C ++ - * p vs& p vs p [英] C++ - *p vs &p vs p
问题描述
我仍然很难理解* p，& p和p之间的区别。从我的理解，*可以被认为是价值指向，&作为地址。换句话说，*保存值，而&持有地址。如果这是真的，那么* p和p之间的区别是什么？ p <$ p
I am still struggling to understand the difference between *p, &p, and p. From my understanding, * can be thought of "value pointed by", and & as "adress of". In other words, * holds the value while & holds the adress. If this is true, then what is the distinction between *p and p? Doesn't p hold the value of something, just like *p?
推荐答案
* 运算符用于间接。间接表示 p 中的值被解释为内存地址，并加载该地址处的值。 p 是 p 的值，而 * p 值存储在 p 指向的存储器位置。当你想间接访问整数 i 的值时，你可以有一个指向它的整数指针（ int * p =& i ）并使用该指针间接修改 i 的值（ * p = 10 ） 。
The * operator is used for indirection. Indirection means the value in p is interpreted as a memory address and the value at that address is loaded. p is the value of p while *p is the value stored in the memory location pointed by p. When you want to indirectly access the value of an integer i, you can have an integer pointer point to it (int *p = &i) and use that pointer to modify the value of i indirectly (*p = 10).
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