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A pointer is a memory address. Working with pointers requires drawing pointer diagrams. Do not try to keep pointer diagrams in your head.
| &x | The address of x. |
| *p | The variable that p points to. |
| *(&x) | The same as x. |
| p = q | Make p point to the place where q points. |
| *p = *q | Copy the value of the variable that q points to into the variable that p points to. |
| T *p; | p has type T* if and only if *p has type T. |
| type of &x | If x has type T then &x has type T*. |
Declaration
const double* q = ptr;
means that you cannot use q to change
what is stored in variable *q.
But you can change the memory address
that is stored in q.
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