variable vs pointer
Variable is used to store value
Pointer is used to store addresss of valuevariable vs pointer
Variable is used to store value
Pointer is used to store addresss of valuedifference between pointer and reference
//Passing by Pointer://
// C++ program to swap two numbers using
// pass by pointer.
#include <iostream>
using namespace std;
void swap(int* x, int* y)
{
int z = *x;
*x = *y;
*y = z;
}
int main()
{
int a = 45, b = 35;
cout << "Before Swapn";
cout << "a = " << a << " b = " << b << "n";
swap(&a, &b);
cout << "After Swap with pass by pointern";
cout << "a = " << a << " b = " << b << "n";
}
o/p:
Before Swap
a = 45 b = 35
After Swap with pass by pointer
a = 35 b = 45
//Passing by Reference://
// C++ program to swap two numbers using
// pass by reference.
#include <iostream>
using namespace std;
void swap(int& x, int& y)
{
int z = x;
x = y;
y = z;
}
int main()
{
int a = 45, b = 35;
cout << "Before Swapn";
cout << "a = " << a << " b = " << b << "n";
swap(a, b);
cout << "After Swap with pass by referencen";
cout << "a = " << a << " b = " << b << "n";
}
o/p:
Before Swap
a = 45 b = 35
After Swap with pass by reference
a = 35 b = 45
//Difference in Reference variable and pointer variable//
References are generally implemented using pointers. A reference is same object, just with a different name and reference must refer to an object. Since references can’t be NULL, they are safer to use.
A pointer can be re-assigned while reference cannot, and must be assigned at initialization only.
Pointer can be assigned NULL directly, whereas reference cannot.
Pointers can iterate over an array, we can use ++ to go to the next item that a pointer is pointing to.
A pointer is a variable that holds a memory address. A reference has the same memory address as the item it references.
A pointer to a class/struct uses ‘->'(arrow operator) to access it’s members whereas a reference uses a ‘.'(dot operator)
A pointer needs to be dereferenced with * to access the memory location it points to, whereas a reference can be used directly.Copyright © 2021 Codeinu
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