Calc++ Top Level (Bison 3.8.1)

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#include <iostream>
#include "driver.hh"

int
main (int argc, char *argv[])
{
 int res = 0;
 driver drv;
 for (int i = 1; i < argc; ++i)
 if (argv[i] == std::string ("-p"))
 drv.trace_parsing = true;
 else if (argv[i] == std::string ("-s"))
 drv.trace_scanning = true;
 else if (!drv.parse (argv[i]))
 std::cout << drv.result << '\n';
 else
 res = 1;
 return res;
}