Fundamentals of Programming

Fundamentals of Programming

lecture 19

Pointers and Arrays,

Pointer Arithmetic

Array arguments are addresses

Array arguments vs Pointers

Array arguments vs Pointers

The following are equivalent

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

pointerarray7.c

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

pointerarray10.c pointers and arrays are the same right?

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

Arrays vs. Pointers

pointerarray11.c

Arrays vs. Pointers

pointerarray11.c

somehow, similar to int * const p;

Arrays vs. Pointers: size

Arrays vs. Pointers: size

Arrays vs. Pointers: size

pointerarray12.c

Addressed are stored in 8 bytes in

Arrays vs. Pointers: size

Arrays vs. Pointers: size

pointerarray12.c

Addressed are stored in 4 bytes in

Array arguments: size

Array arguments: size

Array arguments: size

pointerarray14.c

Pointer Arithmetic

Pointer Arithmetic

Pointer Arithmetic

pointerarithmetic1.c

Pointer arithmetic: pointer + integer

Pointer arithmetic: pointer + integer

pointerarithmetic2.c

4 3 2 1

2012 2008 2004 a = 2000

5 Memory

2016

Pointer arithmetic: pointer + integer

pointerarithmetic2.c

4 3 2 1

2012 2008 2004 a = 2000

Memory

2016 p = 2000

Pointer arithmetic: pointer + integer

pointerarithmetic2.c

4 3 2 1

2012 2008 2004 a = 2000

5 Memory

2016 p = 2000

p+1 = ?

p+2 = ?

Pointer arithmetic: pointer + integer

pointerarithmetic2.c

4 3 2 1

2012 2008 2004 a = 2000

Memory

2016 p = 2000

p+1 = 2004

p+2 = 2008

Pointer arithmetic: pointer + integer

pointerarithmetic2.c

4 3 2 1

2012 2008 2004 a = 2000

5 Memory

2016 p = 2000

p+1 = 2004

p+2 = 2008

The precedence table

*p+i

*(p+i)

pointer definition

pointer definition

pointer definition

pointer definition

pointer arithmetic & arrays

pointer arithmetic & arrays

pointerarithmetic5.c pointerarithmetic6.c

pointer arithmetic & arrays

a[0] ≡ *a a[i] ≡ *(a+i)

pointerarithmetic5.c pointerarithmetic6.c

pointer arithmetic & arrays

pointer arithmetic & arrays

pointerarithmetic8.c

Exercise

Exercise

Subtracting two pointers

int a[10];

int *p = a;

int *q = &a[6];

int i = q - p;

Subtracting two pointers

int a[10];

int *p = a;

int *q = &a[6];

int i = q - p;