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/* ************************************************************** * C++ Mathematical Expression Toolkit Library * * * * ExprTk Pythagorean Triples * * Author: Arash Partow (1999-2024) * * URL: https://www.partow.net/programming/exprtk/index.html * * * * Copyright notice: * * Free use of the Mathematical Expression Toolkit Library is * * permitted under the guidelines and in accordance with the * * most current version of the MIT License. * * https://www.opensource.org/licenses/MIT * * SPDX-License-Identifier: MIT * * * ************************************************************** */ #include #include #include "exprtk.hpp" template void exprtk_pythagorean_triples() { typedef exprtk::symbol_table symbol_table_t; typedef exprtk::expression expression_t; typedef exprtk::parser parser_t; const std::string pythagorean_triples_program = " const var num_triples := 1000; " " var triple_count := 0; " " var n := 2; " " " " while (true) " " { " " for (var i := 1; i < n; i += 1) " " { " " var a := n^2 - i^2; " " var b := 2 * n * i; " " var c := n^2 + i^2; " " " " if (a > b) a <=> b; " " if (b > c) b <=> c; " " if (a > b) a <=> b; " " " " println('(', a ,',', b ,',', c ,')'); " " " " if ((triple_count += 1) >= num_triples) " " { " " return []; " " }; " " }; " " " " n += 1; " " } "; exprtk::rtl::io::println println; symbol_table_t symbol_table; symbol_table.add_function ("println", println); expression_t expression; expression.register_symbol_table(symbol_table); parser_t parser; parser.compile(pythagorean_triples_program, expression); expression.value(); } int main() { exprtk_pythagorean_triples(); return 0; }