Explain addresses in C++ and pointers.
What is the difference between the pointer (*) symbol, the deference operator (&) ?
Include 30 words
An address of a variable defines the location where the variable is stored.
For example :
int a =20;
This means a is a variable which is stored in memory with a value of 20.
To get the address of the variable, we use & operator.
Consider the following segment :
#include <iostream>
using namespace std;
int main() {
int a = 20;
cout << &a;
}
The value which is printed is the address of the variable a. This address which is displayed in the console is a logical address and not physical address. Thus, the logical address is transformed into physical address by operating system using memory management unit ( M.M.U.) and then this physical address in the memory stores the variable a with value 20.
In the above figure, the logical address 0x7ffde192689c is mapped to physical address 1012 of the main memory using MMU.
Difference between (*) symbol and ( & ) operator :
The (*) is called the dereference operator. This is used to return value stored in a particular memory location. In other words, it returns the value that the pointer pointing to a variable is holding.
For example :
int a = 20;
int *p;
p = &a;
cout << *p
This (*) operator will return the value of the variable whose address is stored in pointer p. Thus, *p will give the output 20.
(&) operator is called an address of operator as it stores the address of a variable with a particular value.
In the following segment :
int a = 20;
cout << &a;
&a will give the address of the variable a and it actually tells where in memory the variable a is located with value 20.
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