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C++ Pointers and References

bookIntroduction to Pointer

A pointer is a variable that stores the memory address of another variable. It allows direct manipulation of memory. Declaration and initialization of a pointer looks like this:

pointer.h

pointer.h

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int* p_Name = nullptr;

  • int: specifies the base type of the variable that the pointer will point to. In this case, it's an integer;

  • *: called dereference operator, returns the value stored at the address held by a pointer;

  • p_Name: the name of the pointer variable. You can choose any valid variable name;

  • nullptr: is a keyword that represents a null pointer, indicating that it is empty and doesn't point to anything.

Note

Commonly, pointers are named with a prefix p_ as a naming convention signifying that the variable is a pointer.

Opgave

Swipe to start coding

  1. Declare and initialize pointer with a nullptr.
  2. Display a pointer for a chosen primitive data type.
  3. Make sure its name has p_ prefix.

Løsning

solution.cpp

solution.cpp

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bookIntroduction to Pointer

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A pointer is a variable that stores the memory address of another variable. It allows direct manipulation of memory. Declaration and initialization of a pointer looks like this:

pointer.h

pointer.h

copy

              
1

            
int* p_Name = nullptr;

  • int: specifies the base type of the variable that the pointer will point to. In this case, it's an integer;

  • *: called dereference operator, returns the value stored at the address held by a pointer;

  • p_Name: the name of the pointer variable. You can choose any valid variable name;

  • nullptr: is a keyword that represents a null pointer, indicating that it is empty and doesn't point to anything.

Note

Commonly, pointers are named with a prefix p_ as a naming convention signifying that the variable is a pointer.

Opgave

Swipe to start coding

  1. Declare and initialize pointer with a nullptr.
  2. Display a pointer for a chosen primitive data type.
  3. Make sure its name has p_ prefix.

Løsning

solution.cpp

solution.cpp

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