1 Pointers Revisited Linda M c Iver. 2 Pointer Examples int i = 0; 0x2000 0x2001 0x2002 0x2003.

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Presentation transcript:

1 Pointers Revisited Linda M c Iver

2 Pointer Examples int i = 0; 0x2000 0x2001 0x2002 0x2003

3 Pointer Examples 0 int i = 0; i 0x2000 0x2001 0x2002 0x2003

4 Pointer Examples 0 int i = 0; int* intPtr = NULL; i 0x2000 0x2001 0x2002 0x2003 int i = 0;

5 Pointer Examples 0NULL int i = 0; int* intPtr = NULL; i intPtr 0x2000 0x2001 0x2002 0x2003 int i = 0;

6 Pointer Examples 0 NULL int i = 0; int* intPtr = NULL; intPtr = &i; i intPtr 0x2000 0x2001 0x2002 0x2003

7 Pointer Examples 0 0x2000 int i = 0; int* intPtr = NULL; intPtr = &i; i intPtr 0x2000 0x2001 0x2002 0x2003

8 Pointer Examples 0 0x2000 i intPtr 0x2000 0x2001 0x2002 0x2003 What do these expressions evaluate to? &i intPtr *intPtr i &intPtr

9 Pointer Examples 0 0x2000 i intPtr 0x2000 0x2001 0x2002 0x2003 What do these expressions evaluate to? &i 0x2000 intPtr *intPtr i &intPtr

10 Pointer Examples 0 0x2000 i intPtr 0x2000 0x2001 0x2002 0x2003 What do these expressions evaluate to? &i 0x2000 intPtr0x2000 *intPtr i &intPtr

11 Pointer Examples 0 0x2000 i intPtr 0x2000 0x2001 0x2002 0x2003 What do these expressions evaluate to? &i 0x2000 intPtr0x2000 *intPtr0 i &intPtr

12 Pointer Examples 0 0x2000 i intPtr 0x2000 0x2001 0x2002 0x2003 What do these expressions evaluate to? &i 0x2000 intPtr0x2000 *intPtr0 i0 &intPtr

13 Pointer Examples 0 0x2000 i intPtr 0x2000 0x2001 0x2002 0x2003 What do these expressions evaluate to? &i 0x2000 intPtr0x2000 *intPtr0 i0 &intPtr0x2001

14 Pointer Examples &i == intPtr == 0x2000 i == *intPtr == 0 int i = 0; int* intPtr = NULL; intPtr = &i; 0 0x2000 i intPtr 0x2000 0x2001 0x2002 0x2003

15 Pointer Examples 'b' char c = 'b'; c 0x2000 0x2001 0x2002 0x2003

16 Pointer Examples 'b'NULL char c = 'b'; char* charPtr = NULL; c charPtr 0x2000 0x2001 0x2002 0x2003

17 Pointer Examples 'b'NULL char c = 'b'; char* charPtr = NULL; c charPtr 0x2000 0x2001 0x2002 0x2003 What does *charPtr evaluate to now?

18 Pointer Examples 'b'NULL 'L' char c = 'b'; char* charPtr = NULL; char initial = 'L'; c charPtr initial 0x2000 0x2001 0x2002 0x2003

19 Pointer Examples 'b'0x2000 'L' char c = 'b'; char* charPtr = NULL; char initial = 'L'; charPtr = &c; c charPtr initial 0x2000 0x2001 0x2002 0x2003

20 Pointer Examples 'b'0x2000 'L' char c = 'b'; char* charPtr = NULL; char initial = 'L'; charPtr = &c; c charPtr initial 0x2000 0x2001 0x2002 0x2003 What does *charPtr evaluate to now?

21 Pointer Examples 'b'0x2002 'L' char c = 'b'; char* charPtr = NULL; char initial = 'L'; charPtr = &c; charPtr = &initial; c charPtr initial 0x2000 0x2001 0x2002 0x2003

22 Pointer Examples 'b'0x2002 'L' char c = 'b'; char* charPtr = NULL; char initial = 'L'; charPtr = &c; charPtr = &initial; c charPtr initial 0x2000 0x2001 0x2002 0x2003 What does *charPtr evaluate to now?

23 Pointer Summary A pointer holds an address & gives you the address of a variable *somePtr is a de-reference, which gives you the value of the variable pointed to by somePtr Like variables, pointers have a particular type