(original) (raw)

/* ************************************************************** * C++ Mathematical Expression Toolkit Library * * * * ExprTk Summation of Prime Factors * * 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 sum_of_primes() { typedef exprtk::symbol_table symbol_table_t; typedef exprtk::expression expression_t; typedef exprtk::parser parser_t; typedef exprtk::function_compositor compositor_t; typedef typename compositor_t::function function_t; symbol_table_t symbol_table; compositor_t compositor(symbol_table); // define function: sum_of_primes(z) compositor.add( function_t("sum_of_primes") .var("z") .expression( " var i := 2; " " var total := 0; " " while (z > 1) " " { " " if (0 == (z % i)) " " { " " total += i; " " z /= i; " " } " " else " " i += 1; " " }; " " total; ")); exprtk::rtl::io::println println; symbol_table.add_function("println",println); const std::string sum_of_prime_factors_program = " for (var i := 1; i <= 100; i += 1) " " { " " println(i, sum_of_primes(i)); " " } "; expression_t expression; expression.register_symbol_table(symbol_table); parser_t parser; parser.compile(sum_of_prime_factors_program,expression); expression.value(); } int main() { sum_of_primes(); return 0; }