In C++ What are the differences between a pointer variable and a reference variable?

C++Server Side ProgrammingProgramming

References

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

Syntax

Type &newname = existing name;

Initializatio

Type &pointer;
pointer = variable name;

Pointers

Pointers are used to store the address of variable.

Syntax

Type *pointer;

Initialization

Type *pointer;
pointer = variable name;

The main differences between references and pointers 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 but 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.

raja
Published on 02-Apr-2019 09:09:37
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