pointers

Question 1

how do you print a pointer

Answer 1

%p

Question 2

how do you reference a variables pointer?

Answer 2

&num1;

Question 3

how do you de-reference a pointer

Answer 3

*pointer;

Question 4

how do you define a pointer

Answer 4

int * numPointer;

Question 5

why use a pointer?

Answer 5

to pass by reference, when you want more permanence. Think about how this affects an array or linked list in java, it gets passed by reference and any changes we make, change the original object we referenced

Question 6

Parameters in functions are passed as what?

Answer 6

The function makes a copy, this is called passing by value

Question 7

What is the advantage of passing by reference

Answer 7

You can go to the actual variable and change it. (It’s not a local copy)

Question 8

How do you code goodSwap( )?

Answer 8

void goodSwap(int *a, int *b){

int temp = *a;

*a = *b;

*b = temp;

}

Question 9

How do you make a pointer constant?

Answer 9

int * const const_ptr;

Question 10

How do you make the data a pointer points to to be constant?

Answer 10

int value;

const int *const_value = &value;

Question 11

How do you make a pointer that is both a const pointer and const value?

Answer 11

int value;

int const * const Ptr= &value;

Question 12

What is memory corruption?

Answer 12

If the pointer passed to free doesn’t point to a heap-allocated block, or if that block has already been freed, bad thing will happen, it will crash if you are lucky, rather than silently corrupting something

Question 13

How do you use free( )?

Answer 13

free will be passed a pointer to an unneeded memory block:

p = mallo(…);

free(p);