Slide 4.13: Integer constants

Integer Constants

An integer constant is made up of an optional leading sign, one or more digits and an optional suffix character, a radix, indicating the base:

          [ { + | - } ]  digits  [ radix ]

Elements within square brackets [...] are optional.
Elements within braces {...} require a choice of one of the enclosed elements (separated by the | character).
Elements in italics denote items which have known definitions or descriptions.

If no radix is given, the integer constant is assumed to be decimal.

Radix	Description
`h`	hexadecimal
`q/o`	octal
`d`	decimal
`b`	binary
`r`	encoded real
`t`	decimal (alternate)
`y`	binary (alternate)

^†A hexadecimal constant beginning with a letter must have a leading zero to prevent the assembler from interpreting it as an identifier.

Constant	Representation
`130`	decimal
`78d`	decimal
`10010101b`	binary
`520q`	octal
`34o`	octal
`15A0h`	hexadecimal
`0F1Ah`	hexadecimal^†

Binary and Octal	Decimal and Hexadecimal	Decimal and Hexadecimal
.code mov eax, 1010b - 10q call WriteInt	.code mov eax, 10 * 10h call WriteInt	.code mov eax, 10d + Ah call WriteInt
Output	Output	Output

The procedure WriteInt writes a 32-bit signed integer to standard output in decimal format with a leading sign and no leading zeros. Before calling it, place the integer in EAX.