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Review of Pointers A pointer is a memory address. The following declarations define x to be a float containing the value 44.44 and p to be a pointer containing the address of x: float x = 44.44; float* p = &x;
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This shows two rectangles, one labeled p and one labeled x. The rectangles represent storage locations in memory. The variable p points to the variable x. We can access x through the pointer p by means of the dereference operator * The statement *p = 77.77; changes the value of x to 77.77.
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We can also have several pointers referencing the same object. Now *p, *q, and x are all names for the same object whose current value is 77.77.
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If p is a pointer, then the call cout <<*p will always print the value of the object to which p points, and the call cout << p will usually print the value of the address that is stored in p. The important exception to this second rule is when p is declared to have type char*. Strings A C++ string is a character array with the following features:
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A NUL character '\0' is appended to the end of the array. This means that the number of characters in the array is always 1 more than the string length. The string may be initialized with a string literal like this: char str[] = "Bethany"; Note that this array has 8 elements: 'B', 'e', 't', 'h', 'a', 'n', 'y', '\0'. The entire string may be output as a single object, like this: cout << str; The system will copy characters from str to cout until the NUL character '\ 0' is encountered. The entire string may be input as a single object, like this: cin >> buffer; The system copies characters into buffer from cin until white space is encountered. The user must ensure that buffer is defined long enough to hold the input. The functions declared in <string.h> may be used to manipulate strings. These include the string length function strlen(), the string copying functions strcpy() and strncpy(), the string concatenating functions strcat() and strncat(), the string comparing functions strcmp()and strncmp(), and the token extracting function strtok().
String I/O Input and output of strings are done in several ways in C++ programs. The best way is by means of string class operators as described in 10. Since straightforward methods are useful to understanding how strings are represented and manipulated we describe these techniques in this chapter. Example 7.1 Ordinary Input and Output of Strings This fragment reads words into a 79-character buffer: char word[80]; do cin >>word; cout <<endl;
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if (*word) cout <<"\" " <<word <<"\"\n"; } while (*word); In this run, the while loop iterated 7 times: once for each word entered (including the Ctrl-Z that stopped the loop). Each word in the input stream cin is echoed to the output stream cout. The output stream is not "flushed" until the input stream encounters the end of line. Each string is printed with a double quotation mark on each side. This character must be designated by the character ' \" '. The expression *word controls the loop. It is the initial character in the string. It will be nonzero as long as the string word contains a string of length greater than 0. The string of length 0 (the empty or NUL string) contains a NUL ('\0' ) as its first element. Pressing Ctrl-Z sends the end-of-file character in from cin. This loads the NUL string into word, setting *word (word[0]) to NUL and stopping the loop.
Note that punctuation marks (commas, periods, etc.) are included in the strings, but white space (blanks, tabs, newlines, etc.) is not.
The do loop in Ex. 7.1 could be replaced with: cin >> word while (*word) { cout <<"\"" <<word <<"\"\n"; cin >> word; } When Ctrl-Z is pressed, the cin call assigns the empty string to word. Example 7.1 illustrates that the output operator << behaves differently with pointers of type char* than with other pointer types. With a char* pointer, << outputs the character string to which the pointer points. With any other pointer type << will output the pointer address. Some cin Member Functions The input stream object cin includes the input functions: getline, get, ignore, putback, and peek. Each of these functions is prefaced
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