C Reference Cheat Sheet (Page 4 of 13) in pdf

C Reference Cheat Sheet

Ashlyn Black

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Pointers (cont)

Arrays (cont)

They can also have an incomplete type. Operators other

Same as name[ i nt].

void *v;

*(name + int)

than assignment cannot be applied as the length of the type

Elements are contiguously numbered ascending from 0.

is unknown.

Memory address of element int in

&name[int]

A data structure pointer.

struct

array name.

type *y;

Same as & n am e [i n t].

name + int

An array/ s tring name can be used as a pointer to the first

type

array element.

Elements are stored in contiguous memory.

z[];

Measuring

Accessing

Returns length of array. (Unsafe)

sizeof(array) /

A memory address.

sizeof(arrayType)

Value stored at that address.

Returns length of array. (Safe)

sizeof(array) /

Value stored in structure pointer y member a.

y->a

sizeof(array[0])

Memory address of normal variable varName.

&varName

Dereferencing a void pointer as a type pointer.

Strings

*(type

*)v

'A' character

Single quotes.

A pointer is a variable that holds a memory location.

"AB" string

Double quotes.

Null termin a tor.

Arrays

Strings are char arrays.

Decl a ring

char name[4] = "Ash";

You set array length.

type name[int];

is equivalent to

You set array length and initialise

type name[int] = {x,

elements.

char name[4] = {'A', 's', 'h', '\0'};

y, z};

int i; for(i = 0; name[i]; i++){}

You set array length and initialise all

type name[int] = {x};

elements to x.

\0 evaluates as false.

Compiler sets array length based on initial

type name[] = {x, y,

Strings must include a char element for \0.

elements.

z};

Size cannot be changed after declaration.

Escape Characters

Dimensions

alarm (bell/beep)

backspace

One dimension array.

name[int]

formfeed

newline

Two dimens i onal array.

name[int][int]

carriage return

horizontal tab

Accessing

vertical tab

backslash

Value of element int in array name.

name[int]

single quote

double quote

question mark

Any octal ANSI character code.

\nnn

Any hexadecimal ANSI character code.

\xhh

By Ashlyn Black

Published 28th January, 2015.

C Reference Cheat Sheet Page 4

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