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A68G(1) Programmer's Manual A68G(1) NAME a68g - Algol 68 Genie, an Algol 68 compiler-interpreter SYNOPSIS a68g [--apropos | --help | --info [string]] [--assertions | --no-assertions] [--backtrace | --no-backtrace] [--brackets] [--check | --no-run] [--compile | --no-compile] [--clock] [--debug | --monitor] [--echo string] [--execute unit | -x unit] [--exit | --] [--extensive] [-f | --file string] [--frame number] [--handles number] [--heap number] [--listing] [--moids] [-O | -O0 | -O1 | -O2 | -O3] [--object | --no-object] [--overhead number] [--optimise | --no-optimise] [--pedantic] [--portcheck | --no-portcheck] [--pragmats | --no-pragmats] [--precision number] [--prelude-listing] [--pretty-print] [--print unit | -p unit] [--quiet] [--quote-stropping] [--reductions] [--rerun] [--run] [--script string] [--source | --no-source] [--stack number] [--statistics] [--strict] [--terminal] [--time-limit number] [--trace | --no-trace] [--tree | --no-tree] [--unused] [--upper-stropping] [--verbose] [--version] [--warnings | --no-warnings] [--xref | --no-xref] filename DESCRIPTION Algol 68 Genie (Algol68G) is an Algol 68 compiler-interpreter. It can be used for executing Algol 68 programs or scripts. Algol 68 is a rather lean orthogonal general-purpose language that is a beautiful means for denoting algorithms. Algol 68 was designed as a general-purpose program‐ ming language by IFIP Working Group 2.1 (Algorithmic Languages and Cal‐ culi) that has continuing responsibility for Algol 60 and Algol 68. Algol 68 Genie and its documentation can be obtained from http://jmvdveer.home.xs4all.nl/ OPTIONS Options are passed to a68g either from the file .a68g.rc in the working directory, the environment variable A68G_OPTIONS, the command-line or from pragmats. Option precedence is as follows: pragmat options supersede command-line options, command-line options supersede options in environment variable A68G_OPTIONS, A68G_OPTIONS supersedes options in .a68g.rc. Listing options, tracing options and -pragmat, -nopragmat, take their effect when they are encountered in a left-to-right pass of the program text, and can thus be used, for example, to generate a cross reference for a particular part of the program. Where numeric arguments are required, suffices k, M or G are allowed for multiplication with 2 ** 10, 2 ** 20 or 2 ** 30 respectively. --apropos | --help | --info [string] Print info on options if string is omitted, or print info on string otherwise. --assertions | --no-assertions Control elaboration of assertions. --backtrace | --no-backtrace Control whether a stack backtrace is done in case a runtime-error occurs. --brackets Consider [ .. ] and { .. } as being equivalent to ( .. ). Tradi‐ tional Algol 68 syntax allows ( .. ) to replace [ .. ] in bounds and slices. --check | --no-run Check syntax only, the interpreter does not start. --clock Report execution time excluding time needed for compilation. --compile | --no-compile Switch compilation of units on or off. Compilation omits many of the runtime checks offered by the interpreter proper. The program is not executed and a shell script is generated combining source code and its shared library. This shell script can be used as a pseudo-executable. --debug | --monitor Start in the monitor. Invoke the monitor in case a runtime-error occurs; the program will pause in the monitor on the line that contains the error. --echo string Echo string to standout. --execute unit | --x unit Execute the Algol 68 unit. In this way one-liners can be executed from the command line. --exit | -- Ignore further options. --extensive Generate an extensive listing. -f | --file string Accept string as filename in case it conflicts with shell syntax. --frame number Set the frame stack size to number bytes. --handles number Set the handle space size to number bytes. --heap number Set the heap size to number bytes. --listing Generate a concise listing. --moids Generate an overview of modes in the listing file. --object | --no-object Control the listing of C code in the listing file. --optimise | --no-optimise Switch compilation of units on or off. Compilation omits many of the runtime checks offered by the interpreter proper. This option is equivalent to -O2. -O | -O0 | -O1 | -O2 | -O3 Switch compilation of units on and pass the option to the back- end C compiler to set the optimiser level. --overhead number Set overhead for stack checking. --pedantic Equivalent to --warnings --portcheck --portcheck | --no-portcheck Enable or disable portability warning messages. --pragmats | --no-pragmats Control elaboration of pragmats. --precision number Set the precision for LONG LONG modes to number significant dig‐ its. --prelude-listing Generate a listing of preludes. --pretty-print Pretty-print the source file. --print unit | --p unit Print the value yielded by the Algol 68 unit. In this way one- liners can be executed from the command line. --quiet Suppress all warning messages. --quote-stropping Use quote stropping. --reductions Print reductions made by the parser. --rerun Use compiled code of a previous run. --run Override the --no-run option. --script string Takes string as source file name and skips further option pro‐ cessing so these can be handled by the script. --source | --no-source Control the listing of source lines in the listing file. --stack number Set the stack size to number bytes. --statistics Generate statistics in the listing file. --strict Ignores extensions to Algol 68 syntax. --time-limit number Interrupt the interpreter after number seconds, generating a time limit exceeded error. --trace | --no-trace Control tracing of the running program. --tree | --no-tree Control listing of the syntax tree in the listing file. --unused Generate an overview of unused tags in the listing file. --upper-stropping Use upper stropping, which is the default stropping regime. --verbose Use verbose mode. --version Print the version of the running image of a68g. --warnings | --no-warnings Enable warning messages or suppress suppressible warning mes‐ sages. --xref | --no-xref Control generation of a cross-reference in the listing file. AUTHOR Author of Algol 68 Genie is Marcel van der Veer <algol68g@xs4all.nl>. LINUX October 6, 2013 LINUX

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