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EXAMPLE 6.13 Constant Pointers, Pointer Constants, and Constant Pointer Constants This fragment declares four variables: a pointer p, a constant pointer cp, a pointer pc to a constant, and a constant pointer cpc to a constant: int * p; // a pointer to an int // ok: increments int *p ++(*P); // ok: increments pointer p ++p; int * const cp; // a constant pointer to an int // ok: increments int *cp ++ ("cp) ; ++cp; // illegal: pointer cp is constant const int * pc; // a pointer to a constant int // illegal: int *pc is constant .++ (*PC> ; ++pc; // ok: increments pointer pc const int * const cpc; // a constant pointer to a constant int ++(*cpc>; // illegal: int *cpc is constant ++cpc; // illegal: pointer cpc is constant

The basic approach in an object-oriented (OO) methodology is to develop an object model (see Section 2.4) that describes that subset of the real world that is the problem domain. The purpose is modeling the problem domain and not designing an implementation. Thus, entities that are essential to understanding the problem will be included even if they are not going to be included in the solution. The attributes and methods included in the object model will also be those needed for understanding the problem and not those that will just be important for the solution. The following are rules for object models for requirements: 1. All real-world entities that are important to understanding the problem domain must be included. 2. All methods and attributes that are important to understanding the problem domain must be included. 3. Objects, attributes, and methods that are only signi cant for the implementation should not be included.

Note that the reference operator * may be used in a declaration with or without a space on either side. Thus, the following three declarations are equivalent:

int* p; int * p; int *p; // indicates that p has type int* (pointer to int) // style sometimes used for clarity // old C style

6.12 ARRAYS OF POINTERS AND POINTERS TO ARRAYS The elements of an array may be pointers. Here is an array of 4 pointers to type double:

double* p[4];

Draw an object model for the library problem (see Example 2.6). See Fig. 8-1.

Its elements can allocated like any other pointer: pm = new double(3.141592653589793); We can visualize this array like this:

The next example illustrates a useful application of pointer arrays. It shows how to sort a list indirectly by changing the pointers to the elements instead of moving the elements themselves. This is equivalent to the Indirect Bubble Sort shown in Problem 5.12.

EXAMPLE 6.14 Indirect Bubble Sort // The Indirect Bubble Sor t sorts void sort(float* p[], int n the pointer array:

float* temp; for (int i = 1; i c n; i++) for (int j = 0; j < n-i; j++)

Fig. 8-1.

if (*p[jl > *p[j+ll) {

Placing the 0s or 1s in position (from h at left) yields 11101101, which is the binary value for 237 decimal. Let s look at another example, this time for decimal 122. 122/128 = 0 122/64 = 1 58/32 = 1 26/16 = 1 10/8 = 1 2/4 = 0 2/2 = 1 (h) (g) (f) (e) (d) (c) (b) then then then then 122 64 = 58 58 32 = 26 26 16 = 10 10 8 = 2

temp = PM; PC1 = p[j+ll; PC+11 = temp;

On each iteration of the inner loop, if the floats of adjacent pointers are out of order, then the pointers are swapped. 6.13 POINTERS TO POINTERS

A pointer may point to another pointer. For example,

Draw an object model for simplified vi-like editor. See Fig. 8-2.

char c = 't'; char* pc = &c; char** ppc = &PC; // changes the value of c to 'WI char*** pppc = &ppc; ***pppc = w ; I

We can visualize these variables like this:

The assignment * **pppc = I w I refers to the contents of the address by the address ppc that is pointed to by the address pppc. 6.14 POINTERS TO FUNCTIONS

Like an array name, a function name is actually a constant pointer. We can think of its value as the address of the code that implements the function. A pointer to a function is simply a pointer whose value is the address of the function name. Since that name is itself a pointer, a pointer to a function is just a pointer to a constant pointer. For example,

Fig. 8-2.