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Pointer and Array In C++
Pointer vs Array :
A pointer is a type of variable that keeps as its value the memory address of another variable while an array is defined as the consecutive block of sequence which can store similar type of data.
Basic Definition
Array Example :
In the below program , we print all the elements on the screen.
#include <iostream> using namespace std; int main () { int numbers[5] = { 17, 55, 76, 812, 735 }; cout << "The numbers are: "; for (const int &n:numbers) { cout << n << " "; } cout << "\nThe numbers are: "; for (int i = 0; i < 5; ++i) { cout << numbers[i] << " "; } return 0; }
Output :
The numbers are: 17 55 76 812 735 The numbers are: 17 55 76 812 735
Pointer Example :
#include <iostream> using namespace std; int main() { int var1 = 93; int var2 = 84; int var3 = 67; cout << "Address of var1: "<< &var1 << endl; cout << "Address of var2: " << &var2 << endl; cout << "Address of var3: " << &var3 << endl; }
Output :
Address of var1: 0x7ffdbc9e38ec Address of var2: 0x7ffdbc9e38f0 Address of var3: 0x7ffdbc9e38f4
Pointer vs Array :
Till now, we understand what the array and pointer is. Lets see some basic difference between pointer and array in C++.
Pointers | Arrays |
---|---|
Value stored in the pointer can be changed. | Array is a constant pointer |
Pointer can’t be initialised at definition | Array can be initialised at definition. |
Used to allocate static memory | Used to allocate dynamic memory |
Increment is valid in pointer e.g, ptr++; | Increment is invalid in array e.g, a++; |
Example :
In the below program, we access the elements of array using pointers.
#include <iostream> using namespace std; int main () { int arr[6] = { 21, 33, 65, 87, 59, 82 }; printf ("Elements of array : "); for (int i = 0; i < 6; ++i) { printf ("%d ", *(arr + i)); } return 0; }
Output :
Elements of array : 21 33 65 87 59 82
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