遍历元组时
array[SIZE] = {1, 2, 3, 4, 5, 6};
for ( int i = 0; i < SIZE; i++)
或者array[SIZE] = {1, 2, 3, 4, 5, 6, -1}, 其中 -1 是不可能出现的数据
for ( int i = 0; i != -1; i++)
array[SIZE] = {1, 2, 3, 4, 5, 6};
int *p = array[0];
for ( int i = 0; *p != -1; *p++)
while ( *p != -1)
*p++;
