Reference and Memory Adress in C++|| C++ Complete Course || Beginners to Advance| Urdu/Hindi | BJM T
A reference variable is a "reference" to an existing variable, and it is created with the & operator:
string food = "Pizza"; // food variable
string &meal = food; // reference to food
Now, we can use either the variable name food or the reference name meal to refer to the food variable:
Example
string food = "Pizza";
string &meal = food;
Memory Address
In the example from the previous page, the & operator was used to create a reference variable. But it can also be used to get the memory address of a variable; which is the location of where the variable is stored on the computer.
When a variable is created in C++, a memory address is assigned to the variable. And when we assign a value to the variable, it is stored in this memory address.
To access it, use the & operator, and the result will represent where the variable is stored:
Example
string food = "Pizza";
cout (( &food; // Outputs 0x6dfed4
And why is it useful to know the memory address?
References and Pointers (which you will learn about in the next chapter) are important in C++, because they give you the ability to manipulate the data in the computer's memory - which can reduce the code and improve the performance.
These two features are one of the things that make C++ stand out from other programming languages, like Python and Java.
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