• Top
  • Documentation
  • Books
  • Boolean-reasoning
  • Projects
  • Debugging
  • Std
  • Proof-automation
  • Macro-libraries
  • ACL2
    • Theories
    • Rule-classes
    • Proof-builder
    • Recursion-and-induction
    • Hons-and-memoization
    • Events
    • Parallelism
    • History
    • Programming
    • Operational-semantics
    • Real
    • Start-here
    • Debugging
    • Miscellaneous
    • Output-controls
    • Macros
    • Interfacing-tools
      • Io
        • Fmt
        • Msg
        • Cw
        • Set-evisc-tuple
        • Set-iprint
        • Print-control
        • Read-file-into-string
        • Std/io
        • Msgp
        • Printing-to-strings
        • Evisc-tuple
        • Output-controls
        • Observation
        • *standard-co*
        • Ppr-special-syms
        • Standard-oi
        • Standard-co
        • Without-evisc
        • Serialize
        • Output-to-file
        • Fmt-to-comment-window
        • Princ$
        • Character-encoding
        • Open-output-channel!
        • Cw-print-base-radix
        • Set-print-case
        • Set-print-base
        • Print-object$
        • Extend-pathname
        • Print-object$+
        • Fmx-cw
        • Set-print-radix
        • Set-fmt-hard-right-margin
        • File-write-date$
        • Proofs-co
        • Set-print-base-radix
        • Print-base-p
        • *standard-oi*
        • Wof
        • File-length$
        • Fms!-lst
        • Delete-file$
        • *standard-ci*
        • Write-list
        • Trace-co
        • Fmt!
        • Fms
        • Cw!
        • Fmt-to-comment-window!
        • Fms!
        • Eviscerate-hide-terms
        • Fmt1!
        • Fmt-to-comment-window!+
        • Read-file-into-byte-array-stobj
        • Fmt1
        • Fmt-to-comment-window+
        • Cw-print-base-radix!
        • Read-file-into-character-array-stobj
        • Fmx
        • Cw!+
        • Read-objects-from-book
        • Newline
        • Cw+
        • Probe-file
        • Write-objects-to-file!
        • Write-objects-to-file
        • Read-objects-from-file
        • Read-object-from-file
        • Read-file-into-byte-list
        • Set-fmt-soft-right-margin
        • Read-file-into-character-list
        • Io-utilities
      • Defttag
      • Sys-call
      • Save-exec
      • Quicklisp
      • Std/io
      • Oslib
      • Bridge
      • Clex
      • Tshell
      • Unsound-eval
      • Hacker
      • ACL2s-interface
      • Startup-banner
      • Command-line
  • Interfacing-tools
    • Io
      • Fmt
      • Msg
      • Cw
      • Set-evisc-tuple
      • Set-iprint
      • Print-control
      • Read-file-into-string
      • Std/io
      • Msgp
      • Printing-to-strings
      • Evisc-tuple
      • Output-controls
      • Observation
      • *standard-co*
      • Ppr-special-syms
      • Standard-oi
      • Standard-co
      • Without-evisc
      • Serialize
      • Output-to-file
      • Fmt-to-comment-window
      • Princ$
      • Character-encoding
      • Open-output-channel!
      • Cw-print-base-radix
      • Set-print-case
      • Set-print-base
      • Print-object$
      • Extend-pathname
      • Print-object$+
      • Fmx-cw
      • Set-print-radix
      • Set-fmt-hard-right-margin
      • File-write-date$
      • Proofs-co
      • Set-print-base-radix
      • Print-base-p
      • *standard-oi*
      • Wof
      • File-length$
      • Fms!-lst
      • Delete-file$
      • *standard-ci*
      • Write-list
      • Trace-co
      • Fmt!
      • Fms
      • Cw!
      • Fmt-to-comment-window!
      • Fms!
      • Eviscerate-hide-terms
      • Fmt1!
      • Fmt-to-comment-window!+
      • Read-file-into-byte-array-stobj
      • Fmt1
      • Fmt-to-comment-window+
      • Cw-print-base-radix!
      • Read-file-into-character-array-stobj
      • Fmx
      • Cw!+
      • Read-objects-from-book
      • Newline
      • Cw+
      • Probe-file
      • Write-objects-to-file!
      • Write-objects-to-file
      • Read-objects-from-file
      • Read-object-from-file
      • Read-file-into-byte-list
      • Set-fmt-soft-right-margin
      • Read-file-into-character-list
      • Io-utilities
    • Defttag
    • Sys-call
    • Save-exec
    • Quicklisp
    • Std/io
    • Oslib
    • Bridge
    • Clex
    • Tshell
    • Unsound-eval
    • Hacker
    • ACL2s-interface
    • Startup-banner
    • Command-line
  • Hardware-verification
  • Software-verification
  • Math
  • Testing-utilities

• Io
• ACL2-built-ins

Set-print-radix

Control printing of the radix for numbers

Also see set-print-base-radix for a nice combined use of set-print-base and set-print-radix.

See set-print-base for background on how the print base affects the printing of numbers. set-print-radix affects whether a radix indicated when a number is printed. The radix is not indicated by default, or after evaluating (set-print-radix nil state). But if set-print-radix is called with a first argument that evaluates to a nonnil value — for example, (set-print-radix t state) — then the radix is shown when printing. (This behavior is consistent with the handling of Common Lisp global *print-radix*.) The following log illustrates how this works.

ACL2 !>(list 25 25/3)
(25 25/3)
ACL2 !>(set-print-base 16 state)
<state>
ACL2 !>(list 25 25/3)
(19 19/3)
ACL2 !>(set-print-radix t state)
<state>
ACL2 !>(list 25 25/3)
(#x19 #x19/3)
ACL2 !>(set-print-base 10 state)
<state>
ACL2 !>(list 25 25/3)
(25. #10r25/3)
ACL2 !>(set-print-radix nil state)
<state>
ACL2 !>(list 25 25/3)
(25 25/3)
ACL2 !>