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extern int get_size(); // both buf_size and max_files are const const int buf_size = 512, max_files = 20; int staff_size = 27; // ok: const variable char input_buffer[ buf_size ]; // ok: constant expression: 20 - 3 char *fileTable[ max_files - 3 ]; // error: non-const variable double salaries[ staff_size ]; // error: non-const expression int test_scores[ get_size() ];
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Although staff_size is initialized with a literal constant, staff_size itself is a non-const object Access to its value can only be accomplished at run-time, so it is illegal as an array dimension On the other hand, the expression
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max_files - 3
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is a constant expression because max_files is a const variable initialized with a value of 20 This evaluates at compile-time to a value of 17 As we saw in Section 21, the elements of an array are numbered beginning with 0 For an array of ten elements, the correct index values are 0 through 9, not 1 through 10 In the following example, a for loop steps through the ten elements of an array, initializing each to the value of its index:
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int main() { const int array_size = 10; int ia[ array_size ]; for ( int ix = 0; ix < array_size; ++ix ) ia[ ix ] = ix; }
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An array can be explicitly initialized by specifying a comma-separated list of values enclosed in braces For example:
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const int array_size = 3; int ia[ array_size ] = { 0, 1, 2 };
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An explicitly initialized array need not specify a dimension value The compiler will determine the array size by the number of elements listed:
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// an array of dimension 3
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int ia[] = { 0, 1, 2 };
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If the dimension size is specified, the number of elements provided must not exceed that size Otherwise, a compile-time error results If the dimension size is greater than the number of listed elements, the array elements not explicitly initialized are set to 0
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// ia ==> { 0, 1, 2, 0, 0 } const int array_size = 5; int ia[ array_size ] = { 0, 1, 2 };
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A character array can be initialized with either a list of comma-separated character literals enclosed in braces or a string literal Note, however, that the two forms are not equivalent The string constant contains the additional terminating null character For example:
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const char ca1[] = { 'C', '+', '+' }; const char ca2[] = "C++";
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ca1 is of dimension 3; ca2 is of dimension 4 The following declaration will be flagged as an error:
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// error: "Daniel" is 7 elements const char ch3[ 6 ] = "Daniel";
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An array cannot be initialized with another array, nor can one array be assigned to another Additionally, it is not permitted to declare an array of references
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const int array_size = 3; int ix, jx, kx; // ok: array of pointers of type int* int *iap [] = { &ix, &jx, &kx }; // error: array of references not allowed int &iar[] = { ix, jx, kx }; // error: cannot initialize one array with another int ia2[] = ia; // error int main() { int ia3[ array_size ]; // ok // error: cannot assign one array to another ia3 = ia; return 0; }
To copy one array into another, each element must be copied in turn For example:
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file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm
const int array_size = 7; int ia1[] = { 0, 1, 2, 3, 4, 5, 6 }; int main() { int ia2[ array_size ]; for ( int ix = 0; ix < array_size; ++ix ) ia2[ ix ] = ia1[ ix ]; return 0; }
Any expression that results in an integral value can be used to index into an array For example:
int someVal, get_index(); ia2[ get_index() ] = someVal;
Users should be aware, however, that the language provides no compile- or run-time range-checking of the index Nothing stops a programmer from stepping across an array boundary except his or her attention to detail and a thorough testing of his or her code It is not inconceivable for a program to compile and execute and still be fatally wrong