exprtk_prime_sieve.cpp File Reference

#include <cstdio>
#include <string>
#include "exprtk.hpp"

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Functions
template<typename T>
void	sieve_of_eratosthenes ()
int	main ()

Function Documentation

main()

int main

(

)

Definition at line 71 of file exprtk_prime_sieve.cpp.

{
   sieve_of_eratosthenes<double>();
   return 0;
}

References sieve_of_eratosthenes().

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sieve_of_eratosthenes()

template<typename T>

void sieve_of_eratosthenes

(

)

Definition at line 27 of file exprtk_prime_sieve.cpp.

{
   typedef exprtk::expression<T> expression_t;
   typedef exprtk::parser<T>     parser_t;
 
   const std::string sieve_of_eratosthenes_program =
      " var sieve[10^8] := [false];                   "
      " var m := trunc(sqrt(sieve[]));                "
      "                                               "
      " sieve[0] := true;                             "
      " sieve[1] := true;                             "
      "                                               "
      " for (var i := 0; i <= m; i += 1)              "
      " {                                             "
      "    if (false == sieve[i])                     "
      "    {                                          "
      "       for (var j := i^2; j < sieve[]; j += i) "
      "       {                                       "
      "          sieve[j] := true;                    "
      "       }                                       "
      "    }                                          "
      " };                                            "
      "                                               "
      " var prime_count := sieve[] - sum(sieve);      "
      "                                               "
      " prime_count == 5761455;                       ";
 
   expression_t expression;
 
   parser_t parser;
   parser.compile(sieve_of_eratosthenes_program,expression);
 
   exprtk::timer timer;
   timer.start();
 
   const T result = expression.value();
 
   timer.stop();
 
   printf("Result: %8.3f\n",result);
 
   printf("Total time: %8.3fsec\n",timer.time());
}

References exprtk::parser< T >::compile(), exprtk::timer::start(), exprtk::timer::stop(), and exprtk::timer::time().

Referenced by main().

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