#include <itpp/itcomm.h>using namespace itpp;//These lines are needed for use of cout and endlusing std::cout;using std::endl;int main(){  //Scalars  int N;  double N0;  //Vectors  bvec bits, dec_bits;  vec symbols, rec;  //Classes  BPSK bpsk;  //The BPSK modulator/debodulator class  BERC berc;  //The Bit Error Rate Counter class  //Init  N = 500000; //The number of bits to simulate  N0 = 1;     //0 dB SNR  //Randomize the random number generator  RNG_randomize();  //Generate the bits:  bits = randb(N);  //Do the BPSK modulation  bpsk.modulate_bits(bits, symbols);  //Add the AWGN  rec = symbols + sqrt(N0/2)* randn(N);  //Decode the received bits  bpsk.demodulate_bits(rec, dec_bits);  //Count the number of errors  berc.count(bits,dec_bits);  //Print the results  cout << "There were " << berc.get_errors() << " received bits in error." << endl;  cout << "There were " << berc.get_corrects() << " correctly received bits." << endl;  cout << "The error probability was " << berc.get_errorrate() << endl;  cout << "The theoretical error probability is " << 0.5*erfc(1.0) << endl;  //Exit program:  return 0;}