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This is necessary because the new operator will change the value of a, which is the address of the first element of the newly allocated array. Using const with Pointers A pointer to a constant is different from a constant pointer. This distinction is illustrated in the following example. Example 6.10 const Pointers, etc. 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 n - 44; // an int int* p=&n; // a pointer to an int ++(*p); // increments int *p ++p; // increment pointer p int* const cp=&n; // const pointer to int ++(*cp); // increments int *cp ++cp; // illegal:pointer cp is const const int k=88; // const int const int * pc=&k //,pointer to a const int ++(*pc); // illegal:int *pc is const ++pc; // increments pointer pc const int* const cpc=&k //const pntr to const int ++(*cpc); //illegal:int *cpc is const ++cpc; //illegal:pointer cpc is const 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]; Its elements can be allocated like any other pointer: p [2] =new double (3.14159); 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.
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Example 6.11 Indirect Bubble Sort void sort (float* p [ ], int n) { float* temp; for (int i=l; i < n; i++) for (int j=0; j < n-i; j++) if (*p[j] > *p[j+l]) { temp=p[j]; p[j]=p[j+l]; p[j+l]=temp; } }
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On each iteration of the inner loop, if the floats of adjacent pointers are out of order, then the pointers are swapped. NUL, NULL, and void The constant 0 (zero) has type int. Nevertheless, this symbol can be assigned to all the fundamental types. In each case, the object is initialized to the number 0. In the case of type char, the character c becomes the null character; denoted by ' \ 0' or NUL. The values of pointers are memory addresses. These addresses must remain within that part of memory allocated to the executing process, with the exception of the address 0x0. This is called the NULL pointer. The same constant applies to pointers derived from any type. All of the following initialize the pointers to NULL: char* pc=0; unsigned* pu=0; short* pd=0; float* px=0; int* pn=0; double* pz=0;
The NULL pointer cannot be dereferenced. This is a common fatal error: int* p=0; *p=22; // ERROR: cannot dereference NULL pointer A reasonable precaution is to test a pointer before attempting to dereference it: if (p) *p=22; // ok This tests the condition (p!=NULL) because that condition is true precisely when p is nonzero. The name void denotes a special fundamental type. Unlike all the other fundamental types, void can only be used in a derived type:
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void x; // ERROR: no object can be void void* p; // OK The most common use of the type void is to specify that a function does not return a value: void swap (double&, double&); Another, different use of void is to declare a pointer to an object of unknown type: void* p=q; This use is most common in low-level C programs designed to manipulate hardware resources.
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7 Strings In this chapter: Review of Pointers Strings String I/O Some cin Member Functions Character Functions Defined in <ctype.h> Arrays of Strings The C-String Handling Library A string is a sequence of contiguous characters in memory terminated by the NUL character ' \ 0 '. Strings are accessed by variables of type char* (pointer to char). For example, if s has type char*, then cout << s << endl; will print all the characters stored in memory beginning at the address s and ending with the first occurrence of the NUL character. The C header file <string.h> provides a wealth of special functions for manipulating strings. For example, the call strlen(s) will return the number of characters in the string s, not counting its terminating NUL character. These functions all declare their string parameters as pointers to char. So before we study these string operations, we need to review pointers.
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