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71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
/*
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**************************************************************
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* C++ Mathematical Expression Toolkit Library *
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* *
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* Simple Example 7 *
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* Author: Arash Partow (1999-2017) *
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* URL: http://www.partow.net/programming/exprtk/index.html *
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* *
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* Copyright notice: *
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* Free use of the Mathematical Expression Toolkit Library is *
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* permitted under the guidelines and in accordance with the *
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* most current version of the MIT License. *
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* http://www.opensource.org/licenses/MIT *
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* *
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**************************************************************
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*/
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#include <cstdio>
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#include <string>
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#include "exprtk.hpp"
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template <typename T>
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void logic()
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{
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typedef exprtk::symbol_table<T> symbol_table_t;
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typedef exprtk::expression<T> expression_t;
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typedef exprtk::parser<T> parser_t;
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std::string expression_string = "not(A and B) or C";
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symbol_table_t symbol_table;
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symbol_table.create_variable("A");
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symbol_table.create_variable("B");
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symbol_table.create_variable("C");
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expression_t expression;
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expression.register_symbol_table(symbol_table);
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parser_t parser;
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parser.compile(expression_string,expression);
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printf(" # | A | B | C | %s\n"
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"---+---+---+---+-%s\n",
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expression_string.c_str(),
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std::string(expression_string.size(),'-').c_str());
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for (int i = 0; i < 8; ++i)
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{
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symbol_table.get_variable("A")->ref() = T((i & 0x01) ? 1 : 0);
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symbol_table.get_variable("B")->ref() = T((i & 0x02) ? 1 : 0);
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symbol_table.get_variable("C")->ref() = T((i & 0x04) ? 1 : 0);
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int result = static_cast<int>(expression.value());
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printf(" %d | %d | %d | %d | %d \n",
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i,
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static_cast<int>(symbol_table.get_variable("A")->value()),
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static_cast<int>(symbol_table.get_variable("B")->value()),
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static_cast<int>(symbol_table.get_variable("C")->value()),
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result);
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}
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}
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int main()
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{
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logic<double>();
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return 0;
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}
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