main.cc
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	/* -------------------------------------------------------------------------- */
	#include <cstdlib>
	#include <cmath>
	#include <iostream>
	#include <iomanip>
	/* -------------------------------------------------------------------------- */

	int main(int argc, char ** argv){

	unsigned long maxiter = atof(argv[1]);
	float pi = 0.;
	float pi2 = 0.;

	for (unsigned long k = 1 ; k < maxiter ; ++k){
	pi += 1./(1.kk);

	unsigned long k2 = maxiter-k;
	pi2 += 1./(1.k2k2);


	}
	pi *= 6.;
	pi2 *= 6.;

	std::cout << std::scientific << std::setprecision(15)
	<< pi << " " << pi2 << " " << M_PI*M_PI
	<< " " << pi - M_PIM_PI << " " << pi2 - M_PIM_PI << std::endl;

	return EXIT_SUCCESS;
	}