int[] array = {  112  ,114  ,118  ,123  ,132  ,135  ,146  ,155  ,162  ,165  };

System.out.print("请输入待查找元素：  ");

int low = 0, suo = 0, high = array.length-1 ;

Scanner scanner = new Scanner(System.in);

int x = scanner.nextInt();

while (low <= high) {

suo = (low + high) / 2;

if (array[suo] < x)

low = suo + 1;

else

high = suo - 1;

if (array[suo] == x) {

System.out.println("此元素在数组中的索引为：：" + suo);

}

}上面是源代码，我发现将high = array.length-1 ;改为high=array.length也可以运行，那么两者有什么具体区别？此外，如果将int low = 0, suo = 0, high = array.length-1 ;改为int low = 1, suo = 0, high = array.length ;除了不能输出第一个元素的索引外，其余都能输出，那么为什么不能输出第一个元素的索引呢？