To operate with the variable, you can also access it by dereferencing the variable's pointer. For example, you can change the value of the variable by using pointers:

int b = 1;
int *pb = &b;

*pb = *pb + 2;  // b = 1 + 2
b = 3 + *pb;   // b = 3 + 3
cout << b << endl;

In all the statements above, we added numbers to the value of `b` and assigned the result to the variable `b`.

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Dereferencing

Decrease x by 3 using pointers.