Presentation is loading. Please wait.

Presentation is loading. Please wait.

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

Published by Modified over 8 years ago

Similar presentations

Presentation on theme: "1 Pointers Revisited Linda M c Iver. 2 Pointer Examples int i = 0; 0x2000 0x2001 0x2002 0x2003."— Presentation transcript:

1 1 Pointers Revisited Linda M c Iver

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

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

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

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

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

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

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

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

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

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

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

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

14 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 15 Pointer Examples 'b' char c = 'b'; c 0x2000 0x2001 0x2002 0x2003

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

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

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

19 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 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 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 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 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

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

Similar presentations

For(int i = 1; i

For(int i = 1; i
 Pointers, Arrays, Destructors Is this random stuff or are these somehow connected?

 Pointers, Arrays, Destructors Is this random stuff or are these somehow connected?
Introduction to Programming Lecture 15. In Today’s Lecture Pointers and Arrays Manipulations Pointers and Arrays Manipulations Pointers Expression Pointers.

Introduction to Programming Lecture 15. In Today’s Lecture Pointers and Arrays Manipulations Pointers and Arrays Manipulations Pointers Expression Pointers.
Pointer Variables The normal variables hold values. For example, int j; j = 2; Then a reference to j in an expression will be identified with the value.

Pointer Variables The normal variables hold values. For example, int j; j = 2; Then a reference to j in an expression will be identified with the value.
A pointer is the memory address of a variable. A memory address is a physical location within a system’s memory space. A pointer variable is variable used.

A pointer is the memory address of a variable. A memory address is a physical location within a system’s memory space. A pointer variable is variable used.
Data Structures (Second Part) Lecture 2 : Pointers Bong-Soo Sohn Assistant Professor School of Computer Science and Engineering Chung-Ang University.

Data Structures (Second Part) Lecture 2 : Pointers Bong-Soo Sohn Assistant Professor School of Computer Science and Engineering Chung-Ang University.
© Janice Regan, CMPT 128, February. 2007 0 CMPT 128: Introduction to Computing Science for Engineering Students Pointers.

© Janice Regan, CMPT 128, February CMPT 128: Introduction to Computing Science for Engineering Students Pointers.
Pointer to Structure. Structure variable can be access using pointers int a=10,*p; Here p  is an integer type pointer variable, p can hold the address.

Pointer to Structure. Structure variable can be access using pointers int a=10,*p; Here p  is an integer type pointer variable, p can hold the address.
Analysis of programs with pointers. Simple example What are the dependences in this program? Problem: just looking at variable names will not give you.

Analysis of programs with pointers. Simple example What are the dependences in this program? Problem: just looking at variable names will not give you.
By Senem Kumova Metin 1 POINTERS + ARRAYS + STRINGS REVIEW.

By Senem Kumova Metin 1 POINTERS + ARRAYS + STRINGS REVIEW.
Pointer. Warning! Dangerous Curves C (and C++) have just about the most powerful, flexible and dangerous pointers in the world. –Most other languages.

Pointer. Warning! Dangerous Curves C (and C++) have just about the most powerful, flexible and dangerous pointers in the world. –Most other languages.
Introduction to Data Structure, Spring 2007 Slide- 1 California State University, Fresno Introduction to Data Structure Memory Allocation Ming Li Department.

Introduction to Data Structure, Spring 2007 Slide- 1 California State University, Fresno Introduction to Data Structure Memory Allocation Ming Li Department.
Main Index Contents 11 Main Index Contents Pointer Illustration Pointer Illustration Vertical / Horizontal View. Vertical / Horizontal View. Data Addresses.

Main Index Contents 11 Main Index Contents Pointer Illustration Pointer Illustration Vertical / Horizontal View. Vertical / Horizontal View. Data Addresses.
Class 3: Linked Lists. cis 335 Fall 2001 Barry Cohen What is a linked list? n A linked list is an ordered series of ‘nodes’ n Each node contains some.

Class 3: Linked Lists. cis 335 Fall 2001 Barry Cohen What is a linked list? n A linked list is an ordered series of ‘nodes’ n Each node contains some.
Introduction to Data Structure, Spring 2007 Slide- 1 California State University, Fresno Introduction to Data Structure C Programming Concepts Ming Li.

Introduction to Data Structure, Spring 2007 Slide- 1 California State University, Fresno Introduction to Data Structure C Programming Concepts Ming Li.
Main Index Contents 11 Main Index Contents Pointer Illustration Pointer Illustration Vertical / Horizontal View. Vertical / Horizontal View. Data Addresses.

Main Index Contents 11 Main Index Contents Pointer Illustration Pointer Illustration Vertical / Horizontal View. Vertical / Horizontal View. Data Addresses.
© Janice Regan, CMPT 102, Sept. 2006 0 CMPT 102 Introduction to Scientific Computer Programming Pointers.

© Janice Regan, CMPT 102, Sept CMPT 102 Introduction to Scientific Computer Programming Pointers.
Pointers Mark Hennessy Dept. Computer Science NUI Maynooth C++ Workshop 18 th – 22 nd September 2006.

Pointers Mark Hennessy Dept. Computer Science NUI Maynooth C++ Workshop 18 th – 22 nd September 2006.
Overview Pointer Variables Pass by Value Pass by Reference (or by Pointer) Arrays.

Overview Pointer Variables Pass by Value Pass by Reference (or by Pointer) Arrays.
1 Chapter 9 Pointers. 2 Topics 8.1 Getting the Address of a Variable 8.2 Pointer Variables 8.3 Relationship Between Arrays and Pointers 8.4 Pointer Arithmetic.

1 Chapter 9 Pointers. 2 Topics 8.1 Getting the Address of a Variable 8.2 Pointer Variables 8.3 Relationship Between Arrays and Pointers 8.4 Pointer Arithmetic.

Similar presentations

Ads by Google