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Evaluating Mathematical Expressions in C
Evaluating custom mathematical expressions in C can be a challenging task. Embedding Python into C is one potential solution, but there are more efficient and native options available.
Utilizing the ExprTk Library
One of the most effective approaches is the ExprTk library. This library provides a convenient and powerful expression parser and evaluator. Here's a simple example using ExprTk:
<code class="cpp">#include <cstdio> #include <string> #include "exprtk.hpp" int main() { // Define expression types typedef exprtk::expression<double> expression_t; typedef exprtk::parser<double> parser_t; // Expression string std::string expression_string = "3 + sqrt(5) + pow(3,2) + log(5)"; // Expression and parser objects expression_t expression; parser_t parser; // Compile expression if (parser.compile(expression_string, expression)) { // Evaluate and print result double result = expression.value(); printf("Result: %19.15\n", result); } else { printf("Error in expression\n."); } return 0; }</code>
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