text: #include <stdio.h>
  #include <stdlib.h>
  
  #include <matcalc/visitor.h>
  #include <matcalc/pi_arctan.h>
  
  main(const argc, char *argv[]) {
  	if(argc > 3)
  		return EXIT_FAILURE;
  	const
  		NO_ITERATIONS = (argc >= 2) ? atoi(argv[1]) : (1 << 18),
  		PRECISION = (argc == 3) ? atoi(argv[2]) : 20000;
  	mpfr_t pi;
  	calc_pi_arctan(pi, NO_ITERATIONS, PRECISION);
    puts("here");fflush(stdout);
  	mpfr_printer(&pi);
  	mpfr_clear(pi);
  }
  