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"The value of ival\n" "direct value: " ival "\n" "indirect value: " *pi "\n" "doubly indirect value: " **ppi endl;
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The following two assignment statements behave very differently, although both are legal The first statement increases the value of the data object that pi addresses; the second increases the value of the address that the pointer pi contains
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int i, j, k; int *pi = &i; // add two to i (i = i + 2) *pi = *pi + 2; // add to the address pi contains pi = pi + 2;
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A pointer may have its address value added to or subtracted by an integral value This sort of pointer manipulation, referred to as pointer arithmetic, may at first appear slightly nonintuitive until we realize that the addition is of data objects and not of discrete decimal values The addition of 2 to a pointer increases the value of the address it contains by the size of two objects of its type For example, allowing that a char is 1 byte, an int is 4 bytes, and a double is 8, the addition of 2 to a pointer increases its address value by 2, 8, or 16 depending on whether the pointer is of type char, int, or double In practice, pointer arithmetic is guaranteed to be well behaved only if the pointer addresses an array element In the preceding example, it is not guaranteed that the three integer variables are stored contiguously in memory; ip+2, therefore, may or may not
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file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm
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yield a valid address, depending on what is actually stored at that location The typical idiom for pointer arithmetic is to iterate through an array For example:
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int ia[ 10 ]; int *iter = &ia[0]; int *iter_end = &ia[10]; while ( iter != iter_end ) { do_something_with_value( *iter ); ++iter; // iter now addresses next item }
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Exercise 38
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Given the following definitions
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int ival = 1024, ival2 = 2048; int *pi1 = &ival, *pi2 = &ival2, **pi3 = 0;
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explain what is occurring in the following assignments Identify which, if any, are in error
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(a) (b) (c) (d)
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ival = *pi3; *pi2 = *pi3; ival = pi2; pi2 = *pi1;
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(e) (f) (g) (h)
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pi1 = *pi3; ival = *pi1; pi1 = ival; pi3 = &pi2;
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Exercise 39
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Pointers are an important aspect of C and C++ programming and yet are a common source of program error For example,
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pi = &ival2; pi = pi + 1024;
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is almost guaranteed to leave pi addressing a random area of memory What is the assignment doing, and when would it not be an error
Exercise 310
Similarly, the behavior of the following small program is undefined and likely to fail at run-time:
int foobar( int *pi ) { *pi = 1024; return *pi; }
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file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm
int main() { int *pi2 = 0; int ival = foobar( pi2 ); return 0; }
What is going on here that is a problem How might you fix it
Exercise 311
In the previous two exercises, errors occur because of an absence of run-time checking of the use of a pointer If pointers play such a prominent part in C++ programming, why do you think there is not more safety built into the use of pointers Can you think of any general guidelines for making the use of pointers safer
String Types
C++ provides two string representations: the C-style character string and the string class type introduced with Standard C++ In general we recommend use of the string class, but in practice there are still many program situations in which it is either useful or necessary both to understand and use the older C-style character string One example that we'll see later in 7 is the handling of command line options passed in through main() as an array of C-style character strings