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Unduh sekarang ( 41 Halaman )

Teks penuh

(1)

Fundamentals of Programming

session 23

Introduction to Pointers

(2)

What is a Pointer?

(3)

What is a Pointer?

(4)

What is a Pointer?

(5)

What is a Pointer?

-101 1204

2100 2096 2092 2088

Memory

int i = 1204;

int j = -101; j

i

(6)

What is a Pointer?

-101 1204

2100 2096 2092 2088

Memory

int i = 1204;

int j = -101;

printf("%u\n", &i);

j i

i j &i &j 1204 -101 2088 2092

(7)

What is a Pointer?

-101 1204

2100 2096 2092 2088

2088 Memory

int i = 1204;

int j = -101; j

i

2108

(8)

What is a Pointer?

-101 1204

2100 2096 2092 2088

2088 Memory

int i = 1204;

int j = -101; j

i

2108

(9)

What is a Pointer?

-101 1204 Memory

int i = 1204;

int j = -101; j

i

(10)

What is a Pointer?

-101 1204

2100 2096 2092 2088

2088 Memory

int i = 1204;

int j = -101;

int *p;

p = &i;

j i

2108 p

(11)

What is a Pointer?

-101 1204

2100 2096 2092 2088

2088 Memory

int i = 1204;

int j = -101;

int *p;

p = &i;

j i

2108 p i p &i &p

? ? ? ?

(12)

What is a Pointer?

-101 1204

2100 2096 2092 2088

2088 Memory

int i = 1204;

int j = -101;

int *p;

p = &i;

j i

2108 p i p &i &p

1204 ? ? ?

(13)

What is a Pointer?

-101 1204

2100 2096 2092 2088

2088 Memory

int i = 1204;

int j = -101;

int *p;

p = &i;

j i

2108 p i p &i &p

1204 2088 ? ?

(14)

What is a Pointer?

-101 1204

2100 2096 2092 2088

2088 Memory

int i = 1204;

int j = -101;

int *p;

p = &i;

j i

2108 p i p &i &p

1204 2088 2088 ?

(15)

What is a Pointer?

-101 1204

2100 2096 2092 2088

2088 Memory

int i = 1204;

int j = -101;

int *p;

p = &i;

j i

2108 p i p &i &p

1204 2088 2088 2108

(16)

What is a Pointer?

-101 1204

2100 2096 2092 2088

2088 Memory

int i = 1204;

int j = -101;

int *p;

p = &i;

j i

2108 p i p &i &p

1204 2088 2088 2108

(17)

What is a Pointer?

1204

2100 2096 2092 2088

2088 Memory

int i = 1204;

int j = -101;

int *p;

p = &i;

j = *p;

j i

2108 p

i p &i &p *p

1204 2088 2088 2108 ?

(18)

What is a Pointer?

1204 1204

2100 2096 2092 2088

2088 Memory

int i = 1204;

int j = -101;

int *p;

p = &i;

j = *p;

j i

2108 p

i p &i &p *p

1204 2088 2088 2108 1204

(19)

What is a Pointer?

1204

?

2100 2096 2092 2088

? Memory

int i = 1204;

int j = -101;

int *p;

p = &i;

j = *p;

*p = -22;

j i

2108 p

i p &i &p *p

? ? ? ? ?

(20)

What is a Pointer?

1204 -22

2100 2096 2092 2088

2088

Memory

int i = 1204;

int j = -101;

int *p;

p = &i;

j = *p;

*p = -22;

j i

2108 p

i p &i &p *p

-22 2088 2088 2108 -22

(21)

Simulating by-reference argument passing

(22)

Simulating by-reference argument passing

(23)

Simulating by-reference arguments

x

p

Memory

(24)

multiple outputs

main:r main:q main:b main:a

divide:qp divide:b divide:a

Memory

divide:rp

(25)

Arguments are still by-value

main:r main:q main:b

divide:qp divide:b divide:a

Memory

divide:rp main:a

divide:rp

divide:qp divide:b divide:a

divide:rp divide:rp

(26)

Arguments are still by-value

main:r main:q main:b

divide:qp divide:b divide:a

Memory

divide:rp main:a

divide:rp

divide:qp divide:b divide:a

divide:rp divide:rp

(27)

Arguments are still by-value

main:r main:q main:b

divide:qp divide:b divide:a

Memory

divide:rp main:a

divide:rp

divide:qp divide:b divide:a

divide:rp divide:rp

(28)

use %p to print addresses

main:r main:q main:b

divide:qp divide:b divide:a

Memory

divide:rp main:a

divide:rp

divide:qp divide:b divide:a

divide:rp divide:rp

(29)

Example: Swapping

pointerfunc5_swap.c

(30)

constant pointers

(31)

constant pointers

(32)

constant pointers

(33)

constant pointers

(34)

constant pointers

(35)

constant pointers

(36)

constant pointers

(37)

constant pointers

(38)

constant pointers

(39)

constant pointers

(40)

constant pointers

(41)

constant pointers

same thing

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