---

6 Prolog built-in predicates

• Type testing
  • var/1, nonvar/1, atom/1, integer/1, float/1, number/1, atomic/1,
    compound/1, callable/1, list/1, partial_list/1, list_or_partial_list/1
• Term unification
  • (=)/2 - Prolog unification
  • unify_with_occurs_check/2
  • (\=)/2 - not Prolog unifiable
• Term comparison
  • Standard total ordering of terms
  • (==)/2 - term identical, (\==)/2 - term not identical,
    (@<)/2 - term less than, (@=<)/2 - term less than or equal to,
    (@>)/2 - term greater than, (@>=)/2 - term greater than or equal to
  • compare/3
• Term processing
  • functor/3
  • arg/3
  • (=..)/2 - univ
  • copy_term/2
  • setarg/4, setarg/3
• Variable naming/numbering
  • name_singleton_vars/1
  • name_query_vars/2
  • bind_variables/2, numbervars/3, numbervars/1
  • term_ref/2
• Arithmetic
  • Evaluation of an arithmetic expression
  • (is)/2 - evaluate expression
  • (=:=)/2 - arithmetic equal, (=\=)/2 - arithmetic not equal,
    (<)/2 - arithmetic less than, (=<)/2 - arithmetic less than or equal to,
    (>)/2 - arithmetic greater than, (>=)/2 - arithmetic greater than or equal to
• Dynamic clause management
  • Introduction
  • asserta/1, assertz/1
  • retract/1
  • retractall/1
  • clause/2
  • abolish/1
• Predicate information
  • current_predicate/1
  • predicate_property/2
• All solutions
  • Introduction
  • findall/3
  • bagof/3, setof/3
• Streams
  • Introduction
  • current_input/1
  • current_output/1
  • set_input/1
  • set_output/1
  • open/4, open/3
  • close/2, close/1
  • flush_output/1, flush_output/0
  • current_stream/1
  • stream_property/2
  • at_end_of_stream/1, at_end_of_stream/0
  • stream_position/2
  • set_stream_position/2
  • seek/4
  • character_count/2
  • line_count/2
  • line_position/2
  • stream_line_column/3
  • set_stream_line_column/3
  • add_stream_alias/2
  • current_alias/2
  • set_stream_type/2
  • set_stream_eof_action/2
  • set_stream_buffering/2
• Constant term streams
  • Introduction
  • open_input_atom_stream/2, open_input_chars_stream/2,
    open_input_codes_stream/2
  • close_input_atom_stream/1, close_input_chars_stream/1,
    close_input_codes_stream/1
  • open_output_atom_stream/1, open_output_chars_stream/1,
    open_output_codes_stream/1
  • close_output_atom_stream/2, close_output_chars_stream/2,
    close_output_codes_stream/2
• Character input/output
  • get_char/2, get_char/1, get_code/1, get_code/2
  • get_code_no_echo/2, get_code_no_echo/1
  • peek_char/2, peek_char/1, peek_code/1, peek_code/2
  • unget_char/2, unget_char/1, unget_code/2, unget_code/1
  • put_char/2, put_char/1, put_code/1, put_code/2, nl/1, nl/0
• Byte input/output
  • get_byte/2, get_byte/1
  • peek_byte/2, peek_byte/1
  • unget_byte/2, unget_byte/1
  • put_byte/2, put_byte/1
• Term input/output
  • read_term/3, read_term/2, read/2, read/1
  • read_atom/2, read_atom/1, read_integer/2, read_integer/1,
    read_number/2, read_number/1
  • read_token/2, read_token/1
  • syntax_error_info/4
  • last_read_start_line_column/2
  • write_term/3, write_term/2, write/2, write/1, writeq/2, writeq/1,
    write_canonical/2, write_canonical/1, display/2, display/1, print/2,
    print/1
  • format/3, format/2
  • portray_clause/2, portray_clause/1
  • get_print_stream/1
  • op/3
  • current_op/3
  • char_conversion/2
  • current_char_conversion/2
• Input/output from/to constant terms
  • read_term_from_atom/3, read_from_atom/2, read_token_from_atom/2
  • read_term_from_chars/3, read_from_chars/2, read_token_from_chars/2
  • read_term_from_codes/3, read_from_codes/2, read_token_from_codes/2
  • write_term_to_atom/3, write_to_atom/2, writeq_to_atom/2,
    write_canonical_to_atom/2, display_to_atom/2, print_to_atom/2,
    format_to_atom/3
  • write_term_to_chars/3, write_to_chars/2, writeq_to_chars/2,
    write_canonical_to_chars/2, display_to_chars/2, print_to_chars/2,
    format_to_chars/3
  • write_term_to_codes/3, write_to_codes/2, writeq_to_codes/2,
    write_canonical_to_codes/2, display_to_codes/2, print_to_codes/2,
    format_to_codes/3
• DEC-10 compatibility input/output
  • Introduction
  • see/1, tell/1, append/1
  • seeing/1, telling/1
  • seen/0, told/0
  • get0/1, get/1, skip/1
  • put/1, tab/1
• Term expansion
  • Definite clause grammars
  • expand_term/2, term_expansion/2
  • phrase/3, phrase/2
• Logic, control and exceptions
  • abort/0, stop/0, top_level/0, break/0, halt/1, halt/0
  • once/1, (\+)/1 - not provable, call_with_args/1-11, call/2
  • repeat/0
  • for/3
• Atomic term processing
  • atom_length/2
  • atom_concat/3
  • sub_atom/5
  • char_code/2
  • lower_upper/2
  • atom_chars/2, atom_codes/2
  • number_atom/2, number_chars/2, number_codes/2
  • name/2
  • atom_hash/2
  • new_atom/3, new_atom/2, new_atom/1
  • current_atom/1
  • atom_property/2
• List processing
  • append/3
  • member/2, memberchk/2
  • reverse/2
  • delete/3, select/3
  • permutation/2
  • prefix/2, suffix/2
  • sublist/2
  • last/2
  • length/2
  • nth/3
  • max_list/2, min_list/2, sum_list/2
  • sort/2, sort0/2, keysort/2 sort/1, sort0/1, keysort/1
• Global variables
  • g_assign/2, g_assignb/2, g_link/2
  • g_read/2
  • g_array_size/2
  • Examples
• Prolog state
  • set_prolog_flag/2
  • current_prolog_flag/2
  • set_bip_name/2
  • current_bip_name/2
  • write_pl_state_file/1, read_pl_state_file/1
• Program state
  • consult/1, '.'/2 - program consult
  • load/1
  • listing/1, listing/0
• System statistics
  • statistics/0, statistics/2
  • user_time/1, system_time/1, cpu_time/1, real_time/1
• Random number generator
  • set_seed/1, randomize/0
  • get_seed/1
  • random/1
  • random/3
• File name processing
  • absolute_file_name/2
  • decompose_file_name/4
  • prolog_file_name/2
• Operating system interface
  • argument_counter/1
  • argument_value/2
  • argument_list/1
  • environ/2
  • make_directory/1, delete_directory/1, change_directory/1
  • working_directory/1
  • directory_files/2
  • rename_file/2
  • delete_file/1, unlink/1
  • file_permission/2, file_exists/1
  • file_property/2
  • temporary_name/2
  • temporary_file/3
  • date_time/1
  • host_name/1
  • os_version/1
  • architecture/1
  • shell/2, shell/1, shell/0
  • system/2, system/1
  • spawn/3, spawn/2
  • popen/3
  • exec/5, exec/4
  • wait/2
  • prolog_pid/1
  • send_signal/2
  • sleep/1
  • select/5
• Sockets input/output
  • Introduction
  • socket/2
  • socket_close/1
  • socket_bind/2
  • socket_connect/4
  • socket_listen/2
  • socket_accept/4, socket_accept/3
  • hostname_address/2
• Linedit management
  • get_linedit_prompt/1
  • set_linedit_prompt/1
  • add_linedit_completion/1
  • find_linedit_completion/2

---

Copyright (C) 1999,2000 Daniel Diaz

Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.

More about the copyright

---