C++ Primer Plus

Declaring and Initializing Pointers

Let’s examine the process of declaring pointers. A computer needs to keep track of the type of value to which a pointer refers. For example, the address of a char typically looks the same as the address of a double, but char and double use different numbers of bytes and different internal formats for storing values. Therefore, a pointer declaration must specify what type of data to which the pointer points.

For example, the preceding example has this declaration:

int * p_updates;

This states that the combination * p_updates is type int. Because you use the * operator by applying it to a pointer, the p_updates variable itself must be a pointer. We say that p_updates points to type int. We also say that the type ...