c++ - 我需要为初始化的指针分配内存吗？

Question

int a = 10;    
int *p = &a; 

*p = 20;  /* Is this a valid statement? */

我知道如果我执行 int *p; 然后如果我执行 *p = 10 ，它是无效的，因为我没有分配任何内存给 p。但是，我想知道初始化指向某个地址的指针是否会为该指针分配内存？

Answer 1

I was wondering if initializing a pointer to some address allocates memory to it or not?

它不分配任何内存。因为 p a 指向一个已经分配的内存

int a = 10;    // a is statically allocated and value 10 is assigned.
int *p = &a;  // p is pointed to address of a. 
*p = 20;  // at this point p points to that statically allocated memory