Array Of Pointers
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The document discusses arrays, pointers, and arrays of pointers in C programming. It defines an array as a collection of homogeneous data items stored contiguously in memory that is declared using a data type, variable name, and size. It also provides the syntax for declaring and accessing array elements. The document then defines a pointer as a variable that stores the address of another variable and gives the syntax for declaring pointer variables. Finally, it defines an array of pointers as a linear sequence of memory locations that each represent a pointer and shows the syntax for declaring an array of pointers.
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![A collection of homogeneous data items that are stored at
contiguous memory locations.
Syntax of declaring ArrayVariable:-
data_type variable_name [size]
Example:- float s_height[40];
Syntax of accessing array elements:-
variable_name [index]
Example:- s_height[3]=5.4;
sum=sum+s_height[3];](https://image.slidesharecdn.com/cpresentation-171119073413/85/Array-Of-Pointers-2-320.jpg)
![Array Of Pointers is a linear consecutive sequence of
memory locations each of which represents a pointer.
We can assign pointers as an Array Of Pointer with the
following syntax-
data_type *pointer_name[size]
Example:- int*ptr[10];
Here, ptr refers to an array of 10 pointers.](https://image.slidesharecdn.com/cpresentation-171119073413/85/Array-Of-Pointers-4-320.jpg)
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end notes.
Solution
Array is a collection of variables of the same type that are referenced by a common name.
Specific elements or variables in the array are accessed by means of index into the array.
If taking about C, In C all arrays consist of contiguous memory locations. The lowest address
corresponds to the first element in the array while the largest address corresponds to the last
element in the array.
C supports both single and multi-dimensional arrays.
1) Single Dimension Arrays:-
Syntax:- type var_name[size];
where type is the type of each element in the array, var_name is any valid identifier, and size is
the number of elements in the array which has to be a constant value.
*Array always use zero as index to first element.
The valid indices for array above are 0 .. 4, i.e. 0 .. number of elements - 1
For Example :- To load an array with values 0 .. 99
int x[100] ;
int i ;
for ( i = 0; i < 100; i++ )
x[i] = i ;
To determine to size of an array at run time the sizeof operator is used. This returns the size in
bytes of its argument. The name of the array is given as the operand
size_of_array = sizeof ( array_name ) ;
2) Initialisg array:-
Arrays can be initialised at time of declaration in the following manner.
type array[ size ] = { value list };
For Example :-
int i[5] = {1, 2, 3, 4, 5 } ;
i[0] = 1, i[1] = 2, etc.
The size specification in the declaration may be omitted which causes the compiler to count the
number of elements in the value list and allocate appropriate storage.
For Example :- int i[ ] = { 1, 2, 3, 4, 5 } ;
3) Multidimensional array:-
Multidimensional arrays of any dimension are possible in C but in practice only two or three
dimensional arrays are workable. The most common multidimensional array is a two
dimensional array for example the computer display, board games, a mathematical matrix etc.
Syntax :type name [ rows ] [ columns ] ;
For Example :- 2D array of dimension 2 X 3.
int d[ 2 ] [ 3 ] ;
A two dimensional array is actually an array of arrays, in the above case an array of two integer
arrays (the rows) each with three elements, and is stored row-wise in memory.
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Array Of Pointers
- 1. Submitted By- Sharad Dubey Submitted To- Prof. Nitin Paharia Sir
- 2. A collection of homogeneous data items that are stored at contiguous memory locations. Syntax of declaring ArrayVariable:- data_type variable_name [size] Example:- float s_height[40]; Syntax of accessing array elements:- variable_name [index] Example:- s_height[3]=5.4; sum=sum+s_height[3];
- 3. A pointer is a variable that can hold the address of another variable. Syntax of declaring pointer variable:- data_type*variable_name Example:- int*a ; char*a ; Where,* is used to denote that a is pointer variable and not a normal variable.
- 4. Array Of Pointers is a linear consecutive sequence of memory locations each of which represents a pointer. We can assign pointers as an Array Of Pointer with the following syntax- data_type *pointer_name[size] Example:- int*ptr[10]; Here, ptr refers to an array of 10 pointers.
- 5. Output:-