / sizeof(arr[0]);
	int target = 50;
	int low = 0;
	int high = num - 1;
	int mid;
	while (low <= high)
	{
		mid= (low + high) / 2;
		if (arr[mid] == target)break;
		else if (arr[mid] > target)
			high = mid - 1;
		else
			low = mid + 1;
	}
	while (arr[mid] ==target)
		mid--;
	mid = mid + 1;
	cout << "Exist！We have arr[" << mid << "]" << "=" << target << endl;
	if(arr[mid]!=target)
		cout << "NULL! " << target << " doesn't exist in the array!\n";
	return 0;
}