What is difference between a pointer and reference parameter in C++?


Pointer variables are used to store the address of variable.


Type *pointer;


Type *pointer;
Pointer=variable name;


When a parameter is declared as reference, it becomes an alternative name for an existing parameter.


Type &newname=existing name;


Type &pointer;
Pointer=variable name;

The main differences between pointers and reference parameters are −

  • References are used to refer an existing variable in another name whereas pointers are used to store address of variable.

  • References cannot have a null value assigned but pointer can.

  • A reference variable can be referenced by pass by value whereas a pointer can be referenced by pass by reference.

  • A reference must be initialized on declaration while it is not necessary in case of pointer.

  • A reference shares the same memory address with the original variable but also takes up some space on the stack whereas a pointer has its own memory address and size on the stack.

Updated on: 30-Jul-2019

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