Lexical Elements of the DEC Text Processing Utility Language 4.10 Lexical Keywords

4.10.2 Specifying the Radix of Numeric Constants

You can specify constants with binary, octal, hexadecimal, and decimal radices.

To specify a numeric constant in binary, precede the number with %B. The number can consist only of the digits 0 and 1.

To specify a numeric constant in octal, precede the number with %O. The number can consist only of the digits 0 through 7.

To specify a numeric constant in hexadecimal, precede the number with %X. The number can consist of digits 0–9 and A–F.

There is no radix specifier for decimal. Any numeric constant without an explicit radix specifier is assumed to be decimal. The radix specifier may be in uppercase or lowercase.

The following are examples of correct numeric constants:

!

!Many different ways of saying the same thing.

CONSTANT binary_constant := %b11111; CONSTANT octal_constant := %o37;

CONSTANT decimal_constant := 31; CONSTANT hex_constant := %x1f;

!Compile time expressions work, too.

!

CONSTANT negative_value := -%x1f;

CONSTANT strange_zero := hex_constant - %x1f;

Invalid constructs for numeric constants return the error level message TPU$_ UNKLEXICAL, "Unknown lexical element" during compilation. The following examples are not valid:

constant bad_binary := %b123; constant bad_hex := %x10abg; constant not_a_radix := %z0123;

!only 0’s and 1’s are legal.

!’g’ is illegal digit.

!No such radix.

4–34Lexical Elements of the DEC Text Processing Utility Language

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Compaq AA-PWCBD-TE manual Many different ways of saying the same thing
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AA-PWCBD-TE specifications

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