I'm trying to create a Qt application and I need a math expression evaluator to evaluate things like this e.g. (4+5)*2-9/3. I included the .hpp file of this library (http://www.partow.net/programming/exprtk/) to my project in the Qt Creator and tried to launch the following example of code:
#include <cstdio>
#include <string>
#include "exprtk.hpp"
int main()
{
typedef exprtk::expression<double> expression_t;
typedef exprtk::parser<double> parser_t;
std::string expression_string = "3 + sqrt(5) + pow(3,2) + log(5)";
expression_t expression;
parser_t parser;
if (parser.compile(expression_string,expression))
{
double result = expression.value();
printf("Result: %19.15\n",result);
}
else
printf("Error in expression\n.");
return 0;
}
When I try to compile and run it I get the following output:
debug\main.o:-1: error: too many sections (62303)
What could be the problem?
Using just pure Qt you can do something like this:
QString expression_string("3 + Math.sqrt(5) + Math.pow(3,2) + Math.log(5)");
QScriptEngine expression;
double my_val=expression.evaluate(expression_string).toNumber();