Pass by pointer vs pass by reference is an important distinction in C and C++ that affects whether a function can modify an argument, change what a pointer points to, or simply read an object without copying it. Although the two approaches can produce similar results, they work differently at the language level and offer different advantages depending on whether the function needs a mutable object, an optional value, or permission to redirect a pointer Simple as that..
Understanding the Core Difference
The main difference between passing a pointer and passing a reference lies in what the function receives:
- A pointer parameter receives a copy of the caller’s address.
- A reference parameter acts as an alias for the original object.
When a pointer is passed, the function can modify the object located at that address by dereferencing the pointer. That said, assigning a new address to the pointer parameter itself only changes the local copy. The caller’s pointer variable remains unchanged And that's really what it comes down to. And it works..
When a reference is passed, the function is directly connected to the original object. It can read or modify that object without making the caller pass an address explicitly Surprisingly effective..
This difference becomes especially important when a function needs to update either an object or the pointer variable that identifies the object Simple, but easy to overlook..
How Pass by Pointer Works
In C, all arguments are passed by value. When a pointer is passed to a function, the value of that pointer—the memory address—is copied into the parameter.
Consider the following C example:
#include
void increment_value(int *value)
{
*value += 1;
}
int main(void)
{
int number = 10 