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Pointers
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the probability of p pointing into something vital Eventually your program stops working The solution to this sort of trouble is obvious: make sure that a pointer is always pointing at something valid before it is used Although the mistake is easy to catch in this simple case, frequently uninitialized pointers (or, incorrectly initialized ones) occur in a way that is not as easy to find A second common error is caused by a simple misunderstanding of how to use a pointer For example, this program is fundamentally wrong
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#include <stdioh> /* This program is wrong */ int main(void) { int x, *p; x = 10; p = x; printf("%d", *p); return 0; }
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THE FOUNDATION OF C++
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The call to printf( ) does not print the value of x, which is 10, on the screen It prints some unknown value because the assignment
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p = x;
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is wrong That statement has assigned the value 10 to the pointer p, which was supposed to contain an address, not a value Fortunately, the error in this program is caught by C++ Builder The compiler issues a warning message that tells you that a nonportable pointer conversion is taking place This is your clue that a pointer error might have been made which is the case in this example To make the program correct, you should write
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p = &x;
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Although C++ Builder reported a warning for the mistake in this program, you can t always count on it for help These types of errors can occur in convoluted, roundabout ways that escape detection So, be careful The fact that pointers can cause very tricky bugs if handled incorrectly is no reason to avoid using them Simply be careful and make sure that you know where each pointer is pointing before using it
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7
Structures, Unions, and User-Defined Types
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Borland C++ Builder: The Complete Reference
he C language gives you five ways to create a custom data type:
1 The structure, which is a grouping of variables under one name and is called a compound data type(The terms aggregate or conglomerate are also commonly used) 2 The bit-field, which is a variation on the structure and allows easy access to individual bits 3 The union, which enables the same piece of memory to be defined as two or more different types of variables 4 The enumeration, which is a list of named integer constants 5 The typedef keyword, which defines a new name for an existing type C++ supports all of these and adds classes, which are described in Part Three The other methods of creating custom data types are described here In C++, structures and unions have both object-oriented and non-object-oriented attributes This chapter discusses only their C-like, non-object-oriented features Their object-oriented qualities are described later in this book
Structures
A structure is a collection of variables that are referenced under one name, providing a convenient means of keeping related information together A structure declaration forms a template that can be used to create structure objects The variables that make up the structure are called members of the structure (Structure members are also commonly referred to as elements or fields) Usually, the members of a structure are logically related For example, the name and address information found in a mailing list is normally represented as a structure The following code fragment declares a structure template that defines the name and address fields of such a structure The keyword struct tells the compiler that a structure is being declared
struct addr { char name[30]; char street[40]; char city[20]; char state[3]; char zip[11]; int customer_num; };
7:
Structures, Unions, and User-Defined Types
The declaration is terminated by a semicolon because a structure declaration is a statement Also, the structure name addr identifies this particular data structure and is its type specifier The structure name is often referred to as its tag At this point, no variable has actually been declared Only the form of the data has been defined To declare a variable with this structure, you would write
struct addr addr_info;
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