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12.15 Syntax of numeric literals

Numeric literals consist of a sequence of characters, or a single character in quotes, evaluating to an integer.

They can take any of the following forms:

  • decimal-digits.
  • 0xhexadecimal-digits.
  • &hexadecimal-digits.
  • n_base-n-digits.
  • 'character'.

where:

decimal-digits

Is a sequence of characters using only the digits0 to 9.

hexadecimal-digits

Is a sequence of characters using only the digits0 to 9 and the letters A to F or a to f.

n_

Is a single digit between 2 and 9 inclusive, followedby an underscore character.

base-n-digits

Is a sequence of characters using only the digits 0 to (n –1)

character

Is any single character except a single quote. Use the standard C escape character (\') if you require a single quote. The character must be enclosed within opening and closing single quotes. In this case, the value of the numeric literal is the numeric code of the character.

You must not use any other characters. The sequence of characters must evaluate to an integer.

In A32/T32 code, the range is 0 to 232-1, except in DCQ, DCQU, DCO, and DCOU directives.

In A64 code, the range is 0 to 264-1, except in DCO and DCOU directives.

Note

  • In the DCQ and DCQU, the integer range is 0 to 264-1
  • In the DCO and DCOU directives, the integer range is 0 to 2128-1

Examples

a       SETA    34906addr    DCD     0xA10E        LDR     r4,=&1000000F        DCD     2_11001010c3      SETA    8_74007        DCQ     0x0123456789abcdef        LDR     r1,='A'      ; pseudo-instruction loading 65 into r1        ADD     r3,r2,#'\''  ; add 39 to contents of r2, result to r3

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