1. Example 1 125 100 100 passing the address of x x pint or
int x = 100;
sub1 (&x);
void sub1 (int *pint) {
*pint = *pint + 25; }
passing the address of x x
pint or
de-referenced value of pint is the value of what pint points to
pint
&x

2. Example 2 125 passing the value of p which is the address of x 100 100
int x = 100;
int *p = &x;
sub1 (p);
void sub1 (int *pint) {
*pint = *pint + 25; } x
pint p
de-referenced value of pint is the value of what pint points to

3. Example 3 125 passing the address of p 100 100 x p ppint
int x = 100;
int *p = &x;
sub2 (&p);
void sub2 (int **ppint) {
**ppint = **ppint + 25; } x p
ppint
double de-referenced value of ppint is the value of the value of what ppint points to

4. Example 4 100 x passing the address of p p ppint
int x = 100;
int *p = &x;
sub2 (&p);
void sub2 (int **ppint) {
*ppint = malloc(sizeof(int));
**ppint = 50; } x
passing the address of p p
ppint
single de-referenced value of ppint is the value of what ppint points to. In this case, we are assigning a value to what ppint points to. 50
double de-referenced value of ppint is the value of the value of what ppint points to
malloc-ed

5. Example 5 100 x passing the address of p p ppint
int x = 100;
int *p = &x;
sub2 (&p);
void sub2 (int **ppint) {
ppint = malloc(sizeof(int));
*ppint = 50; } x
passing the address of p p
ppint
no de-referencing !! What is this changing? 50
single de-referenced value of ppint is the value of what ppint points to
ppint itself
malloc-ed