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Pointer operators
- The &, or address operator, is a unary operator that
returns the address of its operand.
Example:
char x = 'A', z = 'B';
int y = 32;
int *xPtr;
...
xPtr = &x;
cout << *xPtr; // displays 'A'
xPtr = &z; // assigns address of x variable to xPtr pointer
cout << *xPtr; // displays 'B'
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- The *, or indirection/dereferencing operator, returns
a synonym, alias, or nickname for the object to which its
pointer points. Valid for basic data types.
Example:
char x = 'A', z = 'B';
int y = 32;
int *xPtr = &x;
...
xPtr = &x; // assigns address of x variable to xPtr pointer
cout << *xPtr; // displays 'A'
*xPtr = 'C' // indirectly assigns 'C' to variable x
cout << *xPtr; // displays 'C'
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- The -> is used for structures and union members.
Example:
struct Time{
int second;
int minute;
int hour;
};
...
Time breakTime, *goodTime;
goodTime = &breakTime;
goodTime->hour = 3;
cout <<breakTime.hour // displays 3
<<goodTime->hour; // also displays 3
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