Array In
C++
Array:
An Array is a collection of same type elements in contiguous memory location that can be access by using index of array. Arrays are used to store the data of same datatype. There are arrays of integer, char, double, float, and even of bool. And the most important thing that need to be remember, indexing in C++ is always start from 0.
Syntax:
Datatype arrayName [arraySize];
Array of Integers:
| Addresses | 0x2600 | 0x2604 | 0x2608 | 0x260c | 0x2610 | 0x2614 | 0x2618 | 0x261c | 0x2620 |
| Values | 40 | 99 | 61 | 10 | 36 | 12 | 2 | 6 | 52 |
| INDICES | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
The first row shows the address of Array and the second row show the values stored the array. And the last row shows the indexing of array. The size of array is 9. In C++ the index of first element of any array is always 0.
Array of Integers:
| Addresses | 0x2600 | 0x2604 | 0x2608 | 0x260c | 0x2610 | 0x2614 | 0x2618 | 0x261c | 0x2620 |
| Values | 40 | 99 | 61 | 10 | 36 | 12 | 2 | 6 | 52 |
| INDICES | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
The first row shows the address of Array and the second row show the values stored the array. And the last row shows the indexing of array. The size of array is 9.
Array of Char:
| Addresses | 0x1111 | 0x1112 | 0x1113 | 0x1114 | 0x1115 | 0x1116 | 0x1117 | 0x1118 | 0x1119 |
| Values | P | R | o | T | e | a | C | h | \0 |
| INDICES | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
In case of character array, compiler add the null in end of array automatically, because the delimiter of char array is null. It’s a convention, the end of the strings in character sequence there is a null. If we make an array of 9 elements of char datatype and store only 3 char elements in it than there is null at third index of array and on remaining indices there is garbage value.
| Addresses | 0x1111 | 0x1112 | 0x1113 | 0x1114 | 0x1115 | 0x1116 | 0x1117 | 0x1118 | 0x1119 |
| Values | P | R | o | \0 | garbage | garbage | garbage | garbage | Garbage |
| INDICES | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 9 |
Example1:
Output:
Example2:
Output:
Example3:
Output:
Example4:
Output:
