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The derived types are also known as structured types. These types are used as ele-
ments in creating more complex user-defined types.
Arrays
Array is the simplest and most commonly used structured type. Variable of array
type is actually an array of objects of the same type. These objects represent ele-
ments of an array and are identified by their position in array. An array consists of
a contiguous region of storage exactly large enough to hold all of its elements.
Array Declaration
Array declaration is similar to variable declaration, with the brackets added after
identifer:
type array_name
[
constant-expression
]
This declares an array named as
array_name
composed of elements of
type
.
The
type
can be scalar type (except void), user-defined type, pointer, enumera-
tion, or another array. Result of the
constant-expression
within the brackets
determines the number of elements in array. If an expression is given in an array
declarator, it must evaluate to a positive constant integer. The value is the number
of elements in the array.
Each of the elements of an array is numbered from 0 through the number of ele-
ments minus one. If the number is
n, elements of array can be approached as
variables
array_name
[0] ..
array_name
[n-1] of
type
.
Here are a few examples of array declaration:
#define MAX = 50
int vector_one[10];
/* an array of 10 integers */
float vector_two[MAX];
/* an array of 50 floats */
float vector_three[MAX - 20];
/* an array of 30 floats */
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DERIVED TYPES