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In each case, the object is initialized to the number zero. In the case of type char, the character c becomes the null character; denoted by I\ o I or NUL, it.is the character whose ASCII code is 0. 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:

char* pc = 0; short* pd = 0; int* pn = 0; unsigned* pu = 0; float* px = 0; double* pz = 0; // // // // // // initializes initializes initializes initializes initializes initializes pc pd pn pu px pz to to to to to to NULL NULL

pointer cannot be dereferenced. This is a common but fatal error:

int* p = 0; *p = 22;

Fig. 8-4.

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:

2,064,512

// ERROR: no object can have type void // 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; void x; void* p;

This use is most common in low-level C programs designed to manipulate hardware resources. Review Questions

61 . 6.2 6.3

The essential functions in this diagram are file manipulation (create, save, and open). Insert and modify are intended as higher-level phrases covering the typical text-editing functions. Note that some capabilities such as search, copy, and move may be neglected, since they are not mentioned explicitly.

How do you access the memory address of a variable How do you access the contents of the memory location whose address is stored in a pointer variable Explain the difference between the following two uses of the reference operator SC:

int& r = n; p = &n;

Exnlain the difference between the following two uses of the indirection operator *:

int* q = p; n = *p;

A scenario is a sequence of actions that accomplishes a user task. Alternative sequences are only shown by having a separate scenario for each alternative. Scenarios are used to illustrate an important capability or proposed use of the system. In UML, an interaction diagram (see 2) is used to specify the scenarios. Scenarios can also be speci ed by listing the sequence of actions.

65 . 66 . 60 7 6.8

What is a dangling pointer What dire consequences could result from dereferencing a dangling pointer How can these dire consequences b : avoided What is wrong with the following code: int& r = 22; What is wrong with the following code: int* p = &44; What is wrong with the following code: char c = 'w'; char D = &c;

6. 9

6.11 6.12

Write scenarios for the simplified vi editor using each use case in Example 8.4. Use semicolons to separate actions. Use parentheses to contain comments or conditions. Create le vi lename ( le does not already exist) Open le vi lename ( le already exists) Insert text I ; <desired text> ; <esc> i ; <desired text> ; <esc> O ; <desired text> ; <esc> o ; <desired text> ; <esc> A ; <desired text> ; <esc> a ; <desired text> ; <esc> Modify text cw ; <new text> ; <esc> dw dd x Save le ZZ Note: Not all sequences are shown. For the sake of brevity, not all operations are shown. In an actual specification, efforts should be made to show all operations and significant sequences of operations. In this example, each scenario represents only a part of the use. Alternatively, each scenario could run from open file to close file.