Arm VERSION 1.2 Manuel d'utilisateur télécharger pdf (Page 26)

100

101

Writing ARM and Thumb Assembly Language

Constants

Constants can be numeric, boolean, character or string:

Numbers Numeric constants are accepted in three forms:

• Decimal, for example,

123

• Hexadecimal, for example,

0x7B

•

n_xxx

where:

is a base between 2 and 9

xxx

is a number in that base.

Boolean The Boolean constants

TRUE

and

FALSE

must be written as

{TRUE}

and

{FALSE}

Characters Character constants consist of opening and closing single quotes,

enclosing either a single character or an escaped character, using the

standard C escape characters.

Strings Strings consist of opening and closing double quotes, enclosing

characters and spaces. If double quotes or dollar signs are used within a

string as literal text characters, they must be represented by a pair of the

appropriate character. For example, you must use

if you require a

single

in the string. The standard C escape sequences can be used within

string constants.

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Arm VERSION 1.2 Manuel d'utilisateur Page 26

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