Pointers and Strings: Part Two

Last time we started an important topic in C++, pointers. Today, we shall continue from that.

Using 'const' with Pointers

•          const qualifier

–        Value of variable should not be modified

–        const used when function does not need to change a variable

•          Principle of least privilege

–        Award function enough access to accomplish task, but no more

•          Four ways to pass pointer to function

–        Nonconstant pointer to nonconstant data

•          Highest amount of access

–        Nonconstant pointer to constant data

–        Constant pointer to nonconstant data

–        Constant pointer to constant data

•          Least amount of access

•          const pointers

–        Always point to same memory location

–        Default for array name

                             Must be initialized when declared

'sizeof' Operator

•sizeof

–Unary operator returns size of operand in bytes

–For arrays, sizeof returns

( size of 1 element ) * ( number of elements )

–If sizeof( int ) = 4, then

int myArray[10];

cout << sizeof(myArray);

     will print 40

•sizeof can be used with

–Variable names

–Type names

–Constant values