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C Programming: Pointer (Examples)

J
Joongheon Kim

The document is a series of slides from a lecture on C programming pointers by Professor Joongheon Kim. It contains examples of using pointers with basic data types like integers and characters, as well as more complex examples involving pointers to arrays and functions. The examples are presented step-by-step with diagrams and explanations to illustrate how pointers store memory addresses and can be used to indirectly access and modify values in memory.

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Professor Joongheon Kim https://joongheon.github.io C Programming C Programming Pointer (Examples) Directed by Prof. Joongheon Kim Korea University, School of Electrical Engineering Artificial Intelligence and Mobility Laboratory https://joongheon.github.io joongheon@korea.ac.kr
Professor Joongheon Kim https://joongheon.github.io C Programming Outline • Pointers • Pointers and Arrays • Pointers and Functions 2
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.1) 3 • Introduction Example Int: x 0xf1
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.1) 4 • Introduction Example Int: x 0xf1 Pointer (Int): ptr_x
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.1) 5 • Introduction Example 100 Int: x 0xf1 Pointer (Int): ptr_x
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.1) 6 • Introduction Example 100 0xf1 0xf1 Int: x Pointer (Int): ptr_x
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.1) 7 • Introduction Example 100 0xf1 0xf1 x: 100, &x: 0xf1 Int: x Pointer (Int): ptr_x
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.1) 8 • Introduction Example 100 0xf1 0xf1 x: 100, &x: 0xf1 *ptr_x: 100, ptr_x: 0xf1 Int: x Pointer (Int): ptr_x
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.1) 9 • Introduction Example 200 0xf1 0xf1 x: 100, &x: 0xf1 *ptr_x: 100, ptr_x: 0xf1 Int: x Pointer (Int): ptr_x
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.1) 10 • Introduction Example 200 0xf1 0xf1 x: 100, &x: 0xf1 *ptr_x: 100, ptr_x: 0xf1 x: 200, *ptr_x: 200 Int: x Pointer (Int): ptr_x
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.2) 11 • Address of Arrays 1 Int: x 0xf1 2 Int: y 0xcc Int Array: z[2] 0xd3
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.2) 12 • Address of Arrays 1 0xf1 2 0xcc 0xd3 Int: x Int: y Int Array: z[2] Pointer (Int): ptr
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.2) 13 • Address of Arrays 0xf1 2 0xcc 0xd3 Int: x Int: y Int Array: z[2] Pointer (Int): ptr 0xf1 1
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.2) 14 • Address of Arrays ptr: 0xf1 1 0xf1 2 0xcc 0xd3 Int: x Int: y Int Array: z[2] Pointer (Int): ptr 0xf1
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.2) 15 • Address of Arrays ptr: 0xf1 1 0xf1 1 0xcc 0xd3 Int: x Int: y Int Array: z[2] Pointer (Int): ptr 0xf1
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.2) 16 • Address of Arrays ptr: 0xf1 y: 1 1 0xf1 1 0xcc 0xd3 Int: x Int: y Int Array: z[2] Pointer (Int): ptr 0xf1
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.2) 17 • Address of Arrays ptr: 0xf1 y: 1 0 0xf1 1 0xcc 0xd3 Int: x Int: y Int Array: z[2] Pointer (Int): ptr 0xf1
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.2) 18 • Address of Arrays ptr: 0xf1 y: 1 *ptr: 0 0 0xf1 1 0xcc 0xd3 Int: x Int: y Int Array: z[2] Pointer (Int): ptr 0xf1
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.2) 19 • Address of Arrays ptr: 0xf1 y: 1 *ptr: 0 0 0xf1 1 0xcc 0xd3 Int: x Int: y Int Array: z[2] Pointer (Int): ptr 0xd3
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.2) 20 • Address of Arrays ptr: 0xf1 y: 1 *ptr: 0 ptr: 0xd3 0 0xf1 1 0xcc 0xd3 Int: x Int: y Int Array: z[2] Pointer (Int): ptr 0xd3
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.2) 21 • Address of Arrays ptr: 0xf1 y: 1 *ptr: 0 ptr: 0xd3 z[0]: 1212133 /* garbage */ 0 0xf1 1 0xcc 0xd3 Int: x Int: y Int Array: z[2] Pointer (Int): ptr 0xd3
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.3) 22 • Arithmetic 1 100 0xf1 200 0xcc 0xd3 Int: x Int: y Int: sum
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.3) 23 • Arithmetic 1 100 0xf1 200 0xcc 0xd3 Int: x Int: y Int: sum Pointer (Int): ptr_x Pointer (Int): ptr_y Pointer (Int): ptr_sum
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.3) 24 • Arithmetic 1 100 0xf1 200 0xcc 0xd3 Int: x Int: y Int: sum Pointer (Int): ptr_x 0xf1 Pointer (Int): ptr_y 0xcc Pointer (Int): ptr_sum 0xd3
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.3) 25 • Arithmetic 1 100 0xf1 200 0xcc 300 0xd3 Int: x Int: y Int: sum Pointer (Int): ptr_x 0xf1 Pointer (Int): ptr_y 0xcc Pointer (Int): ptr_sum 0xd3
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.3) 26 • Arithmetic 1 ptr_x: 0xf1, ptr_y: 0xcc *ptr_x: 100, *ptr_y: 200 *ptr_sum: 300 100 0xf1 200 0xcc 300 0xd3 Int: x Int: y Int: sum Pointer (Int): ptr_x 0xf1 Pointer (Int): ptr_y 0xcc Pointer (Int): ptr_sum 0xd3
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.4) 27 • Arithmetic 2 100 0xf1 Int: x Pointer (Int): ptr_x
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.4) 28 • Arithmetic 2 100 0xf1 Int: x Pointer (Int): ptr_x 0xf1
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.4) 29 • Arithmetic 2 300 0xf1 Int: x Pointer (Int): ptr_x 0xf1
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.4) 30 • Arithmetic 2 300 0xf1 Int: x Pointer (Int): ptr_x 0xf1 x: 300 *ptr_x: 300, ptr_x: 0xf1
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 1.5) • Operator * 31 0x7ffd316b35a7 A A
Professor Joongheon Kim https://joongheon.github.io C Programming Outline • Pointers • Pointers and Memory • Multiple Pointers • Pointers and Arrays • Pointers and Functions 32
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 2.1) • Pointer and Memory (char) 33 1 A 65 (= ‘A’) 097 098 099 100 101 102 103 104 105 106 107 108 109 110 111 c (char) • ASCII code of “A” It says sizeof(c) is 1. It means “char” uses 1 Byte in memory. • Address (or Starting Address)
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 2.2) • Pointer and Memory (int) 34 4 10 097 098 099 100 101 102 103 104 105 106 107 108 109 110 111 a (int) It says sizeof(a) is 4. It means “int” uses 4 Bytes in memory. 10
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 2.3) • Pointer and Memory (double) 35 8 10 097 098 099 100 101 102 103 104 105 106 107 108 109 110 111 a (double) It says sizeof(a) is 8. It means “double” uses 8 Bytes in memory. 10
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 2.4) • Pointer and Memory Address (char) 36 65 (= ‘A’) 66 (= ‘B’) 0x7fffc67cfb66 0x7fffc67cfb67 0x7fffc67cfb68 a (char) 0x7fffc67cfb66 0x7fffc67cfb67 0x7fffc67cfb67 0x7fffc67cfb68 b (char) &a &b &a+1 &b+1
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 2.5) • Pointer and Memory Address (int) 37 0x7ffdcbaf29d0 0x7ffdcbaf29d1 0x7ffdcbaf29d2 0x7ffdcbaf29d3 0x7ffdcbaf29d4 0x7ffdcbaf29d5 0x7ffdcbaf29d6 0x7ffdcbaf29d7 0x7ffdcbaf29d8 0x7ffdcbaf29d0 0x7ffdcbaf29d4 0x7ffdcbaf29d4 0x7ffdcbaf29d8 &a &b &a+1 &b+1 a (int) 1 b (int) 2
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 2.6) • Type Conversion in Address 38 0x7fff7a2ab1b7 0x7fff7a2ab1b7 0x7fff7a2ab1b7 0x7fff7a2ab1b8 0x7fff7a2ab1b8 0x7fff7a2ab1bb
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 2.7) • Sizes of Individual Types (char and int) 1 39 A A 1 8 1 8 ===== 10 10 4 8 4 8
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 2.8) • Sizes of Individual Types (char and int) 2 40 1 1 8 4 4 8
Professor Joongheon Kim https://joongheon.github.io C Programming Outline • Pointers • Pointers and Memory • Multiple Pointers • Pointers and Arrays • Pointers and Functions 41
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 3.1) • Double Pointer 42 A A A 0x7fff14e17fc3 0x7fff14e17fc3 0x7fff14e17fc3 ===== 10 10 10 0x7fff14e17fc4 0x7fff14e17fc4 0x7fff14e17fc4
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 3.2) • Multiple Pointer 43 10 10 10 10 4 8 8 8 4 8 8 8
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers (Example 3.3) • Size of Multiple Pointers 44 10 10 10 4 4 4 4 8 8
Professor Joongheon Kim https://joongheon.github.io C Programming Outline • Pointers • Pointers and Memory • Multiple Pointers • Pointers and Arrays • Pointers and Functions 45
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Arrays (Introduction) • Array x • x: constant pointer pointing the first element x[0] • Thus, the value of x is 1000, i.e., x = &x[0] = 1000 • If we declare p as an integer pointer (int *p;), the pointer p can point to the array x by p=x; (equivalent to p = &x[0]) • p = &x[0] // == 1000 p+1 = &x[1] // == 1004 p+2 = &x[2] // == 1008 p+3 = &x[3] // == 1012 p+4 = &x[4] • *(p+3) gives the value of x[3], i.e., 4. 46 int x[5] = {1, 2, 3, 4, 5}; 1 2 3 4 5 x[0] x[1] x[2] x[3] x[4] 1000 1004 1008 1012 1016
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Arrays (Example 4.1) 47
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Arrays (Character Strings) • Character String x 48 char x[5] = “good”; g o o d 0 x[0] x[1] x[2] x[3] x[4] 1000 1004 1008 1012 1016 char *x = “good”; x
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Arrays (Example 4.2) R e p u b l i c o f K o r e a 0 49 P . R . C h i n a 0 J a p a n 0 name[0] name[1] name[2]
Professor Joongheon Kim https://joongheon.github.io C Programming Outline • Pointers • Pointers and Memory • Multiple Pointers • Pointers and Arrays • Pointers and Functions 50
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Functions (Example 5.1) 51 20 Int: x 0xf1 10 Int: y 0xcc Int: s 0xfd Int: d 0xdc
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Functions (Example 5.1) 52 20 Int: x 0xf1 10 Int: y 0xcc Int: s 0xfd Int: d 0xdc
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Functions (Example 5.1) 53 20 Int: x 0xf1 10 Int: y 0xcc Int: s 0xfd Int: d 0xdc 20 Int: a 10 Int: b 0xfd Pointer (Int): sum 0xdc Pointer (Int): dif
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Functions (Example 5.1) 54 20 Int: x 0xf1 10 Int: y 0xcc 30 Int: s 0xfd 10 Int: d 0xdc 20 Int: a 10 Int: b 0xfd Pointer (Int): sum 0xdc Pointer (Int): dif
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Functions (Example 5.1) 55 20 Int: x 0xf1 10 Int: y 0xcc 30 Int: s 0xfd 10 Int: d 0xdc s: 30, d: 10 20 Int: a 10 Int: b 0xfd Pointer (Int): sum 0xdc Pointer (Int): dif
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Functions (Example 5.2) 56 10 Int: x 0xf1 20 Int: y 0xcc x: 10, y: 20
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Functions (Example 5.2) 57 10 Int: x 0xf1 20 Int: y 0xcc &x x: 10, y: 20 &y
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Functions (Example 5.2) 58 10 Int: x 0xf1 20 Int: y 0xcc &x &y Int: t 0xfc x: 10, y: 20 0xf1 Pointer (Int): a 0xcc Pointer (Int): b
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Functions (Example 5.2) 59 x: 10, y: 20 10 Int: x 0xf1 20 Int: y 0xcc &x &y 10 Int: t 0xfc 0xf1 Pointer (Int): a 0xcc Pointer (Int): b
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Functions (Example 5.2) 60 x: 10, y: 20 20 Int: x 0xf1 20 Int: y 0xcc &x &y 10 Int: t 0xfc 0xf1 Pointer (Int): a 0xcc Pointer (Int): b
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Functions (Example 5.2) 61 x: 10, y: 20 20 Int: x 0xf1 10 Int: y 0xcc &x &y 10 Int: t 0xfc 0xf1 Pointer (Int): a 0xcc Pointer (Int): b
Professor Joongheon Kim https://joongheon.github.io C Programming Pointers and Functions (Example 5.2) 62 x: 10, y: 20 x: 20, y: 10 20 Int: x 0xf1 10 Int: y 0xcc &x &y 10 Int: t 0xfc 0xf1 Pointer (Int): a 0xcc Pointer (Int): b
Professor Joongheon Kim https://joongheon.github.io C Programming Q&A Thank you for your attention! • More questions? • joongheon@korea.ac.kr • More details? • https://joongheon.github.io/ 63

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C Programming: Pointer (Examples)