2.5: Pointer Arithmatic
- Page ID
- 34650
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Pointer Expressions and Pointer Arithmetic
A limited set of arithmetic operations can be performed on pointers which are:
- incremented ( ++ )
- decremented ( — )
- an integer may be added to a pointer ( + or += )
- an integer may be subtracted from a pointer ( – or -= )
- difference between two pointers (p1-p2)
(Note: Pointer arithmetic is meaningless unless performed on an array.)
// C++ program to illustrate Pointer Arithmetic in C++ #include <iostream> using namespace std; int main() { //Declare an array int v[3] = {10, 100, 200}; //declare pointer variable int *ptr; //Assign the address of v[0] to ptr ptr = v; for (int i = 0; i < 3; i++) { cout << "Value at ptr = " << ptr << "\n"; cout << "Value at *ptr = " << *ptr << "\n"; // Increment pointer ptr by 1 ptr++; } return 0; }
Output:
Value at ptr = 0x7fff9a9e7920
Value at *ptr = 10
Value at ptr = 0x7fff9a9e7924
Value at *ptr = 100
Value at ptr = 0x7fff9a9e7928
Value at *ptr = 200
Adapted from:
"Pointers in C/C++ with Examples" by Abhirav Kariya, Geeks for Geeks is licensed under CC BY 4.0