int ** understanding
** P int;
int * P, easier to understand, is a pointer to the int type pointer. So here int ** p What is it?
For this particular form, first of all it is certain that p is a pointer, not only because the front p * number * number two and there, so it must be a pointer.
And then the two numbers * What does it mean?
The int ** p broken down into the following form, and int * p comparison, will see more clearly
int * p; //指针p指向 int类型
int * * p;//指针p指向int * 类型
In fact, the difference between the above two forms is that: a pointer to a different type of content, a pointer to a pointer to an int type int *
int a = 10;
int *q;
int **p;
q = &a;//q 指向 a
p =&q; //p 指向q， q是一个int类型指针
After the image memory block has been executed as follows:
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