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78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
/******************************************************************************
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* Top contributors (to current version):
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* Aina Niemetz
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*
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* This file is part of the cvc5 project.
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*
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* Copyright (c) 2009-2025 by the authors listed in the file AUTHORS
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* in the top-level source directory and their institutional affiliations.
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* All rights reserved. See the file COPYING in the top-level source
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* directory for licensing information.
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* ****************************************************************************
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*
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* A simple demonstration of reasoning about sequences via the C API.
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*/
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#include <cvc5/c/cvc5.h>
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#include <stdio.h>
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int main()
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{
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Cvc5TermManager* tm = cvc5_term_manager_new();
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Cvc5* slv = cvc5_new(tm);
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// Set the logic
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cvc5_set_logic(slv, "QF_SLIA");
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// Produce models
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cvc5_set_option(slv, "produce-models", "true");
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// The option strings-exp is needed
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cvc5_set_option(slv, "strings-exp", "true");
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// Sequence sort
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Cvc5Sort int_seq = cvc5_mk_sequence_sort(tm, cvc5_get_integer_sort(tm));
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// Sequence variables
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Cvc5Term x = cvc5_mk_const(tm, int_seq, "x");
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Cvc5Term y = cvc5_mk_const(tm, int_seq, "y");
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// Empty sequence
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Cvc5Term empty = cvc5_mk_empty_sequence(tm, cvc5_get_integer_sort(tm));
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// Sequence concatenation: x.y.empty
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Cvc5Term args3[3] = {x, y, empty};
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Cvc5Term concat = cvc5_mk_term(tm, CVC5_KIND_SEQ_CONCAT, 3, args3);
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// Sequence length: |x.y.empty|
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Cvc5Term args1[1] = {concat};
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Cvc5Term concat_len = cvc5_mk_term(tm, CVC5_KIND_SEQ_LENGTH, 1, args1);
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// |x.y.empty| > 1
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Cvc5Term args2[2] = {concat_len, cvc5_mk_integer_int64(tm, 1)};
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Cvc5Term formula1 = cvc5_mk_term(tm, CVC5_KIND_GT, 2, args2);
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// Sequence unit: seq(1)
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args1[0] = cvc5_mk_integer_int64(tm, 1);
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Cvc5Term unit = cvc5_mk_term(tm, CVC5_KIND_SEQ_UNIT, 1, args1);
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// x = seq(1)
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args2[0] = x;
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args2[1] = unit;
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Cvc5Term formula2 = cvc5_mk_term(tm, CVC5_KIND_EQUAL, 2, args2);
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// Make a query
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args2[0] = formula1;
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args2[1] = formula2;
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Cvc5Term q = cvc5_mk_term(tm, CVC5_KIND_AND, 2, args2);
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// check sat
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Cvc5Term assumptions[1] = {q};
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Cvc5Result result = cvc5_check_sat_assuming(slv, 1, assumptions);
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printf("cvc5 reports: %s is %s.\n",
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cvc5_term_to_string(q),
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cvc5_result_to_string(result));
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if (cvc5_result_is_sat(result))
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{
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printf(" x = %s\n", cvc5_term_to_string(cvc5_get_value(slv, x)));
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printf(" y = %s\n", cvc5_term_to_string(cvc5_get_value(slv, y)));
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}
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cvc5_delete(slv);
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cvc5_term_manager_delete(tm);
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}
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