c - 分配一个指向整数的指针

Question

我可以将指针分配给整型变量吗？像下面这样。

int *pointer;
int array1[25];
int addressOfArray;

pointer = &array1[0];

addressOfArray = pointer;

这样可以吗？

Answer 1

并非没有显式转换，即

addressOfArray = (int) pointer;

还有这个警告:

6.3.2.3 Pointers
...
6 Any pointer type may be converted to an integer type. Except as previously specified, the result is implementation-defined. If the result cannot be represented in the integer type, the behavior is undefined. The result need not be in the range of values of any integer type.

因此不能保证结果是有意义的整数值。