Home >Backend Development >C++ >How can I efficiently evaluate custom mathematical expressions in C ?

How can I efficiently evaluate custom mathematical expressions in C ?

Patricia Arquette
Patricia ArquetteOriginal
2024-11-01 10:28:30216browse

How can I efficiently evaluate custom mathematical expressions in C  ?

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>

The above is the detailed content of How can I efficiently evaluate custom mathematical expressions in C ?. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn